IOS 图片 截取 和 合并

／／当前view 的截图

＃    UIGraphicsBeginImageContext(self.view.frame.size); //currentView 当前的view
＃    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
＃    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
＃    UIGraphicsEndImageContext();
＃    
＃    
＃//  图片存入相册
＃    UIImageWriteToSavedPhotosAlbum(viewImage,nil,nil,nil);

／／合并

-(UIImage *)addImage:(UIImage *)image1 toImage:(UIImage *)image2

{
UIGraphicsBeginImageContext(image2.size);

//Draw image2
[image2 drawInRect:CGRectMake(0, 0, image2.size.width, image2.size.height)];

//Draw image1
[image1 drawInRect:CGRectMake(20, 20, image1.size.width, image1.size.height)];

UIImage *resultImage=UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return resultImage;
}