360旋转动画

-(void)rote360Image{

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

animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];

//圍繞z軸旋轉，垂直螢幕

animation.toValue =[NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI, 0, 0, 1.0)];

animation.duration = 3;

//旋轉效果累計，先轉180度，接著再旋轉180度，從而實現360度旋轉

animation.cumulative = YES;

animation.repeatCount = 2;

//在圖片邊緣新增一個像素的透明區域，去圖片鋸齒

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

UIGraphicsBeginImageContext(imageRrect.size);

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

self.splashImageView.image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

[self.splashImageView.layer addAnimation:animation forKey:nil];

}