iOS 合并多张图片的方法

UIGraphicsBeginImageContextWithOptions(_targetView.frame.size, YES, 0.0);

//图片1

[_targetView.image drawInRect:_targetView.frame];

//图片2

[_sourceV.image drawInRect:_sourceV.frame]

UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return img;

 [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

 UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    
 UIGraphicsEndImageContext();