iOS UI Debugging

iOSUIDebugging
by David Olesch
December 2016 - Austin iPhone Developer Group Meetup

WhatisDebugging?

iOSUIDebugging?

Debugbylogging
In Objective-C
object.someVariable = @"Hello World";
NSLog(object.someVariable); // Logs "Hello World"
In Swi!
object.someVariable = "Hello World"
print(object.someVariable) // Logs "Hello World"

lldbtherealiOSappdebugger
(lldb) po object
<NSObject: 0x7fe572d8df70; someVariable = "Hello World">
(lldb) po [object someVariable]
Hello World
(lldb) p [object someVariable]
(NSString *) $0 = 0x000d9080 @"Hello World"

FacebookChisel

R.I.P.pviews
2014-2016

LongLivepvc
(lldb)pvc
.

LongLivepvc
(lldb)pvc
<UINavigationController 0x7fe57400fa00>, state: appeared, view: <UILayoutContainerView 0x7fe575013420>
| <DOTriviaContainerViewController 0x7fe572f21c60>, state: appeared, view: <UIView 0x7fe572cd3ed0>
| | <DOLevelCategoriesViewController 0x7fe572f74b50>, state: appeared, view: <UICollectionViewControllerWrapperView 0x7fe572f48380>

LongLivepvc
(lldb)pvc
(lldb)po (int)[[0x7fe572f74b50 items] count]

LongLivepvc
(lldb)pvc
(lldb)po (int)[[0x7fe572f74b50 items] count]
13

LongLivevisualize

LongLiveshow/hide

LongLivecaflush
(lldb)pvc
.

LongLivecaflush
(lldb)pvc

LongLivecaflush
(lldb)pvc
(lldb) e id $vc = [UIViewController new]
(lldb) e (void)[$vc setTitle:@"Debug View Controller"]
(lldb) e (void)[0x7fe57400fa00 pushViewContoller:$vc animated:YES]

LongLivecaflush
(lldb)pvc
(lldb) e id $vc = [UIViewController new]
(lldb) e (void)[$vc setTitle:@"Debug View Controller"]
(lldb) e (void)[0x7fe57400fa00 pushViewContoller:$vc animated:YES]
(lldb) caflush

LongLivewivar

LongLivepresponder
(lldb) presponder button
.

LongLivepresponder
(lldb) presponder button
<UIButton: 0x7ff91275b4c0; frame = (12 144; 170 44); opaque = NO; autoresize = RM+BM; tag = 3; layer = <CALayer: 0x7ff912427680>>
| <UIView: 0x7ff9124f5650; frame = (0 0; 200 200); gestureRecognizers = <NSArray: 0x7ff914846c20>; layer = <CALayer: 0x7ff914935e40>>
| | <UICollectionViewCell: 0x7ff914932660; frame = (60 0; 200 200); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x7ff914935030>>
| | | <UICollectionView: 0x7ff912897400; frame = (0 189.333; 320 200); clipsToBounds = YES; opaque = NO; autoresize = W+H>
| | | | <DOLevelCategoryCell: 0x7ff9124ecf00; baseClass = UICollectionViewCell; frame = (0 44; 320 568)>
| | | | | <UICollectionView: 0x7ff912871000; frame = (0 0; 320 568); clipsToBounds = YES; opaque = NO>
| | | | | | <UICollectionViewControllerWrapperView: 0x7ff912726610; frame = (0 0; 320 568); autoresize = W+H>
| | | | | | | <DOLevelCategoriesViewController: 0x7ff9125a0fe0>
| | | | | | | | <UIView: 0x7ff91259a380; frame = (0 0; 320 568); opaque = NO; autoresize = RM+BM>
| | | | | | | | | <UIView: 0x7ff9125a9050; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer: 0x7ff9125aee60>>
| | | | | | | | | | <DOTriviaContainerViewController: 0x7ff912428fb0>
| | | | | | | | | | | <UIViewControllerWrapperView: 0x7ff914841cb0; frame = (0 0; 320 568); autoresize = W+H>
| | | | | | | | | | | | <UINavigationTransitionView: 0x7ff912752be0; frame = (0 0; 320 568); clipsToBounds = YES>
| | | | | | | | | | | | | <UILayoutContainerView: 0x7ff91248f590; frame = (0 0; 320 568); autoresize = W+H>
| | | | | | | | | | | | | | <UINavigationController: 0x7ff912841c00>
| | | | | | | | | | | | | | | <UIWindow: 0x7ff9124596e0; frame = (0 0; 320 568)>
| | | | | | | | | | | | | | | | <UIApplication: 0x7ff912504a70>
| | | | | | | | | | | | | | | | | <DOAppDelegate: 0x7ff912506a40>

+ (int)adjustableParameter {
return 5;
}

LongLivethreadreturn

iOS UI Debugging

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