Question

我有以下代码来显示和隐藏一个uiview，但是当它隐藏显示器时它非常跳跃，第二次显示它。我想只在动画完成时隐藏显示。我已经读过somwerhe我们可以在xcode中做到这一点但是我不知道我会怎么做呢？

  -(IBAction)modal:(id)sender{


        if (self.optionsuiview.hidden == YES)
        {
            [UIView animateWithDuration:0.2 animations:^{
                CGRect f = self.optionsuiview.frame;
                f.origin.x = 0;
                f.origin.y = 42;
                self.optionsuiview.frame = f;
            }];


            self.optionsuiview.hidden = NO;
        }
        else
        {

            [UIView animateWithDuration:0.2 animations:^{
                CGRect f = self.optionsuiview.frame;
                f.origin.x = 0;
                f.origin.y = 0;
                self.optionsuiview.frame = f;


    //            self.optionsuiview.hidden = YES;

            }];


            self.optionsuiview.hidden = YES;
        }
    }

Answer 1

使用其中一个animation methods，例如：

[UIView animateWithDuration:duration animations:^{
    // your animation code here
} completion:^(BOOL finished) {
    // call after animation is complete
}];

Answer 2

你可以使用。

[UIView animateWithDuration:0.2
                 animations:^{
                     CGRect f = self.optionsuiview.frame;
                     f.origin.x = 0;
                     f.origin.y = 0;
                     self.optionsuiview.frame = f;
                 }
                 completion:^(BOOL finished){
                     self.optionsuiview.hidden = YES;
                 }];

Animating Views with Block Objects

有一些新方法

 + (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options
 animations:(void (^)(void))animations completion:(void (^)(BOOL
 finished))completion NS_AVAILABLE_IOS(4_0);

 + (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion
 NS_AVAILABLE_IOS(4_0); // delay = 0.0, options = 0

动画完成动作

2 个答案: