多次PushPop导致的`Can'taddselfassubview`问题

• 崩溃堆栈

*** Terminating app due to uncaught exception &＃39;NSInvalidArgumentException&＃39;, reason: &＃39;Can&＃39;t add self as subview&＃39;
*** First throw call stack:
(0 CoreFoundation 0x000000010ec2df35 __exceptionPreprocess &＃43; 1651 libobjc.A.dylib 0x000000010e8c8bb7 objc_exception_throw &＃43; 452 CoreFoundation 0x000000010ec2de6d &＃43;[NSException raise:format:] &＃43; 2053 UIKit 0x000000010b351982 -[UIView(Internal) _addSubview:positioned:relativeTo:] &＃43; 1234 UIKit 0x000000010b2d0b19 __53-[_UINavigationParallaxTransition animateTransition:]_block_invoke &＃43; 18145 UIKit 0x000000010b34c5ce &＃43;[UIView(Animation) performWithoutAnimation:] &＃43; 656 UIKit 0x000000010b2d0072 -[_UINavigationParallaxTransition animateTransition:] &＃43; 12257 UIKit 0x000000010b424e6c -[UINavigationController _startCustomTransition:] &＃43; 30388 UIKit 0x000000010b4303fe -[UINavigationController _startDeferredTransitionIfNeeded:] &＃43; 3869 UIKit 0x000000010b430f47 -[UINavigationController __viewWillLayoutSubviews] &＃43; 4310 UIKit 0x000000010b576509 -[UILayoutContainerView layoutSubviews] &＃43; 20211 UIKit 0x000000010b354973 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] &＃43; 52112 QuartzCore 0x000000010f589de8 -[CALayer layoutSublayers] &＃43; 15013 QuartzCore 0x000000010f57ea0e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE &＃43; 38014 QuartzCore 0x000000010f57e87e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE &＃43; 2415 QuartzCore 0x000000010f4ec63e _ZN2CA7Context18commit_transactionEPNS_11TransactionE &＃43; 24216 QuartzCore 0x000000010f4ed74a _ZN2CA11Transaction6commitEv &＃43; 39017 UIKit 0x000000010b2d814d _UIApplicationHandleEventQueue &＃43; 203518 CoreFoundation 0x000000010eb63551 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ &＃43; 1719 CoreFoundation 0x000000010eb5941d __CFRunLoopDoSources0 &＃43; 26920 CoreFoundation 0x000000010eb58a54 __CFRunLoopRun &＃43; 86821 CoreFoundation 0x000000010eb58486 CFRunLoopRunSpecific &＃43; 47022 GraphicsServices 0x0000000110c659f0 GSEventRunModal &＃43; 16123 UIKit 0x000000010b2db420 UIApplicationMain &＃43; 128224 moma-beta 0x00000001071abe1f main &＃43; 11125 libdyld.dylib 0x000000011068f145 start &＃43; 1
)
libc&＃43;&＃43;abi.dylib: terminating with uncaught exception of type NSException

• 复现步骤

• 修复方案&＃xff1a; Hook UINavigationController的

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

和

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

两个方法。

• Code

&＃64;implementation UINavigationController (PushPopCrashFix)&＃43; (void)load {static dispatch_once_t onceToken;dispatch_once(&onceToken, ^{SwizzledMethod(self, self, &＃64;selector(popViewControllerAnimated:), &＃64;selector(p_PopViewControllerAnimated:));SwizzledMethod(self, self, &＃64;selector(pushViewController:animated:), &＃64;selector(p_PushViewController:animated:));});
}- (BOOL)prohibitPushPop {return [objc_getAssociatedObject(self, &＃64;selector(prohibitPushPop)) boolValue];
}- (void)setProhibitPushPop:(BOOL) prohibitPushPop {objc_setAssociatedObject(self, &＃64;selector(prohibitPushPop), &＃64;(prohibitPushPop), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}- (UIViewController *)p_FixPopViewControllerAnimated:(BOOL)animated {if (self.prohibitPushPop) {return nil;}self.prohibitPushPop &＃61; YES;UIViewController *vc &＃61; [self DPPFixPopViewControllerAnimated:animated];[CATransaction setCompletionBlock:^{self.prohibitPushPop &＃61; NO;}];return vc;
}- (void)p_PushViewController:(UIViewController *)viewController animated:(BOOL)animated {if (self.prohibitPushPop) {return;}self.prohibitPushPop &＃61; YES;[self DPPFixPushViewController:viewController animated:animated];[CATransaction setCompletionBlock:^{self.prohibitPushPop &＃61; NO;}];
}&＃64;end