旋转动画在iOS 7中不起作用

Question

我想旋转UIImageView ，它可以在iOS8中使用，但不能在iOS7中使用。 这是代码，我在做，

- (void)awakeFromNib {
    [self createAnimation];
}



- (void)animationStart {
    [self.animationImageView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
}



- (void)animationStop {
    [self.animationImageView.layer removeAnimationForKey:@"rotationAnimation"];
}



- (void)createAnimation {
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.toValue = [NSNumber numberWithFloat: -M_PI * 2.0 ];
    rotationAnimation.duration = 0.7;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = CGFLOAT_MAX;
}  

Answer 1

使用此代码来旋转图像

- (void)startSpinImage
{
    if ([_img.layer animationForKey:@"SpinAnimation"] == nil)
    {
        CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
        animation.fromValue = [NSNumber numberWithFloat:0.0f];
        animation.toValue = [NSNumber numberWithFloat: 2*M_PI];
        animation.duration = 10.0f;
        animation.repeatCount = INFINITY;
        [_img.layer addAnimation:animation forKey:@"SpinAnimation"];
    }
}

- (void)stopSpinImage
{
    [_img.layer removeAnimationForKey:@"SpinAnimation"];
}

Answer 2

尝试使用

[animationImageView startAnimating];
[animationImageView stopAnimating];