我是一名有用的助手,可以为您进行翻译。以下是需要翻译的内容:
我尝试过在Stack Overflow和Google上搜索,但似乎没有人遇到这个问题。
我的iOS应用程序中有两个ViewControllers
。
在viewControllerA
中,当发生轻拍事件时,我调用:
[self performSegueWithIdentifier:@"fooSegue" sender:self];
这会调用以下内容:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
在 viewControllerA
上
没有问题。
然而,在这个方法之后,
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
viewDidLoad
和viewWillAppear
在调用viewControllerB
之前就被调用了。我不需要这个方法在这个阶段运行在此viewController
上。除此之外,在调用viewControllerB
的prepareForSegue
方法之后,viewDidLoad
/ viewWillAppear
将被调用两次。
我尝试使用堆栈跟踪来查看是谁在调用它 - 但这就是我得到的:
* thread #1: tid = 0x5eac3, 0x0001e859 TestApp`-[viewControllerB prepareForSegue:sender:](self=0x0dad98b0, _cmd=0x0188185a, segue=0x0ce9e6f0, sender=0x0dad98b0) + 89 at viewControllerB.m:444, queue = 'com.apple.main-thread', stop reason = breakpoint 3.1 * frame #0: 0x0001e859 TestApp`-[ViewControllerB prepareForSegue:sender:](self=0x0dad98b0, _cmd=0x0188185a, segue=0x0ce9e6f0, sender=0x0dad98b0) + 89 at ViewControllerB.m:444
frame #1: 0x015f8efa UIKit`-[UIStoryboardSegueTemplate _perform:] + 156
frame #2: 0x015f8f87 UIKit`-[UIStoryboardSegueTemplate perform:] + 115
frame #3: 0x011b32e2 UIKit`-[UIViewController loadViewIfRequired] + 605
frame #4: 0x011b35d9 UIKit`-[UIViewController view] + 35
frame #5: 0x011cd942 UIKit`-[UINavigationController _startCustomTransition:] + 778
frame #6: 0x011da8f7 UIKit`-[UINavigationController _startDeferredTransitionIfNeeded:] + 688
frame #7: 0x011db4e9 UIKit`-[UINavigationController __viewWillLayoutSubviews] + 57
frame #8: 0x0131c0d1 UIKit`-[UILayoutContainerView layoutSubviews] + 213
frame #9: 0x01103964 UIKit`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 355
frame #10: 0x023e682b libobjc.A.dylib`-[NSObject performSelector:withObject:] + 70
frame #11: 0x0286245a QuartzCore`-[CALayer layoutSublayers] + 148
frame #12: 0x02856244 QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 380
frame #13: 0x028560b0 QuartzCore`CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 26
frame #14: 0x027bc7fa QuartzCore`CA::Context::commit_transaction(CA::Transaction*) + 294
frame #15: 0x027bdb85 QuartzCore`CA::Transaction::commit() + 393
frame #16: 0x0287b5b0 QuartzCore`+[CATransaction flush] + 52
frame #17: 0x010929bb UIKit`_UIApplicationHandleEventQueue + 13095
frame #18: 0x02a1e77f CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
+ 15
frame #19: 0x02a1e10b CoreFoundation`__CFRunLoopDoSources0 + 235
frame #20: 0x02a3b1ae CoreFoundation`__CFRunLoopRun + 910
frame #21: 0x02a3a9d3 CoreFoundation`CFRunLoopRunSpecific + 467
frame #22: 0x02a3a7eb CoreFoundation`CFRunLoopRunInMode + 123
frame #23: 0x04bca5ee GraphicsServices`GSEventRunModal + 192
frame #24: 0x04bca42b GraphicsServices`GSEventRun + 104
frame #25: 0x01094f9b UIKit`UIApplicationMain + 1225
frame #26: 0x0011112d TestApp`main(argc=1, argv=0xbfffedf8) + 141 at main.m:16
我不确定这是什么意思。
有人能解释一下这里发生了什么吗?
viewDidLoad
/viewDidAppear
/等方法被调用,然后再在其子视图控制器(嵌入式视图的视图控制器)上调用一次。您希望父视图控制器和子视图控制器有不同的视图控制器,并且每个视图控制器都应该看到它们自己的一系列调用。 - Rob