1

我正在尝试用 NSTextField 做一个简单的动画

   - (void)bounceTimeLabel
{
    // Create a key frame animation
    CAKeyframeAnimation *bounce =
    [CAKeyframeAnimation animationWithKeyPath:@"transform"];

    // Create the values it will pass through
    CATransform3D forward = CATransform3DMakeScale(1.3, 1.3, 1);
    CATransform3D back = CATransform3DMakeScale(0.7, 0.7, 1);
    CATransform3D forward2 = CATransform3DMakeScale(1.2, 1.2, 1);
    CATransform3D back2 = CATransform3DMakeScale(0.9, 0.9, 1);
    [bounce setValues:[NSArray arrayWithObjects:
                       [NSValue valueWithCATransform3D:CATransform3DIdentity],
                       [NSValue valueWithCATransform3D:forward],
                       [NSValue valueWithCATransform3D:back],
                       [NSValue valueWithCATransform3D:forward2],
                       [NSValue valueWithCATransform3D:back2],
                       [NSValue valueWithCATransform3D:CATransform3DIdentity],
                       nil]];
    // Set the duration
    [bounce setDuration:0.6];

    // Animate the layer

    NSLog(@"The layer is %@", [[self testTextField] layer]);

    if (![self testTextField]) {
        NSLog(@"Textfeild is nil");
    } else {
        NSLog(@"Testfield exists and is of type: %@", [[self testTextField] class]);
    }


    [[[self testTextField] layer] addAnimation:bounce
                             forKey:@"bounceAnimation"];



}

当我运行它时,什么都没有发生,此外,当我将 layer 发送到 NSTextField 实例时,它根据 NSlog 语句返回 null 。此代码来自使用 UILabel 而不是 NSTextField 的 iOS 示例......这可能是问题吗?

我的输出是

2013-09-08 07:12:17.314 Allocator[646:303] 层为(空) 2013-09-08 07:12:17.315 Allocator[646:303] 测试字段存在且类型为:NSTextField

4

1 回答 1

0

找到了这个SO Answer并意识到我必须 setWantsLayer:YES 来查看视图,所以我添加了

[[self testTextField] setWantsLayer:YES];

到 awakeFromNib 并且一切正常

于 2013-09-08T15:30:46.467 回答