保存图片到相册

 

            NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

            NSString *documentsDirectory = [paths objectAtIndex:0];

            NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:@"savedImage.png"];

             //also be .jpg or another

            NSData *imageData = UIImageJPEGRepresentation(resultImage,0.8);

            [imageData writeToFile:savedImagePath atomically:NO];