Question

我的项目中有这个代码：

- (void) fadeImageView {
    [UIView animateWithDuration:1.0f
                          delay:0
                        options:UIViewAnimationCurveEaseInOut
                     animations:^{
                         self.imageView.alpha = 0.0f;
                     }
                     completion:^(BOOL finished) {
                         //make the image view un-tappable.
                         //if the fade was canceled, set the alpha to 1.0
                     }];

}

但是，有时我想在imageview变得不可见之前取消此操作。有没有办法在动画中期取消这个动画？

Answer 1

来自Apple文档： 在iOS 4.0及更高版本中不鼓励使用此方法。相反，您应该使用 animateWithDuration:delay:options:animations:completion: 方法来指定动画和动画选项。

[UIView animateWithDuration:1.f
                      delay:0
                    options:UIViewAnimationOptionBeginFromCurrentState
                 animations:^{
                     self.imageView.alpha = 0.0f;
} completion:NULL];

Answer 2

首先，您必须将UIViewAnimationOptionAllowUserInteraction添加到类似的选项中。

- (void) fadeImageView {
    [UIView animateWithDuration:1.0f
                          delay:0
                        options:UIViewAnimationCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction
                     animations:^{
                         self.imageView.alpha = 0.0f;
                     }
                     completion:^(BOOL finished) {
                         //make the image view un-tappable.
                         //if the fade was canceled, set the alpha to 1.0
                     }];

}

然后制作一个这样的方法......

-(void)stopAnimation {
    [self.routeView.layer removeAllAnimations];
}

之后当您想要使用.....

删除上述方法的动画调用时

[self performSelectorOnMainThread:@selector(stopAnimation) withObject:nil waitUntilDone:YES];

希望它能帮到你

快乐的编码......... !!!!!!!!!!!! ：）

编辑：

感谢user1244109指导我。

对于iOS7，我们还需要添加一个选项UIViewAnimationOptionBeginFromCurrentState，如：

[UIView animateWithDuration:1.0f
                              delay:0
                            options:UIViewAnimationCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState
                         animations:^{
                             self.imageView.alpha = 0.0f;
                         }
                         completion:^(BOOL finished) {
                             //make the image view un-tappable.
                             //if the fade was canceled, set the alpha to 1.0
                         }];

Answer 3

更新：首选来自Borut Tomazin的答案https://stackoverflow.com/a/21527129/194309

在完成之前取消UIView animateWithDuration

3 个答案: