面消失或出现时，判断是pop还是push操作

Objective-C页面消失或出现时，判断是pop还是push操作

当前的controller消失的时候回先后执行

- (void)viewWillDisappear:(BOOL)animated;

-(void)viewDidDisappear:(BOOL)animated;

这两个方法；在这两个方法中进行判断消失的方式即可：

- (void)viewWillDisappear:(BOOL)animated {

NSArray *viewControllers = self.navigationController.viewControllers;//获取当前的视图控制其

if (viewControllers.count > 1 && [viewControllers objectAtIndex:viewControllers.count-2] == self) {

//当前视图控制器在栈中，故为push操作

NSLog(@"push");

} else if ([viewControllers indexOfObject:self] == NSNotFound) {

//当前视图控制器不在栈中，故为pop操作

NSLog(@"pop");

}

}

页面出现时会先后执行：

-(void)viewWillAppear:(BOOL)animated

-(void)viewDidAppear:(BOOL)animated

这两个方法；

如果是push出来的页面则还会执行：

- (void)viewDidLoad

所以可在viewdidload里加个 isPush = YES布尔值,然后在Appear中根据isPush判断是push还是pop：

-(void)viewWillAppear:(BOOL)animated {

[super viewWillAppear:animated];

if (_isPush) {

//push

}else{

//pop

}

---

}

别忘了页面消失时置isPush为NO:

- (void)viewWillDisappear:(BOOL)animated

{

[super viewWillDisappear:animated];

_isPush = NO;

}