多次Push Pop导致的`Can't add self as subview`问题-白红宇

崩溃堆栈

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Can't add self as subview'*** First throw call stack:(	0   CoreFoundation                      0x000000010ec2df35 __exceptionPreprocess + 165	1   libobjc.A.dylib                     0x000000010e8c8bb7 objc_exception_throw + 45	2   CoreFoundation                      0x000000010ec2de6d +[NSException raise:format:] + 205	3   UIKit                               0x000000010b351982 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 123	4   UIKit                               0x000000010b2d0b19 __53-[_UINavigationParallaxTransition animateTransition:]_block_invoke + 1814	5   UIKit                               0x000000010b34c5ce +[UIView(Animation) performWithoutAnimation:] + 65	6   UIKit                               0x000000010b2d0072 -[_UINavigationParallaxTransition animateTransition:] + 1225	7   UIKit                               0x000000010b424e6c -[UINavigationController _startCustomTransition:] + 3038	8   UIKit                               0x000000010b4303fe -[UINavigationController _startDeferredTransitionIfNeeded:] + 386	9   UIKit                               0x000000010b430f47 -[UINavigationController __viewWillLayoutSubviews] + 43	10  UIKit                               0x000000010b576509 -[UILayoutContainerView layoutSubviews] + 202	11  UIKit                               0x000000010b354973 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 521	12  QuartzCore                          0x000000010f589de8 -[CALayer layoutSublayers] + 150	13  QuartzCore                          0x000000010f57ea0e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380	14  QuartzCore                          0x000000010f57e87e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24	15  QuartzCore                          0x000000010f4ec63e _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 242	16  QuartzCore                          0x000000010f4ed74a _ZN2CA11Transaction6commitEv + 390	17  UIKit                               0x000000010b2d814d _UIApplicationHandleEventQueue + 2035	18  CoreFoundation                      0x000000010eb63551 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17	19  CoreFoundation                      0x000000010eb5941d __CFRunLoopDoSources0 + 269	20  CoreFoundation                      0x000000010eb58a54 __CFRunLoopRun + 868	21  CoreFoundation                      0x000000010eb58486 CFRunLoopRunSpecific + 470	22  GraphicsServices                    0x0000000110c659f0 GSEventRunModal + 161	23  UIKit                               0x000000010b2db420 UIApplicationMain + 1282	24  moma-beta                           0x00000001071abe1f main + 111	25  libdyld.dylib                       0x000000011068f145 start + 1)libc++abi.dylib: terminating with uncaught exception of type NSException复制代码

复现步骤

修复方案： Hook UINavigationController的

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated;

和

- (nullable UIViewController *)popViewControllerAnimated:(BOOL)animated;

两个方法。

Code

@implementation UINavigationController (PushPopCrashFix)+ (void)load {   static dispatch_once_t onceToken;   dispatch_once(&onceToken, ^{       SwizzledMethod(self, self, @selector(popViewControllerAnimated:), @selector(p_PopViewControllerAnimated:));       SwizzledMethod(self, self, @selector(pushViewController:animated:), @selector(p_PushViewController:animated:));   });}- (BOOL)prohibitPushPop {   return [objc_getAssociatedObject(self, @selector(prohibitPushPop)) boolValue];}- (void)setProhibitPushPop:(BOOL) prohibitPushPop {   objc_setAssociatedObject(self, @selector(prohibitPushPop), @(prohibitPushPop), OBJC_ASSOCIATION_RETAIN_NONATOMIC);}- (UIViewController *)p_FixPopViewControllerAnimated:(BOOL)animated {   if (self.prohibitPushPop) {       return nil;   }   self.prohibitPushPop = YES;   UIViewController *vc = [self DPPFixPopViewControllerAnimated:animated];   [CATransaction setCompletionBlock:^{       self.prohibitPushPop = NO;   }];   return vc;}- (void)p_PushViewController:(UIViewController *)viewController animated:(BOOL)animated {   if (self.prohibitPushPop) {       return;   }   self.prohibitPushPop = YES;   [self DPPFixPushViewController:viewController animated:animated];   [CATransaction setCompletionBlock:^{       self.prohibitPushPop = NO;   }];}@end复制代码