Think Different: Objective-C for the .NET developer
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One of the major stumbling blocks for new iOS developers is dealing with Objective-C. The fear of Objective-C has led some to avoid it completely and revert to Ruby Motion, Xamarin, Phonegap or Titanium. While there are valid reasons to use each of these frameworks, the fear of Objective-C shouldn’t be one of them. We’ll walk you through some of the more difficult concepts of Objective-C and compare them to concepts you might be familiar with from using .NET or Java.
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
ここ3000字までしか入らないけどタイトルの方がたくさん文字入ると思います。
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Think Different: Objective-C for the .NET developer
- 1. Objective-C for the .NET (Or Java) developer It’s not as scary as it looks, I promise... @shawnprice84
- 2. Common Complaints Too verbose Unmanaged memory Complicated syntax Lack of type safety Unfriendly community
- 3. Classes and Objects Object-oriented, dynamic language (no type safety) No Namespaces, Prefix class names with 2-3 letters to help differentiate your classes (NSObject)
- 4. Interfaces and Implementations An interface Provides a contract, but for a single implementation (not reusable)
- 5. Properties Autosynthesized vs. Autoimplemented properties Atomic vs nonatomic Strong vs Weak references Accessing a property with dot (“.”) notation uses the synthesized accessor methods
- 6. Methods + indicates a class method (static), indicates an instance method Each parameter should have a description of what the property indicates, the type and the parameter name Call a selector (method) on nil will do nothing (no exception thrown)
- 8. Object Initialization alloc - allocates the memory for an object init - initializes the attributes Custom initializers are the equivalent of custom constructors
- 9. Delegates Not just method stubs (like .NET) - full objects with multiple methods Interact with existing classes Respond to events and requests for information
- 10. Automatic Reference Counting(ARC) Provides ultra-simple memory management Keeps track of active references to an object When an object’s reference count reaches 0 it’s removed from memory immediately (unlike GC) Only real danger is a circular reference
- 11. Avoid a circular reference Delegates should always be weak (or unsafe_unretained) and of type “id” If a block is stored in a strongly held property then only pass in weak references to ivars and self
- 12. Categories Similar to extension methods in C# .NET Adds methods to existing classes without the need to create a new object type
- 13. Class Inheritance Works almost exactly like .NET class inheritance Used much less frequently in Objective-C. Categories and Delegates are preferred
- 14. Protocols Closest thing to interfaces in Objective-C Defines a contract that an object must adhere to Can also have optional methods Declare an object adheres to a protocol using <ProtocolName>
- 15. Collections NSArray, NSSet, NSDictionary, NSHashTable Collections are immutable unless specified (NSMutableArray) Objective-C collections can’t store primitive types (NSNumber, NSString, NSValue) To store primitive types you can use a Cstyle array
- 16. Blocks Chunks of code that can be passed as an argument Similar to anonymous methods
- 17. Blocks cont... Declaring a block reference Invoke the block Be careful to check if block is null
- 18. In Conclusion Don’t be afraid to try it Most of the hatred for Objective-c is based on outdated ideas (or poorly written code)