问题描述
解决方案文件路径,您必须使用 NSURL fileURLWithPath:。 URLWithString 的使用假定该字符串是一个非文件URL。
一个 NSURL 只有以 file:// 开头的文件URL。
Can someone explain to me why the following code:
NSString* filePathString = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0]; NSLog(@"%i", [[NSURL URLWithString:filePathString] isFileURL]); NSLog(@"%@", filePathString);outputs:
0
"/var/mobile/Applications/28ADFC19-874C-4304-94B5-F6441CAE9FAD/Documents"
This means that this url isn't a file URL. Obviously, it is.
Background:
I'm trying to use an AVCaptureMovieFileOutput to write a movie recording to a file, but the file url I'm proving gives the error:
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[AVCaptureMovieFileOutput startRecordingToOutputFileURL:recordingDelegate:] - Cannot record to URL /var/mobile/Applications/28ADFC19-874C-4304-94B5-F6441CAE9FAD/Documents/media/CrKNjNhe9so2LRnD9iHK.mov because it is not a file URL.'
That looks like a file URL to me, just like the original example. What gives?
解决方案If you want to create an NSURL from a file path, you must use NSURL fileURLWithPath:. The use of URLWithString assumes the string is a non-file URL.
An NSURL is a file URL only if it begins with file://.
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