UIImageWriteToSavedPhotosAlbum saves only 5 image out of 10. Why?

Question

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

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Answer 1

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.