iOS开发中实现同时将多张照片写入到本地相册中

代码：

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    NSArray * images = @[[UIImage imageNamed:@"11 pro Max"], [UIImage imageNamed:@"11 pro Max"], [UIImage imageNamed:@"11 pro Max"]];
    for (int i = 0; i < images.count; i ++) {
        UIImage * image = images[i];
        NSLog(@"%@", [NSThread currentThread]);
        [self loadImageFinished:image];
    }
}

- (void)loadImageFinished:(UIImage *)image{
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        NSLog(@"%@", [NSThread currentThread]);
        //写入图片到相册
        [PHAssetChangeRequest creationRequestForAssetFromImage:image];
    } completionHandler:^(BOOL success, NSError * _Nullable error) {
        NSLog(@"success = %d, error = %@", success, error);
        if(success){
            dispatch_async(dispatch_get_main_queue(), ^{
                NSLog(@"保存成功");
            });
        } else {
            NSLog(@"保存不成功");
        }
    }];
}

[PHPhotoLibrary sharedPhotoLibrary] performChanges...方法可以在子线程中保存图片到本地。