Question

我有一个小代码来显示图像1，2秒后用image2替换image1和动画

UIImageView *view1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 410, 1020, 400)];
UIImage *image = [UIImage imageNamed:@"img.jpeg"];
view1.image = image;
[self.view addSubview:view1];
UIImageView *view2 = [[UIImageView alloc] init ];
view2.frame = CGRectMake(0, 410, 0, 400);
view2.image = [UIImage imageNamed:@"bien.jpeg"];
[self.view addSubview:view2];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.8];
[UIView setAnimationDelay:2];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(removeView: view1:)];
view2.frame =  CGRectMake(0, 410, 800, 400);
[UIView commitAnimations];

和函数removeView从下面的superview中删除view1：

-(void)removeView: (UIImageView *)view1{
[view1 removeFromSuperview];
 }

所以我不知道为什么我从superview中删除view1的功能不起作用，请帮助我！非常感谢...

Answer 1

选择器无法传递参数。将您的方法修改为

-(void)removeView{
   [view1 removeFromSuperview];
 }

其中“view1”是您视图的实例。

和您的选择器：

[UIView setAnimationDidStopSelector:@selector(removeView)];

Answer 2

我建议您使用基于块的动画（自iOS 4起可用）。它们更容易使用，不需要通过方法和所有东西发送参数。例如：

UIImageView *view1 = [[UIImageView alloc] init];
//initialize your UIImageView view1
[self.view addSubview:view1];
UIImageView *view2 = [[UIImageView alloc] init];
//initialize your UIImageView view2
[UIView animateWithDuration:2 animations:^{
    //here happens the animation
    [self addSubview:view2];
} completion:^(BOOL finished) {
    //here happens stuff when animation is complete
    [view1 removeFromSuperView];
}];

请记住将其投票或标记为已接受的答案;）

Answer 3

试试这段代码!!

UIImageView *view1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 410, 1020, 400)];
UIImage *image = [UIImage imageNamed:@"img.jpeg"];
view1.tag = 1;
view1.image = image;
[self.view addSubview:view1];

UIImageView *view2 = [[UIImageView alloc] init ];
view2.frame = CGRectMake(0, 410, 0, 400);
view2.image = [UIImage imageNamed:@"bien.jpeg"];
[self.view addSubview:view2];

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.8];
[UIView setAnimationDelay:2];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:@selector(removeView: view1:)];
view2.frame =  CGRectMake(0, 410, 800, 400);
[UIView commitAnimations];

//删除查看方法

-(void)removeView : (UIImageView *) imgVew {

    if (imgVew.tag == 1)

        [imgVew removeFromSuperView];
}

访问它 -

[UIView setAnimationDidStopSelector:@selector(removeView:)];

Answer 4

问题很简单，这个选择器不存在于您的班级中：-removeView:view1:。因此在动画结束后没有任何东西可以回复。这就是为什么你的-(void)removeView:(UIImageView *)view1;方法永远不会被回调的原因。

请注意，您的真实选择器为-removeView:且不等于-removeView:view1:

如果你想通过didStopSelector传递参数，我会有一个坏消息：你不能像你在代码中那样做，所以这部分是错误的：

// WRONG AT ALL:    
[UIView setAnimationDidStopSelector:@selector(removeView:view1:)];

// PROPER WAY:
[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];

因为didStopSelector必须是具有以下参数的以下类型的选择器。

- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context;

您可以为您的回调方法传递参数，如下所示：

[UIView beginAnimations:nil context:view1]; // see the context's value

在您的didStopSelector中，您可以使用它：

- (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
    [((UIView *)context) removeFromSuperView];
}

替换为view2后删除视图1

4 个答案: