旋转图片

- (UIImageView *)rotate360DegreeWithImageView:(UIImageView *)imageView{

    CABasicAnimation *animation = [ CABasicAnimation animationWithKeyPath: @"transform" ];

    animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];

    //围绕Z轴旋转，垂直与屏幕

    animation.toValue = [ NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI_2, 0.0, 0.0, 1.0) ];

    animation.duration = 0.150;

    //旋转效果累计，先转180度，接着再旋转180度，从而实现360旋转

    animation.cumulative = YES;

    animation.repeatCount = 1000;

    //在图片边缘添加一个像素的透明区域，去图片锯齿

    CGRect imageRrect = CGRectMake(0, 0,imageView.frame.size.width, imageView.frame.size.height);

    UIGraphicsBeginImageContext(imageRrect.size);

    [imageView.image drawInRect:CGRectMake(1,1,imageView.frame.size.width-2,imageView.frame.size.height-2)];

    imageView.image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    [imageView.layer addAnimation:animation forKey:nil];

    return imageView;

}