UIImageView旋转任意角度－－－实现方法

转自:http://blog.csdn.net/trandy/article/details/6626281

1. -(UIImageView *) makeRotation:(UIImageView *)image speedX:(float)X speedY:(float)Y  
2. {  
3.       
4. //    头文件中需要定义 PI  
5. //    #define PI 3.14159265358979323846264338327950288  
6.       
7.     if (Y<0) {  
8.         image.transform = CGAffineTransformMakeRotation(atan(X/(-Y)));  
9.     }else if(Y>0){  
10.         image.transform = CGAffineTransformMakeRotation(atanf(X/(-Y))-PI);   
11.     }  
12.     return image;  
13. }