如何在removefromsuperview后执行方法

Question

我有一个 UIViewController（称为 SubUIVC），它是使用 showNewView 方法通过我的主 UIViewController（称为 MainUIVC）加载的，当我完成 SubUIVC 时，我使用 goBack 方法返回到 MainUIVC。

我想做的是在 goBack 方法完成并且我的 MainUIVC.view 已加载后执行 MainUIVC 中的一些代码。

谁能帮我做这个吗？下面是我上面参考的两种方法。

-(void) showNewView:(UIViewController*)showView{    
UIView *currentView = self.view;

    // get the the underlying UIWindow, or the view containing the current view
    UIView *theWindow = [currentView superview];    
    UIView *newView = showView.view; 

    // remove the current view and replace with newView
    [theWindow addSubview:newView];

    // set up an animation for the transition between the views
    CATransition *animation = [CATransition animation];
    [animation setDuration:WIPE_ANIMATION_DURATION];
    [animation setType:kCATransitionPush];
    [animation setSubtype:kCATransitionFromRight];
    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

    [[theWindow layer] addAnimation:animation forKey:@"SwitchToNewView"];
}

-(IBAction)goBack:(id)sender{       
    UIView *currentView = self.view;

    // get the the underlying UIWindow, or the view containing the current view
    UIView *theWindow = [currentView superview];

    // remove the current view and replace with superview
    [currentView removeFromSuperview];

    // set up an animation for the transition between the views
    CATransition *animation = [CATransition animation];
    [animation setDuration:WIPE_ANIMATION_DURATION];
    [animation setType:kCATransitionPush];
    [animation setSubtype:kCATransitionFromLeft];
    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

    [[theWindow layer] addAnimation:animation forKey:@"SwitchToNewView"];
}

Answer 1

MainController 中有一个 BOOL 属性，而不是由 goBack: 函数设置的 get 属性。

在主控制器的 viewDidAppear: 中，检查 BOOL 以查看视图是否因 goback: 被调用而刚刚出现，然后执行您的操作。显然你应该重置该标志。