UIImageView 的旋转动画会旋转其他东西答案

【问题标题】：Rotating animation for UIImageView rotates something elseUIImageView 的旋转动画会旋转其他东西
【发布时间】：2013-03-07 01:47:34
【问题描述】：

到目前为止我的代码是

rotateButton = [UIButton new];
    rotateButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [rotateButton setFrame:CGRectMake(334, 80, 100, 20)];
    [rotateButton addTarget:self action:@selector(rotateImageView:Degrees:InTimePeriod:) forControlEvents:UIControlEventTouchUpInside];
    [rotateButton setTitle:@"Rotate" forState:UIControlStateNormal];
    [self.view addSubview:rotateButton];

-(void)rotateImageView
{
    [self rotateImageView:imageView Degrees:90 InTimePeriod:1.5];
}

-(void)rotateImageView:(UIImageView*)imageView Degrees:(NSInteger)degrees InTimePeriod:(float)time
{
    CABasicAnimation *rotate;
    rotate = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    rotate.fromValue = [NSNumber numberWithFloat:0];
    rotate.toValue = [NSNumber numberWithFloat:DEGREES_TO_RADIANS(degrees)];
    rotate.duration = time;
    rotate.repeatCount = 1;
    [imageView.layer addAnimation:rotate forKey:@"Rotate"];
}

但是，我用来开始旋转的按钮是我按下按钮后旋转的对象，而不是我希望它旋转的 imageView。如何让 imageView 旋转？

【问题讨论】：

标签： objective-c xcode uiimageview

【解决方案1】：

 [rotateButton addTarget:self action:@selector(rotateImageView:Degrees:InTimePeriod:) forControlEvents:UIControlEventTouchUpInside];

您将@selector(rotateImageView:Degrees:InTimePeriod:) 设置为按钮的操作。按钮将自己作为第一个参数发送给@selector(rotateImageView:Degrees:InTimePeriod:) 作为默认值，事实上，当函数正在运行，*imageView 指向按钮，这就是为什么按钮旋转但 imageView.Do as aeubanks 说的。

【讨论】：

【解决方案2】：

改变

    [rotateButton addTarget:self action:@selector(rotateImageView:Degrees:InTimePeriod:) forControlEvents:UIControlEventTouchUpInside];

到

    [rotateButton addTarget:self action:@selector(rotateImageView) forControlEvents:UIControlEventTouchUpInside];

【讨论】：

在这种情况下，您在某处有错误。您可能不应该直接访问 imageView，而是这样做： [self rotateImageView:self.imageView Degrees:90 InTimePeriod:1.5];