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    4 whats-new-in-ios7-m4-multitasking-slides 4 whats-new-in-ios7-m4-multitasking-slides Presentation Transcript

    • What’s new in iOS7 Networking and Multi-tasking Jon Flanders @jonflanders Tuesday, September 3, 13
    • What you will learn... Tuesday, September 3, 13
    • What you will learn... § All about the new options for multi-tasking and background execution Tuesday, September 3, 13
    • Background Tasks Tuesday, September 3, 13
    • Background Tasks § Ever since iOS4, apps could request extra time to execute after being sent to the background Tuesday, September 3, 13
    • Background Tasks § Ever since iOS4, apps could request extra time to execute after being sent to the background o 15 minutes of execution time Tuesday, September 3, 13
    • Background Tasks § Ever since iOS4, apps could request extra time to execute after being sent to the background o 15 minutes of execution time § This API remains in iOS7, but you may not need to use it (more on this later) Tuesday, September 3, 13
    • Background Tasks § Ever since iOS4, apps could request extra time to execute after being sent to the background o 15 minutes of execution time § This API remains in iOS7, but you may not need to use it (more on this later) § If you do use it, the execution semantics have changed Tuesday, September 3, 13
    • Background Tasks § Ever since iOS4, apps could request extra time to execute after being sent to the background o 15 minutes of execution time § This API remains in iOS7, but you may not need to use it (more on this later) § If you do use it, the execution semantics have changed o If user locked screen in iOS6, the background task would keep the phone awake Tuesday, September 3, 13
    • Background Tasks § Ever since iOS4, apps could request extra time to execute after being sent to the background o 15 minutes of execution time § This API remains in iOS7, but you may not need to use it (more on this later) § If you do use it, the execution semantics have changed o o If user locked screen in iOS6, the background task would keep the phone awake iOS7 puts the app to sleep; the app will get a time-slice once the phone wakes up Tuesday, September 3, 13
    • Background Tasks § Ever since iOS4, apps could request extra time to execute after being sent to the background o 15 minutes of execution time § This API remains in iOS7, but you may not need to use it (more on this later) § If you do use it, the execution semantics have changed o o o If user locked screen in iOS6, the background task would keep the phone awake iOS7 puts the app to sleep; the app will get a time-slice once the phone wakes up Execution time not guaranteed to be contiguous Tuesday, September 3, 13
    • New App Switcher Tuesday, September 3, 13
    • New App Switcher § One of the major changes in the OS Tuesday, September 3, 13
    • New App Switcher § One of the major changes in the OS § User can swipe up on app snapshot to kill the app Tuesday, September 3, 13
    • New App Switcher § One of the major changes in the OS § User can swipe up on app snapshot to kill the app o Unlike in iOS6, this also kills background execution Tuesday, September 3, 13
    • New APIs Tuesday, September 3, 13
    • New APIs § Background Fetch Tuesday, September 3, 13
    • New APIs § Background Fetch § Remote Notifications Tuesday, September 3, 13
    • New APIs § Background Fetch § Remote Notifications § Background Transfer Service Tuesday, September 3, 13
    • Background Fetch Tuesday, September 3, 13
    • Background Fetch § When an app opens, typically it shows fresh data Tuesday, September 3, 13
    • Background Fetch § When an app opens, typically it shows fresh data § When an app is brought to the foreground after being in the background, generally the first thing most apps do is refresh their data Tuesday, September 3, 13
    • Background Fetch § When an app opens, typically it shows fresh data § When an app is brought to the foreground after being in the background, generally the first thing most apps do is refresh their data o But update happens after the user is already in the app, so the user sees a transition Tuesday, September 3, 13
    • Background Fetch § When an app opens, typically it shows fresh data § When an app is brought to the foreground after being in the background, generally the first thing most apps do is refresh their data o But update happens after the user is already in the app, so the user sees a transition § Background Fetch enables an app to update its data in the background Tuesday, September 3, 13
    • Background Fetch § When an app opens, typically it shows fresh data § When an app is brought to the foreground after being in the background, generally the first thing most apps do is refresh their data o But update happens after the user is already in the app, so the user sees a transition § Background Fetch enables an app to update its data in the background o If an app is in the background, it will be assigned a time-slice Tuesday, September 3, 13
    • Background Fetch § When an app opens, typically it shows fresh data § When an app is brought to the foreground after being in the background, generally the first thing most apps do is refresh their data o But update happens after the user is already in the app, so the user sees a transition § Background Fetch enables an app to update its data in the background o o If an app is in the background, it will be assigned a time-slice If an app isn’t running, it will be started in the background and then assigned a timeslice Tuesday, September 3, 13
    • Background Fetch § When an app opens, typically it shows fresh data § When an app is brought to the foreground after being in the background, generally the first thing most apps do is refresh their data o But update happens after the user is already in the app, so the user sees a transition § Background Fetch enables an app to update its data in the background o o o If an app is in the background, it will be assigned a time-slice If an app isn’t running, it will be started in the background and then assigned a timeslice When and how often the app is assigned a time-slice is controlled by the OS Tuesday, September 3, 13
    • Background Fetch API Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode § Set the background fetch interval range on your Application object Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode § Set the background fetch interval range on your Application object o No repeating interval Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode § Set the background fetch interval range on your Application object o o No repeating interval Time-slice assignment is managed by the OS, the range is set by the developer Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode § Set the background fetch interval range on your Application object o o No repeating interval Time-slice assignment is managed by the OS, the range is set by the developer § New delegate callback Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode § Set the background fetch interval range on your Application object o o No repeating interval Time-slice assignment is managed by the OS, the range is set by the developer § New delegate callback o performFetchWithCompletionHandler Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode § Set the background fetch interval range on your Application object o o No repeating interval Time-slice assignment is managed by the OS, the range is set by the developer § New delegate callback o o performFetchWithCompletionHandler Do your work: call the completion handler when you are done Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode § Set the background fetch interval range on your Application object o o No repeating interval Time-slice assignment is managed by the OS, the range is set by the developer § New delegate callback o o o performFetchWithCompletionHandler Do your work: call the completion handler when you are done After the completion handler is called, if you have new data, it will create a new snapshot of your app Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode § Set the background fetch interval range on your Application object o o No repeating interval Time-slice assignment is managed by the OS, the range is set by the developer § New delegate callback o o o performFetchWithCompletionHandler Do your work: call the completion handler when you are done After the completion handler is called, if you have new data, it will create a new snapshot of your app § Update UI for App Switcher Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode § Set the background fetch interval range on your Application object o o No repeating interval Time-slice assignment is managed by the OS, the range is set by the developer § New delegate callback o o o performFetchWithCompletionHandler Do your work: call the completion handler when you are done After the completion handler is called, if you have new data, it will create a new snapshot of your app § Update UI for App Switcher § You can test this via debug properties Tuesday, September 3, 13
    • Background Fetch API § Set the UIBackgroundModes value in the Info.plist to “fetch” o This can also be set this via the new Capabilities page in Xcode § Set the background fetch interval range on your Application object o o No repeating interval Time-slice assignment is managed by the OS, the range is set by the developer § New delegate callback o o o performFetchWithCompletionHandler Do your work: call the completion handler when you are done After the completion handler is called, if you have new data, it will create a new snapshot of your app § Update UI for App Switcher § You can test this via debug properties o Also on Debug menu Tuesday, September 3, 13
    • Remote Notifications Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) § Often sent to notify user of new data Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) § Often sent to notify user of new data o User is notified via alert or popup Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) § Often sent to notify user of new data o o User is notified via alert or popup If the user clicked on UI, the app was either brought to foreground or started Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) § Often sent to notify user of new data o o o User is notified via alert or popup If the user clicked on UI, the app was either brought to foreground or started Race condition: what if app can’t show new data yet because new data can’t even start to be retrieved until app is in the foreground Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) § Often sent to notify user of new data o o o User is notified via alert or popup If the user clicked on UI, the app was either brought to foreground or started Race condition: what if app can’t show new data yet because new data can’t even start to be retrieved until app is in the foreground § iOS7 enables you to send a notification with a new flag Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) § Often sent to notify user of new data o o o User is notified via alert or popup If the user clicked on UI, the app was either brought to foreground or started Race condition: what if app can’t show new data yet because new data can’t even start to be retrieved until app is in the foreground § iOS7 enables you to send a notification with a new flag o content-available : 1 Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) § Often sent to notify user of new data o o o User is notified via alert or popup If the user clicked on UI, the app was either brought to foreground or started Race condition: what if app can’t show new data yet because new data can’t even start to be retrieved until app is in the foreground § iOS7 enables you to send a notification with a new flag o o content-available : 1 When set, the app gets executed before the user gets the notification Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) § Often sent to notify user of new data o o o User is notified via alert or popup If the user clicked on UI, the app was either brought to foreground or started Race condition: what if app can’t show new data yet because new data can’t even start to be retrieved until app is in the foreground § iOS7 enables you to send a notification with a new flag o o o content-available : 1 When set, the app gets executed before the user gets the notification Hopefully you can get that new data before the user clicks the alert to bring the app to the foreground Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) § Often sent to notify user of new data o o o User is notified via alert or popup If the user clicked on UI, the app was either brought to foreground or started Race condition: what if app can’t show new data yet because new data can’t even start to be retrieved until app is in the foreground § iOS7 enables you to send a notification with a new flag o o o content-available : 1 When set, the app gets executed before the user gets the notification Hopefully you can get that new data before the user clicks the alert to bring the app to the foreground § Send content-available:1 without an alert in the payload of the notification Tuesday, September 3, 13
    • Remote Notifications § Since iOS4, notifications could be sent through Apple’s Push Notification Service (APNS) § Often sent to notify user of new data o o o User is notified via alert or popup If the user clicked on UI, the app was either brought to foreground or started Race condition: what if app can’t show new data yet because new data can’t even start to be retrieved until app is in the foreground § iOS7 enables you to send a notification with a new flag o o o content-available : 1 When set, the app gets executed before the user gets the notification Hopefully you can get that new data before the user clicks the alert to bring the app to the foreground § Send content-available:1 without an alert in the payload of the notification o This becomes a silent notification and is delivered to the app in the background Tuesday, September 3, 13
    • Remote Notifications API Tuesday, September 3, 13
    • Remote Notifications API § Set UIBackgroundModes to remote-notification in Info.plist Tuesday, September 3, 13
    • Remote Notifications API § Set UIBackgroundModes to remote-notification in Info.plist o Or use new Capabilities UI in Xcode Tuesday, September 3, 13
    • Remote Notifications API § Set UIBackgroundModes to remote-notification in Info.plist o Or use new Capabilities UI in Xcode § Make sure to set content-available: 1 in the payload Tuesday, September 3, 13
    • Remote Notifications API § Set UIBackgroundModes to remote-notification in Info.plist o Or use new Capabilities UI in Xcode § Make sure to set content-available: 1 in the payload § The application:didReceiveRemoteNotification:fetchCompletionHandler is called with a non-null completion handler Tuesday, September 3, 13
    • Remote Notifications API § Set UIBackgroundModes to remote-notification in Info.plist o Or use new Capabilities UI in Xcode § Make sure to set content-available: 1 in the payload § The application:didReceiveRemoteNotification:fetchCompletionHandler is called with a non-null completion handler o Call the completion handler when you are done Tuesday, September 3, 13
    • Remote Notifications API § Set UIBackgroundModes to remote-notification in Info.plist o Or use new Capabilities UI in Xcode § Make sure to set content-available: 1 in the payload § The application:didReceiveRemoteNotification:fetchCompletionHandler is called with a non-null completion handler o o Call the completion handler when you are done Silent notifications will be rate-limited. APNS does the work to make sure that device isn’t overloaded – delayed but not rejected Tuesday, September 3, 13
    • Networking in the Background Tuesday, September 3, 13
    • Networking in the Background § Before iOS7, you might want to download or upload a resource after the your app has gone to the background Tuesday, September 3, 13
    • Networking in the Background § Before iOS7, you might want to download or upload a resource after the your app has gone to the background § Background Task API would give you a set time-slice Tuesday, September 3, 13
    • Networking in the Background § Before iOS7, you might want to download or upload a resource after the your app has gone to the background § Background Task API would give you a set time-slice o What if your operation took longer than the time allowed (i.e. a large resource like a video or image)? Tuesday, September 3, 13
    • Background Transfer Service (BTS) Tuesday, September 3, 13
    • Background Transfer Service (BTS) § iOS7 introduces the BTS Tuesday, September 3, 13
    • Background Transfer Service (BTS) § iOS7 introduces the BTS § You can offload network work to the BTS Tuesday, September 3, 13
    • Background Transfer Service (BTS) § iOS7 introduces the BTS § You can offload network work to the BTS § BTS will ensure that the work gets completed Tuesday, September 3, 13
    • Background Transfer Service (BTS) § iOS7 introduces the BTS § You can offload network work to the BTS § BTS will ensure that the work gets completed o Works even if your app is in the background or even if it is terminated Tuesday, September 3, 13
    • Background Transfer Service (BTS) § iOS7 introduces the BTS § You can offload network work to the BTS § BTS will ensure that the work gets completed o o Works even if your app is in the background or even if it is terminated If your app wakes up due to background fetch or notification, this is a great API to pair with it Tuesday, September 3, 13
    • Background Transfer Service (BTS) § iOS7 introduces the BTS § You can offload network work to the BTS § BTS will ensure that the work gets completed o o Works even if your app is in the background or even if it is terminated If your app wakes up due to background fetch or notification, this is a great API to pair with it § BTS manages battery life and data Tuesday, September 3, 13
    • Background Transfer Service (BTS) § iOS7 introduces the BTS § You can offload network work to the BTS § BTS will ensure that the work gets completed o o Works even if your app is in the background or even if it is terminated If your app wakes up due to background fetch or notification, this is a great API to pair with it § BTS manages battery life and data o Requests are classified as discretionary or non-discretionary Tuesday, September 3, 13
    • Background Transfer Service (BTS) § iOS7 introduces the BTS § You can offload network work to the BTS § BTS will ensure that the work gets completed o o Works even if your app is in the background or even if it is terminated If your app wakes up due to background fetch or notification, this is a great API to pair with it § BTS manages battery life and data o o Requests are classified as discretionary or non-discretionary Discretionary requests will only happen when on WI-FI Tuesday, September 3, 13
    • Background Transfer Service (BTS) § iOS7 introduces the BTS § You can offload network work to the BTS § BTS will ensure that the work gets completed o o Works even if your app is in the background or even if it is terminated If your app wakes up due to background fetch or notification, this is a great API to pair with it § BTS manages battery life and data o o o Requests are classified as discretionary or non-discretionary Discretionary requests will only happen when on WI-FI Requests from the background are automatically discretionary Tuesday, September 3, 13
    • Background Transfer Service (BTS) § iOS7 introduces the BTS § You can offload network work to the BTS § BTS will ensure that the work gets completed o o Works even if your app is in the background or even if it is terminated If your app wakes up due to background fetch or notification, this is a great API to pair with it § BTS manages battery life and data o o o o Requests are classified as discretionary or non-discretionary Discretionary requests will only happen when on WI-FI Requests from the background are automatically discretionary Requests from the foreground can request to be discretionary Tuesday, September 3, 13
    • NSURLSession Tuesday, September 3, 13
    • NSURLSession § New object in iOS7 Tuesday, September 3, 13
    • NSURLSession § New object in iOS7 § Subsumes the functionality of NSURLConnection Tuesday, September 3, 13
    • NSURLSession § New object in iOS7 § Subsumes the functionality of NSURLConnection o API is similar to NSURLConnection Tuesday, September 3, 13
    • NSURLSession § New object in iOS7 § Subsumes the functionality of NSURLConnection o API is similar to NSURLConnection § Adds more functionality than NSURLConnection Tuesday, September 3, 13
    • NSURLSession § New object in iOS7 § Subsumes the functionality of NSURLConnection o API is similar to NSURLConnection § Adds more functionality than NSURLConnection o Instance storage of credentials, cookies, and other state (vs. NSURLConnection’s global shared state). Tuesday, September 3, 13
    • NSURLSession § New object in iOS7 § Subsumes the functionality of NSURLConnection o API is similar to NSURLConnection § Adds more functionality than NSURLConnection o Instance storage of credentials, cookies, and other state (vs. NSURLConnection’s global shared state). § If your app goes to the background or even is terminated after you make a NSURLSession request, BTS service will still complete the request Tuesday, September 3, 13
    • NSURLSession § New object in iOS7 § Subsumes the functionality of NSURLConnection o API is similar to NSURLConnection § Adds more functionality than NSURLConnection o Instance storage of credentials, cookies, and other state (vs. NSURLConnection’s global shared state). § If your app goes to the background or even is terminated after you make a NSURLSession request, BTS service will still complete the request o Your app is started or woken up when request is finished and you have a chance to process Tuesday, September 3, 13
    • NSURLSession API Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Background configuration gets an identifier (string) to use later to retrieve from BTS Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Background configuration gets an identifier (string) to use later to retrieve from BTS § Implement to appropriate protocols Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Background configuration gets an identifier (string) to use later to retrieve from BTS § Implement to appropriate protocols o NSURLSessionDelegate for high-level events Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Background configuration gets an identifier (string) to use later to retrieve from BTS § Implement to appropriate protocols o o NSURLSessionDelegate for high-level events NSURLSessionTaskDelegate for data-level events Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Background configuration gets an identifier (string) to use later to retrieve from BTS § Implement to appropriate protocols o o NSURLSessionDelegate for high-level events NSURLSessionTaskDelegate for data-level events § NSURLSessionTask really replaces NSURLConnection Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Background configuration gets an identifier (string) to use later to retrieve from BTS § Implement to appropriate protocols o o NSURLSessionDelegate for high-level events NSURLSessionTaskDelegate for data-level events § NSURLSessionTask really replaces NSURLConnection o [resume] method to start task Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Background configuration gets an identifier (string) to use later to retrieve from BTS § Implement to appropriate protocols o o NSURLSessionDelegate for high-level events NSURLSessionTaskDelegate for data-level events § NSURLSessionTask really replaces NSURLConnection o o [resume] method to start task [cancel],[suspend],[resume] control methods Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Background configuration gets an identifier (string) to use later to retrieve from BTS § Implement to appropriate protocols o o NSURLSessionDelegate for high-level events NSURLSessionTaskDelegate for data-level events § NSURLSessionTask really replaces NSURLConnection o o o [resume] method to start task [cancel],[suspend],[resume] control methods Multiple sub-classes for different functions Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Background configuration gets an identifier (string) to use later to retrieve from BTS § Implement to appropriate protocols o o NSURLSessionDelegate for high-level events NSURLSessionTaskDelegate for data-level events § NSURLSessionTask really replaces NSURLConnection o o o [resume] method to start task [cancel],[suspend],[resume] control methods Multiple sub-classes for different functions § NSURLSession also has block-based convenience methods as well Tuesday, September 3, 13
    • NSURLSession API § To create an NSURLSession, you need an NSURLSessionConfiguration object o o Configuration object determines foreground/background execution, whether the request will use only wi-fi, etc. Background configuration gets an identifier (string) to use later to retrieve from BTS § Implement to appropriate protocols o o NSURLSessionDelegate for high-level events NSURLSessionTaskDelegate for data-level events § NSURLSessionTask really replaces NSURLConnection o o o [resume] method to start task [cancel],[suspend],[resume] control methods Multiple sub-classes for different functions § NSURLSession also has block-based convenience methods as well o Still need to call [resume] on task to kick off connection Tuesday, September 3, 13
    • Background Considerations Tuesday, September 3, 13
    • Background Considerations § Limited time Tuesday, September 3, 13
    • Background Considerations § Limited time o You still only get a limited time to execute in the background (less than 1 minute) Tuesday, September 3, 13
    • Background Considerations § Limited time o o You still only get a limited time to execute in the background (less than 1 minute) Make sure to call the completion handlers ALWAYS in less than 1 minute Tuesday, September 3, 13
    • Background Considerations § Limited time o o o You still only get a limited time to execute in the background (less than 1 minute) Make sure to call the completion handlers ALWAYS in less than 1 minute Use BTS to enhance the work you can do when called in the background Tuesday, September 3, 13
    • Background Considerations § Limited time o o o You still only get a limited time to execute in the background (less than 1 minute) Make sure to call the completion handlers ALWAYS in less than 1 minute Use BTS to enhance the work you can do when called in the background § User control Tuesday, September 3, 13
    • Background Considerations § Limited time o o o You still only get a limited time to execute in the background (less than 1 minute) Make sure to call the completion handlers ALWAYS in less than 1 minute Use BTS to enhance the work you can do when called in the background § User control o User can turn off or limit background fetch Tuesday, September 3, 13
    • Background Considerations § Limited time o o o You still only get a limited time to execute in the background (less than 1 minute) Make sure to call the completion handlers ALWAYS in less than 1 minute Use BTS to enhance the work you can do when called in the background § User control o User can turn off or limit background fetch § Data Protection Tuesday, September 3, 13
    • Background Considerations § Limited time o o o You still only get a limited time to execute in the background (less than 1 minute) Make sure to call the completion handlers ALWAYS in less than 1 minute Use BTS to enhance the work you can do when called in the background § User control o User can turn off or limit background fetch § Data Protection o If you use the recommended levels of data protection, you won’t be able to access files, keychain, or sqlite DBs when running in the background Tuesday, September 3, 13
    • Background Considerations § Limited time o o o You still only get a limited time to execute in the background (less than 1 minute) Make sure to call the completion handlers ALWAYS in less than 1 minute Use BTS to enhance the work you can do when called in the background § User control o User can turn off or limit background fetch § Data Protection o o If you use the recommended levels of data protection, you won’t be able to access files, keychain, or sqlite DBs when running in the background If you need credentials in the background, to lower risk, consider a token that expires in a short amount of time Tuesday, September 3, 13
    • Summary Tuesday, September 3, 13
    • Summary § The new background execution features help your app seem to the user to be running all the time Tuesday, September 3, 13
    • Summary § The new background execution features help your app seem to the user to be running all the time § The new NSURLSession and BTS make foreground networking code simpler and background networking code possible Tuesday, September 3, 13