createFileAtPath with imageData failed

when I use [[NSFileManager defaultManager] createFileAtPath:filePath contents:imageData attributes:nil] store image data, in some case this method return failed.I really don't know why. And the path is right,just like '/var/mobile/Containers/Data/Application/XXXXXXXX-XXXX-XXXX-XXXX-8A642743A991/Library/Caches/com.hackemist.SDWebImageCache.default/c513458d06b63d4561e39f77269e520d'. And I find in the same path,invoke [data writeToFile:filePath options:0 error:&error] work well, no error. Can someone tell me some of the reasons?

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I’d say “What error does it return?” but that method doesn’t return errors. Which speaks to a more general issue. The path-based APIs in Foundation are old and we generally recommend that you use the URL-based ones. Those return errors when they fail. So, rather than calling -[NSFileManager createFileAtPath:contents:attributes:] I recommend that you call -[NSData writeToURL:options:error:]. And if that continues to fail, you’ll get a error that should help you understand why.

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