UIImageWriteToSavedPhotosAlbum只能保存10张图片。为什么？ [英] UIImageWriteToSavedPhotosAlbum saves only 5 image out of 10. Why?

问题描述

我有题目的问题。
是否有限制，例如每秒导出3张图像，或类似的东西？

  for（int frameStepper = 0; frameStepper< [Something frameCount]; frameStepper ++）
 {
 //获取文件名。 
 imagePath = [documentsDirectory stringByAppendingPathComponent：[NSString stringWithFormat：@frame_％i.jpg，frameStepper]]; 
 
 //阅读图片。 
 UIImage * image = [[[UIImage alloc] initWithContentsOfFile：imagePath] autorelease]; 
 
 //写图像。 
 UIImageWriteToSavedPhotos相册（image，nil，nil，nil）; 
} 
  

此代码后，我有10个图像中导出了5个图像。看不出为什么请帮助，非常感谢。

解决方案

如果我记录完成的错误，它说：

 错误域= ALAssetsLibraryErrorDomain代码= -3301写忙UserInfo = 0x69e8e20 {NSLocalizedFailureReason =由于写入资源繁忙，写入此资产时出现问题，NSLocalizedRecoverySuggestion =尝试再写一次，NSLocalizedDescription = Write busy} 
  

这意味着我必须等待完成运行过程通过实现给定的回调：

   - （void）image：（UIImage *）image 
 didFinishSavingWithError： （NSError *）错误
 contextInfo：（void *）contextInfo 
  

Hurray。 >

I have the problem as the title goes. Are there any restrictions, like "Export only 3 image per second", or something like?

        for (int frameStepper = 0; frameStepper < [Something frameCount]; frameStepper++)
        {
            //Get the filename.
            imagePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"frame_%i.jpg", frameStepper]];

            //Read image.
            UIImage *image = [[[UIImage alloc] initWithContentsOfFile:imagePath] autorelease];

            //Write image.
            UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
        }

I have 5 images exported out of 10 after this code. Cannot see why. Please help, many thanks.

解决方案

If I log the error of completion, it says:

Error Domain=ALAssetsLibraryErrorDomain Code=-3301 "Write busy" UserInfo=0x69e8e20 {NSLocalizedFailureReason=There was a problem writing this asset because the writing resources are busy., NSLocalizedRecoverySuggestion=Try to write again, NSLocalizedDescription=Write busy}

That means I have to wait for the completition of the running processes by implementing the given callback:

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

Hurray.

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