Question

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)flag
{
    [[self model] setTransitioning:NO];
    [[[[self view]subviews] objectAtIndex:0] removeFromSuperview];
}


How can I tell what kind of viewController controls the subview at index 0?
If it's a QuizViewController I need to call a function on it.

Thanks in advance.

Good answers. I don't believe I explained enough. This is a all in a view controller that is a view stack. The view controller adds and deletes views manually with an animated transition. I am not using a navigationController and cannot in this particular instance for other reasons.

Sometimes the views I add are simple UIImageViews. Sometimes they are QuizViews. The QuizViews have a QuizViewController because they need internal functionality. Here are the two functions I use to add the views.  

- (void)loadQuiz:(NSInteger )quizNum 


{
        if([self quizViewController] != nil)
        {
            [self setQuizViewController:nil];
        }
        QuizViewController *quiz = [[QuizViewController alloc] initWithNibName:@"QuizViewController" bundle:nil];
        [quiz setUp:quizNum];
        [self setQuizViewController:quiz];
        [quiz release];

[[self view] addSubview:[[self quizViewController]view]];
[self setSlide1:[[[self view] subviews] objectAtIndex:0]];
[self setSlide2:[[[self view] subviews] objectAtIndex:1]];
[[self slide1] setHidden:NO];
[[self slide2] setHidden:YES];

[self performTransition];


}

- (void)loadImage:(NSString *)slideImage


{

UIImage *tempImg = [UIImage imageWithContentsOfFile:[Utilities localPathForFileName:slideImage]];
UIImageView *temp = [[UIImageView alloc] initWithImage:tempImg];
[[self view] addSubview:temp];
[temp release];

//[topView release];

if ([[[self view]subviews] count] > 2) {
        //add the 2nd subview
        //[[[[self view]subviews] objectAtIndex:0] removeFromSuperview];
}

[self setSlide1:[[[self view] subviews] objectAtIndex:0]];
[self setSlide2:[[[self view] subviews] objectAtIndex:1]];
[[self slide1] setHidden:NO];
[[self slide2] setHidden:YES];

NSLog(@"%s %d",__FUNCTION__,[[[self view]subviews] count]);
[self performTransition];

}

所以我的问题仍然是，在animationDidStop函数中如何检测它是否是一个测验？

Answer 1

if（[[self view] subviews] objectAtIndex：0] isKindOfClass：CLASS（class）） ...

或isMemberofClass

从内存开始，你必须测试它......

您还可以在创建视图时在视图上设置标记，然后在检索时查找视图。

someUIView.tag = 99;

然后

if（[[self view] subviews] objectAtIndex：0] .tag == 99） ...

干杯

Answer 2

维护一个UIViewController（例如UIViewController * currentViewController）对象，用于保持当前视图控制器的轨迹。
现在在推送到视图控制器之前，根据我的理解被多个视图控制器推动，你可以使用你正在推动的viewController设置currentViewController。因此，如果你在QuizViewController中并推送到控制子视图的viewController，你首先设置它的currentController然后推它。
subViewController.currentController = self;
[self.navigationController pushViewController：subViewController animated：YES];

Answer 3

视图本身并没有附加视图控制器，因此你的问题措辞的方式并不合理。如果你正在做的是拥有一个UIView子类，比如QuizView，作为一个子视图，并且需要知道何时删除它并对其进行操作，那么代码将如下所示;

-(void) animationDidStop:(CAAnimation*)theAnimation finished:(BOOL)flag 
{ 
    [[self model] setTransitioning:NO]; 
    UIView *subview = [self.view.subviews objectAtIndex:0];
    if([subview isKindOfClass:[QuizView class]])
    {
        [(QuizView*)subview yourFunction];
    }    

    [subview removeFromSuperview];
}

如果你的意思不同，你可以提供一些代码，我可能会提供更多帮助，但就像我说你原来的问题对我来说并不十分清楚，如果这不是你的意思;）

如何在删除子视图时知道哪个viewController

3 个答案: