iOS app error - Can't add self as subview
iOS app error - Can't add self as subview
已被困扰要疯了，求助如何解决
http://stackoverflow.com/questions/19560198/ios-app-err......
答案就在这里：iOS app error - Can't add self as subview
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同求答案
同一时间同时push多个controller在返回的时候会爆这样的错误，其本质的根源是push动画没有完成你就急着去push下一个controller。
解决的办法如下：
通过创建一个导航控制器的分类，将原有的push方法覆盖，再重写load方法，在里面exchange新的push和原始的push
iphone - iOS app error - Can't add self as subview - Stack Overflow
#import "UINavigationController+Consistent.h"
#import
/// This char is used to add storage for the
isPushingViewController property.
staticcharconst*constObjectTagKey="ObjectTag";
@interfaceUINavigationController()
@property(readwrite,getter = isViewTransitionInProgress) BOOL
viewTransitionInProgress;
@end
@implementationUINavigationController(Consistent)
-(void)setViewTransitionInProgress:(BOOL)property {
NSNumber *number = [NSNumbernumberWithBool:property];
objc_setAssociatedObject(self,ObjectTagKey, number , OBJC_ASSOCIATION_RETAIN);
}
-(BOOL)isViewTransitionInProgress {
NSNumber *number =objc_getAssociatedObject(self, ObjectTagKey);
return[number boolValue];
}
//注意上面是设置对象关联
#pragmamark -InterceptPop,Push,PopToRootVC
/// @name Intercept Pop, Push, PopToRootVC
- (NSArray*)safePopToRootViewControllerAnimated:(BOOL)animated{
if(self.viewTransitionInProgress)returnnil;
if(animated){
self.viewTransitionInProgress =YES;
}
//-- This is not a recursion, due to method swizzling thecall below calls the originalmethod.
return[self
safePopToRootViewControllerAnimated:animated];
}
- (NSArray*)safePopToViewController:(UIViewController*)viewController animated:(BOOL)animated {
if(self.viewTransitionInProgress)returnnil;
if(animated){
self.viewTransitionInProgress =YES;
}
//-- This is not a recursion, due to method swizzling thecall below calls the originalmethod.
return[selfsafePopToViewController:viewController animated:animated];
}
- (UIViewController*)safePopViewControllerAnimated:(BOOL)animated{
if(self.viewTransitionInProgress)returnnil;
if(animated){
self.viewTransitionInProgress =YES;
}
return[selfsafePopViewControllerAnimated:animated];
}
- (void)safePushViewController:(UIViewController*)viewController animated:(BOOL)animated {
self.delegate=self;
//-- If we are already pushing a view controller, we dont
push another one.
if(self.isViewTransitionInProgress == NO) {
//-- This is not a recursion, due to method swizzling thecall below calls the originalmethod.
[selfsafePushViewController:viewController animated:animated];
if(animated){
self.viewTransitionInProgress = YES;
}
}
}
// This is confirmed to be App Store safe.
// If you feel
uncomfortable to use Private API, you could also use the delegate method
navigationController:didShowViewController:animated:.
- (void)safeDidShowViewController:(UIViewController*)viewController animated:(BOOL)animated {
//-- This is not a recursion. Due to method swizzling this
is calling the original method.
[selfsafeDidShowViewController:viewController animated:animated];
self.viewTransitionInProgress =NO;
}
// If the user doesnt complete the swipe-to-go-back gesture,
we need to intercept it and set the flag to NO again.
- (void)navigationController:(UINavigationController*)navigationController willShowViewController:(UIViewController*)viewController animated:(BOOL)animated {
id tc =navigationController.topViewController.transitionCoordinator;
[tcnotifyWhenInteractionEndsUsingBlock:^(id context) {
self.viewTransitionInProgress =NO;
//--Reenable swipe back gesture.
self.interactivePopGestureRecognizer.delegate= (id)viewController;
[self.interactivePopGestureRecognizer setEnabled:YES];
}];
//-- Method swizzling wont work in the case of a delegate
so:
//-- forward this method to the original delegate if there
is one different than ourselves.
if(navigationController.delegate!= self) {
[navigationController.delegatenavigationController:navigationController
willShowViewController:viewController
animated:animated];
}
}
- (void)load {
//-- Exchange the original implementation with our custom
one.
method_exchangeImplementations(class_getInstanceMethod(self,@selector(pushViewController:animated:)),
class_getInstanceMethod(self,@selector(safePushViewController:animated:)));
method_exchangeImplementations(class_getInstanceMethod(self,@selector(didShowViewController:animated:)),
class_getInstanceMethod(self,@selector(safeDidShowViewController:animated:)));
method_exchangeImplementations(class_getInstanceMethod(self,@selector(popViewControllerAnimated:)),
class_getInstanceMethod(self,@selector(safePopViewControllerAnimated:)));
method_exchangeImplementations(class_getInstanceMethod(self,@selector(popToRootViewControllerAnimated:)),
class_getInstanceMethod(self,@selector(safePopToRootViewControllerAnimated:)));
method_exchangeImplementations(class_getInstanceMethod(self,@selector(popToViewController:animated:)),
class_getInstanceMethod(self,@selector(safePopToViewController:animated:)));
}
@end
//+ (void)load在类被加载的时候就会被执行，所以即使没有引入头文件或者主动调用他也会被执行。
同一时间同时push多个controller在返回的时候会爆这样的错误，其本质的根源是push动画没有完成你就急着去push下一个controller。
解决的办法如下：
通过创建一个导航控制器的分类，将原有的push方法覆盖，再重写load方法，在里面exchange新的push和原始的push
iphone - iOS app error - Can't add self as subview - Stack Overflow
#import "UINavigationController+Consistent.h"
#import
/// This char is used to add storage for the
isPushingViewController property.
staticcharconst*constObjectTagKey="ObjectTag";
@interfaceUINavigationController()
@property(readwrite,getter = isViewTransitionInProgress) BOOL
viewTransitionInProgress;
@end
@implementationUINavigationController(Consistent)
-(void)setViewTransitionInProgress:(BOOL)property {
NSNumber *number = [NSNumbernumberWithBool:property];
objc_setAssociatedObject(self,ObjectTagKey, number , OBJC_ASSOCIATION_RETAIN);
}
-(BOOL)isViewTransitionInProgress {
NSNumber *number =objc_getAssociatedObject(self, ObjectTagKey);
return[number boolValue];
}
//注意上面是设置对象关联
#pragmamark -InterceptPop,Push,PopToRootVC
/// @name Intercept Pop, Push, PopToRootVC
- (NSArray*)safePopToRootViewControllerAnimated:(BOOL)animated{
if(self.viewTransitionInProgress)returnnil;
if(animated){
self.viewTransitionInProgress =YES;
}
//-- This is not a recursion, due to method swizzling thecall below calls the originalmethod.
return[self
safePopToRootViewControllerAnimated:animated];
}
- (NSArray*)safePopToViewController:(UIViewController*)viewController animated:(BOOL)animated {
if(self.viewTransitionInProgress)returnnil;
if(animated){
self.viewTransitionInProgress =YES;
}
//-- This is not a recursion, due to method swizzling thecall below calls the originalmethod.
return[selfsafePopToViewController:viewController animated:animated];
}
- (UIViewController*)safePopViewControllerAnimated:(BOOL)animated{
if(self.viewTransitionInProgress)returnnil;
if(animated){
self.viewTransitionInProgress =YES;
}
return[selfsafePopViewControllerAnimated:animated];
}
- (void)safePushViewController:(UIViewController*)viewController animated:(BOOL)animated {
self.delegate=self;
//-- If we are already pushing a view controller, we dont
push another one.
if(self.isViewTransitionInProgress == NO) {
//-- This is not a recursion, due to method swizzling thecall below calls the originalmethod.
[selfsafePushViewController:viewController animated:animated];
if(animated){
self.viewTransitionInProgress = YES;
}
}
}
// This is confirmed to be App Store safe.
// If you feel
uncomfortable to use Private API, you could also use the delegate method
navigationController:didShowViewController:animated:.
- (void)safeDidShowViewController:(UIViewController*)viewController animated:(BOOL)animated {
//-- This is not a recursion. Due to method swizzling this
is calling the original method.
[selfsafeDidShowViewController:viewController animated:animated];
self.viewTransitionInProgress =NO;
}
// If the user doesnt complete the swipe-to-go-back gesture,
we need to intercept it and set the flag to NO again.
- (void)navigationController:(UINavigationController*)navigationController willShowViewController:(UIViewController*)viewController animated:(BOOL)animated {
id tc =navigationController.topViewController.transitionCoordinator;
[tcnotifyWhenInteractionEndsUsingBlock:^(id context) {
self.viewTransitionInProgress =NO;
//--Reenable swipe back gesture.
self.interactivePopGestureRecognizer.delegate= (id)viewController;
[self.interactivePopGestureRecognizer setEnabled:YES];
}];
//-- Method swizzling wont work in the case of a delegate
so:
//-- forward this method to the original delegate if there
is one different than ourselves.
if(navigationController.delegate!= self) {
[navigationController.delegatenavigationController:navigationController
willShowViewController:viewController
animated:animated];
}
}
- (void)load {
//-- Exchange the original implementation with our custom
one.
method_exchangeImplementations(class_getInstanceMethod(self,@selector(pushViewController:animated:)),
class_getInstanceMethod(self,@selector(safePushViewController:animated:)));
method_exchangeImplementations(class_getInstanceMethod(self,@selector(didShowViewController:animated:)),
class_getInstanceMethod(self,@selector(safeDidShowViewController:animated:)));
method_exchangeImplementations(class_getInstanceMethod(self,@selector(popViewControllerAnimated:)),
class_getInstanceMethod(self,@selector(safePopViewControllerAnimated:)));
method_exchangeImplementations(class_getInstanceMethod(self,@selector(popToRootViewControllerAnimated:)),
class_getInstanceMethod(self,@selector(safePopToRootViewControllerAnimated:)));
method_exchangeImplementations(class_getInstanceMethod(self,@selector(popToViewController:animated:)),
class_getInstanceMethod(self,@selector(safePopToViewController:animated:)));
}
@end
//+ (void)load在类被加载的时候就会被执行，所以即使没有引入头文件或者主动调用他也会被执行。