UIImageWriteToSavedPhotosAlbum将应用中的图片保存到用户iPhone或者iTouch的相册中

- (void)savePicToPhotoes

{

UIGraphicsBeginImageContext(self.view.bounds.size);

CGContextRef ref = UIGraphicsGetCurrentContext();

[_board.layer renderInContext:ref];

UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

}

#pragma mark 显示提示框

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{

//创建alert

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"图片已保存到相册" message:nil preferredStyle:UIAlertControllerStyleAlert];

//创建action

UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];

[alert addAction:action];

[self presentViewController:alert animated:YES completion:nil];

}