在 Cocoa Touch 中制作 UILabel 动画的更好方法？

发布于 2024-10-02 14:57:45 字数 423 浏览 0 评论 0原文

过去，当我想做一个从一个 UILabel 文本到另一个 UILabel 文本的漂亮淡入淡出动画时，我会加入以下内容：

[UIView beginAnimations:@"fade" context:nil];
[UIView setAnimationDuration:0.25];
myLabel.alpha = 0.0;
myLabel.text = @"Different string";
myLabel.alpha = 1.0;
[UIView commitAnimations];

正如您可能会说的那样，标签会快速淡出，更改内容，然后淡入。

我在其他应用程序中看到过一些实例，其中文本似乎非常平滑地淡出 - 而不会出现快速淡出和返回的情况。

是我一个人的问题还是有更好的方法来实现这一目标？

谢谢。瑞奇。

原文

In the past, when I've wanted to do a nice fade animation from one UILabel text to another, I chuck in the following:

[UIView beginAnimations:@"fade" context:nil];
[UIView setAnimationDuration:0.25];
myLabel.alpha = 0.0;
myLabel.text = @"Different string";
myLabel.alpha = 1.0;
[UIView commitAnimations];

As you can probably tell, the label does a quick fade out, change content, then fades back in.

I've seen some instances in other apps where the text just seems to fade really smoothly - without appearing to fade out and back in quickly.

Is it just me or is there a better way of achieving this?

Thanks.
Ricky.

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夕色琉璃 2024-10-09 14:57:45

希望这有帮助。

    -(void)showButton:(UIButton *)button {
        CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
        opacityAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
        opacityAnimation.toValue = [NSNumber numberWithFloat:1.0f];

        button.hidden = NO;

        [button.layer addAnimation:opacityAnimation 
                            forKey:@"opacity"];
    }

    -(void)hideButton:(UIButton *)button {

        CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
        opacityAnimation.fromValue = [NSNumber numberWithFloat:1.0f];
        opacityAnimation.toValue = [NSNumber numberWithFloat:0.0f];
        button.hidden = YES;

        [button.layer addAnimation:opacityAnimation 
                            forKey:@"opacity"];
    }

Hope this helps.

    -(void)showButton:(UIButton *)button {
        CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
        opacityAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
        opacityAnimation.toValue = [NSNumber numberWithFloat:1.0f];

        button.hidden = NO;

        [button.layer addAnimation:opacityAnimation 
                            forKey:@"opacity"];
    }

    -(void)hideButton:(UIButton *)button {

        CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
        opacityAnimation.fromValue = [NSNumber numberWithFloat:1.0f];
        opacityAnimation.toValue = [NSNumber numberWithFloat:0.0f];
        button.hidden = YES;

        [button.layer addAnimation:opacityAnimation 
                            forKey:@"opacity"];
    }

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