在 Objective-C 中显示和隐藏具有相同动画的 UIView？

Question

我有一个 UITextField searchbox，起初它是隐藏的，我想用动画显示它并且它有效。但是当我再次隐藏它时，动画突然发生，而不是动画中定义的时间。

这是我的代码：

    [UIView transitionWithView:searchbox duration:0.3 
    options:UIViewAnimationOptionTransitionCrossDissolve 
    animations:^{searchbox.hidden = NO;}completion:NULL];

    [UIView transitionWithView:searchbox duration:0.3 
    options:UIViewAnimationOptionTransitionCrossDissolve 
    animations:^{searchbox.hidden = YES;}completion:NULL];

Answer 1

必须使用 .alpha 来隐藏或显示 UIView。

正确的代码是：

[UIView transitionWithView:searchbox duration:0.3 
options:UIViewAnimationOptionTransitionCrossDissolve 
animations:^{searchbox.alpha=1;}completion:NULL];

[UIView transitionWithView:searchbox duration:0.3 
options:UIViewAnimationOptionTransitionCrossDissolve 
animations:^{searchbox.alpha=0;}completion:NULL];

Answer 2

动画调用之间应该有延迟。这是一个例子：

- (void)viewDidLoad {
    [super viewDidLoad];
    [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(show) userInfo:nil repeats:NO];
}

- (void) show {
    [UIView transitionWithView:searchbox duration:0.3
                       options:UIViewAnimationOptionTransitionCrossDissolve
                    animations:^{searchbox.hidden = NO;}completion:NULL];

    [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(hide) userInfo:nil repeats:NO];
}

- (void) hide {
    [UIView transitionWithView:searchbox duration:0.3
                       options:UIViewAnimationOptionTransitionCrossDissolve
                    animations:^{searchbox.hidden = YES;}completion:NULL];
}

Answer 3

显示

searchbox.alpha = 0;
searchbox.isHidden = NO;
[UIView transitionWithView:searchbox
             duration:0.3 
             options:UIViewAnimationOptionTransitionCrossDissolve 
        animations:^{
          searchbox.alpha = 1.0
    }completion:NULL];

隐藏

searchbox.alpha = 1.0;
searchbox.isHidden = NO;
[UIView transitionWithView:searchbox
             duration:0.3 
             options:UIViewAnimationOptionTransitionCrossDissolve 
        animations:^{
          searchbox.alpha = 0
    }completion:^(isComplete){
      if (isComplete) {
         searchbox.isHidden = YES
      }}];

Answer 4

使用视图的 alpha 属性而不是隐藏

[UIView transitionWithView:searchbox duration:0.3 
options:UIViewAnimationOptionTransitionCrossDissolve 
animations:^{searchbox.alpha = 1.0;}completion:NULL];

[UIView transitionWithView:searchbox duration:0.3 
options:UIViewAnimationOptionTransitionCrossDissolve 
animations:^{searchbox.alpha = 0;}completion:NULL];

在 Objective-C 中显示和隐藏具有相同动画的 UIView？

Show And Hide the UIView With Same Animation In Objective-C?

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