应用程序在 UISplitViewController 的 viewWillAppear 中崩溃
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【中文标题】应用程序在 UISplitViewController 的 viewWillAppear 中崩溃【英文标题】：App crashes in viewWillAppear of UISplitViewController 【发布时间】：2014-09-29 16:00:55 【问题描述】：我正在开发一个 ios 应用程序，它使用标签栏在 UISplitViewController 的子类的子类之间进行交换。直到 iOS 8 GM 种子（和发布版本），它运行良好。
但是，当使用 iOS 8 SDK 为运行 iOS 8 的 iPad 构建时，在切换到一个（并且只有一个）视图控制器子类时，我不断遇到崩溃。此崩溃下降到超类 (UISplitViewController) 的 viewWillAppear 方法，并且与在该方法中设置的 Popover 有关：
2014-09-29 09:24:13.526 AppName[51815:2369763] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIPopoverController initWithContentViewController:] must not be called with `nil`.'
*** First throw call stack:
(
0 CoreFoundation 0x0363adf6 __exceptionPreprocess + 182
1 libobjc.A.dylib 0x031fda97 objc_exception_throw + 44
2 CoreFoundation 0x0363ad1d +[NSException raise:format:] + 141
3 UIKit 0x012eaabe -[UIPopoverController _initWithContentViewController:popoverControllerStyle:] + 436
4 UIKit 0x0111eb43 -[UISplitViewController _setupHiddenPopoverControllerWithViewController:] + 122
5 UIKit 0x0111ed82 -[UISplitViewController _viewControllerHiding:] + 322
6 UIKit 0x0112556a -[UISplitViewController viewWillAppear:] + 189
7 AppName 0x001ac9c0 -[BaseSplitViewController viewWillAppear:] + 624
8 AppName 0x00342b82 -[HomeGlanceController viewWillAppear:] + 306
9 UIKit 0x00d7914f -[UIViewController _setViewAppearState:isAnimating:] + 545
10 UIKit 0x00d796ca -[UIViewController __viewWillAppear:] + 148
11 UIKit 0x00d910b1 -[UIViewController(UIContainerViewControllerProtectedMethods) beginAppearanceTransition:animated:] + 200
12 UIKit 0x00dc2dd3 -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:] + 619
13 UIKit 0x00dc2352 -[UITabBarController transitionFromViewController:toViewController:] + 64
14 UIKit 0x00dbe545 -[UITabBarController _setSelectedViewController:] + 340
15 UIKit 0x00dbe3c7 -[UITabBarController setSelectedViewController:] + 193
16 UIKit 0x00dc222b -[UITabBarController _tabBarItemClicked:] + 326
17 libobjc.A.dylib 0x032137cd -[NSObject performSelector:withObject:withObject:] + 84
18 UIKit 0x00c1f79d -[UIApplication sendAction:to:from:forEvent:] + 99
19 UIKit 0x00c1f72f -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 64
20 UIKit 0x00f6228d -[UITabBar _sendAction:withEvent:] + 466
21 libobjc.A.dylib 0x032137cd -[NSObject performSelector:withObject:withObject:] + 84
22 UIKit 0x00c1f79d -[UIApplication sendAction:to:from:forEvent:] + 99
23 UIKit 0x00c1f72f -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 64
24 UIKit 0x00d52a16 -[UIControl sendAction:to:forEvent:] + 69
25 UIKit 0x00d52e33 -[UIControl _sendActionsForEvents:withEvent:] + 598
26 UIKit 0x00d52a4e -[UIControl sendActionsForControlEvents:] + 48
27 UIKit 0x00f670b1 -[UITabBar(Static) _buttonUp:] + 123
28 libobjc.A.dylib 0x032137cd -[NSObject performSelector:withObject:withObject:] + 84
29 UIKit 0x00c1f79d -[UIApplication sendAction:to:from:forEvent:] + 99
30 UIKit 0x00c1f72f -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 64
31 UIKit 0x00d52a16 -[UIControl sendAction:to:forEvent:] + 69
32 UIKit 0x00d52e33 -[UIControl _sendActionsForEvents:withEvent:] + 598
33 UIKit 0x00d5209d -[UIControl touchesEnded:withEvent:] + 660
34 UIKit 0x00c6faba -[UIWindow _sendTouchesForEvent:] + 874
35 UIKit 0x00c70595 -[UIWindow sendEvent:] + 791
36 AppName 0x004527b4 -[LHCWindow sendEvent:] + 100
37 UIKit 0x00c35aa9 -[UIApplication sendEvent:] + 242
38 UIKit 0x00c458de _UIApplicationHandleEventFromQueueEvent + 20690
39 UIKit 0x00c1a079 _UIApplicationHandleEventQueue + 2206
40 CoreFoundation 0x0355e7bf __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
41 CoreFoundation 0x035542cd __CFRunLoopDoSources0 + 253
42 CoreFoundation 0x03553828 __CFRunLoopRun + 952
43 CoreFoundation 0x035531ab CFRunLoopRunSpecific + 443
44 CoreFoundation 0x03552fdb CFRunLoopRunInMode + 123
45 GraphicsServices 0x0567524f GSEventRunModal + 192
46 GraphicsServices 0x0567508c GSEventRun + 104
47 UIKit 0x00c1de16 UIApplicationMain + 1526
48 AppName 0x0004c3de main + 222
49 libdyld.dylib 0x03b09ac9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
我发现有问题的 ViewController 在第一次显示时具有三个子视图，但是当我删除共享框架的两个子视图中的任何一个（通过删除 self.view addSubview 调用）时，崩溃仍然存在：
UIImageView, 50, 10, 260, 490
UIView, 50, 10, 260, 490
UIView, 50, 510, 670, 390
什么会导致 UISplitViewController 的子类中与弹出框相关的崩溃？
这是BaseSplitViewController 中的viewWillAppear:。运行异常断点在[super viewWillAppear:animated] 行停止。
- (void)viewWillAppear:(BOOL)animated
iPadAppDelegate *appDelegate_iPad = [Utils getAppDelegateForDeviceType:DEVICE_TYPE_IPAD];
if(![appDelegate_iPad getIsTabInitialised])
return ;
DDLogVerbose(@"%@ appearing",[self class]);
// Which tab is opening? Log it!
NSString *screen = [kAnalyticsNavigationPrefix stringByAppendingString:NSStringFromClass([self class])];
[AnalyticsManager logEvent:screen];
// Ensure we don't cover anything with the status bar in iOS 7. It looks like
// the orientation code wasn't being called anymore?
[self adjustControllerForOrientation:[self interfaceOrientation]];
[super viewWillAppear:animated];
BaseSplitViewController init 和 viewDidLoad - awakeFromNib 未被覆盖。
- (id)init
if (self = [super init])
[self setInterfaceOrientation:[UIApplication sharedApplication].statusBarOrientation];
return self;
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
[super viewDidLoad];
DDLogVerbose(@"%@ loaded",[self class]);
isModalViewPresent = NO;
self.view.backgroundColor = [UIColor whiteColor];
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0"))
self.edgesForExtendedLayout = UIRectEdgeNone;
HomeGlanceController 是 BaseSplitViewController 的子类（它是 UISplitViewController 的子类）。它是唯一崩溃的 BSVC 子类。
- (id)init
if (self = [super init])
bIsAnyKeypadPresent = FALSE;
//to create the favorite zone screen view
favoriteScreenBackGroundView = [[UIView alloc] initWithFrame:CGRectMake(280, 0, 720, 430)];
favoriteScreenbackGroundImageView = [[UIImageView alloc] initWithFrame:CGRectMake(40, 5, 667,405)];
favoriteZoneScreenMainView = [[UIView alloc] initWithFrame:CGRectMake(20, 40 ,640,340)];
favoriteKeypadScreenMainView = [[UIView alloc] initWithFrame:CGRectMake(10, 50 ,200,330)];
// Initialize the layout for the Favorite Controller.
[self initFavoriteLayoutCoordinates];
UITabBarItem * tabBarItem = [[UITabBarItem alloc]initWithTitle:HomeGlanceTabTitle
image:[Utils getImageNamed:HomeGlanceIcon]
tag:1];
tabBarItem.selectedImage = [Utils getImageNamed:HomeGlanceSelectedIcon];
self.tabBarItem = tabBarItem;
tabBarItem = nil;
// pick the co-ordinates of the favorite view from the layout array.
if ([favControlCoordinatesArray count]>layoutID)
[self setControllerCoordinates:[favControlCoordinatesArray objectAtIndex:layoutID]];
return self;
- (void) viewDidLoad
// I've tried commenting all but the super call out. The crash remains
[self createImageViewForFavorites];
// to create the View for favorite zone
[self createBackGroundViewForFavoriteZoneScreen];
[self createFavoriteZoneScreenToolbar];
[self createFavoriteZoneScreenMainView];
[self createFavoriteKeypadScreenToolbar];
[super viewDidLoad];
- (void)viewWillAppear : (BOOL) animated
[super viewWillAppear:animated];
[self startTimer];
iPadAppDelegate *appDelegate_iPad = [Utils getAppDelegateForDeviceType:DEVICE_TYPE_IPAD];
if(![appDelegate_iPad getIsTabInitialised])
return;
[self createFavoriteZoneScreenMainView];
[self createFavoriteKeypadScreenMainView];
// Snipped methods that don't impact the UI directly (commented out in this build)
显然，只有当 iPad 处于（或转向）纵向模式时才会发生崩溃：
可以选择选项卡而不会在横向崩溃，但在该选项卡上旋转到纵向会在super willRotateToInterfaceOrientation:duration: 崩溃。
如果在纵向选择选项卡，应用程序将在super viewWillAppear: 上崩溃
最终原因似乎是相同的（[UIPopoverController initWithContentViewController:] 不得使用nil 调用。）。
【问题讨论】：
发布导致这种情况的代码（BaseSplitViewController's -(void)viewWillAppear 我想）。此外，为了更好地调试您的异常，您可以添加一个 Objective-C 异常断点as explained here。这会让你知道导致崩溃的确切行。
@RicardoSánchez-Sáez 添加了该方法，尽管我没有看到任何似乎直接相关的内容。我正在运行我的异常断点，它在 super viewWillAppear: 调用上失败 - 忘了提，谢谢提醒我。
您能否尝试将[super viewWillAppear:animated] 调用移至所有viewWillAppear 方法的第一行？
@RicardoSánchez-Sáez 刚刚尝试过，但它仍然崩溃。我尝试删除和重建，但没有效果。这似乎表明它是在 viewLoad 或 init 中处理的，对吧？
你的代码中的popover是如何参与的？ BaseSplitViewController 在任何地方都使用弹出框吗？
【参考方案1】：
默认的preferredDisplayMode 似乎是UISplitViewControllerDisplayModeAutomatic，并且UISplitViewController 正在做一些 涉及在具有该显示模式并调用viewWillAppear 或旋转时以纵向创建弹出框控制器。
为避免崩溃，我在viewDidLoad方法中添加了更改显示模式的代码：
[self setPreferredDisplayMode:UISplitViewControllerDisplayModeAllVisible];
【讨论】：
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