Question

我正在尝试使用下面的动画从视图中删除子视图。但是，当我单击按钮运行代码时，视图将立即删除。有谁知道这里发生了什么。

谢谢，

CGRect rect=[self.view viewWithTag:10].frame;
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:1];
        [UIView setAnimationDidStopSelector:@selector(removeLayer)];
        [[self.view viewWithTag:10] setFrame:CGRectMake(rect.origin.x, btn.frame.origin.y, rect.size.width, 0)];
        [UIView animateWithDuration:1.0 animations:^{[[self.view viewWithTag:10] setFrame:CGRectMake(rect.origin.x, btn.frame.origin.y, rect.size.width, 0)];} completion:^(BOOL finished){[[self.view viewWithTag:10] removeFromSuperview];}];
        [UIView commitAnimations];


-(void)removeLayer{
    [[self.view viewWithTag:10] removeFromSuperview];
}

Answer 1

您正在组合两种类型的动画API - 我认为基于块的动画API会立即返回，因此您的didStopSelector会立即被调用。

尝试使用它的这一部分：

[UIView animateWithDuration:1.0 animations:^{[[self.view viewWithTag:10] setFrame:CGRectMake(rect.origin.x, btn.frame.origin.y, rect.size.width, 0)];} completion:^(BOOL finished){[[self.view viewWithTag:10] removeFromSuperview];}];

Answer 2

看起来您正在尝试同时使用两种不同的动画方法。您所需要的只是：

CGRect rect=[self.view viewWithTag:10].frame;

[UIView animateWithDuration:1.0 animations:^{[[self.view viewWithTag:10] setFrame:CGRectMake(rect.origin.x, btn.frame.origin.y, rect.size.width, 0)];} completion:^(BOOL finished){[[self.view viewWithTag:10] removeFromSuperview];}];

Answer 3

我认为您忘了设置动画委托：

[UIView setAnimationDelegate:self];

在你的代码中，UIView不知道应该向哪个对象发送“removeLayer”选择器

删除带动画的子视图

3 个答案: