问题
Having a problem getting the URL for a resource for some reason: This code is in viewDidLoad, and it's worked in other applications, but not here for some reason:
NSString* audioString = [[NSBundle mainBundle] pathForResource:@"sound" ofType:@"wav"];
NSLog(@"AUDIO STRING: %@" , audioString);
NSURL* audioURL = [NSURL URLWithString:audioString];
NSLog(@"AUDIO URL: %d" , audioURL);
NSError* playererror;
audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:audioURL error:&playererror];
[audioPlayer prepareToPlay];
NSLog(@"Error %@", playererror);
LOG OUTPUT:
AUDIO STRING: /var/mobile/Applications/D9FA0569-45FF-4287-8448-7EA21E92EADC/SoundApp.app/sound.wav
AUDIO URL: 0
Error Error Domain=NSOSStatusErrorDomain Code=-50 "Operation could not be completed. (OSStatus error -50.)"
回答1:
Your string has no protocol, so it's an invalid url. Try this...
NSString* expandedPath = [audioString stringByExpandingTildeInPath];
NSURL* audioUrl = [NSURL fileURLWithPath:expandedPath];
回答2:
Just change one line to this:
NSURL* audioURL = [NSURL fileURLWithPath:audioString];
回答3:
You're passing audioURL in your NSLog method as %d hence why you get 0. If you pass it as an object with %@ you'll get NULL.
Try passing into the audioplayer like this and skip the string.
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: [[NSBundle mainBundle] pathForResource:@"sound" ofType:@"wav"]];
回答4:
You aren't reading the responses carefully enough - you are using URLWithString, when you should use fileURLWithPath. You can't pass a file:// path to URLWithString. I think you also need to prepend file:// at the front of the string as you have only a path (which as pointed out has no protocol).
来源：https://stackoverflow.com/questions/2112927/urlwithstring-returns-nil-for-resource-path-iphone