NSURL在模拟器中为空,但在iPad上没问题

Question

我正在尝试将音频文件加载到iPad上的AVAudioPlayer中.当我在iPad上运行时,它会在捆绑中找到它.但是,如果我尝试通过模拟器运行它,我会得到NSURL的null错误.这是代码片段(num是任意int):

NSString *name = [NSString stringWithFormat:@"st-answermachine-%i", num];
NSLog(@"name = %@", name);
NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:@"m4a"];
NSLog(@"path = %@", path);
NSURL *url = [NSURL URLWithString:path];
NSLog(@"url = %@", url);

在simluator中,Debugger Console跟踪这个:

name = st-answermachine-1

path =/Users/joe/Library/Application Support/iPhone Simulator/3.2/Applications/B85E9CC8-6E39-47B9-XXXX-1E3A2CE145D1/MyApp.app/st-answermachine-1.m4a

url =(null)

但如果我在设备上试试,我会得到这个:

name = st-answermachine-1

path = /var/mobile/Applications/116DA1CB-EA13-4B80-XXXX-EBD46C8E2095/MyApp.app/st-answermachine-1.m4a

url = /var/mobile/Applications/116DA1CB-EA13-4B80-XXXX-EBD46C8E2095/MyApp.app/st-answermachine-1.m4a

有什么想法我可能会遇到这个问题吗？

谢谢!

Answer 1

URLWithString:需要一个包含实际URL作为参数的字符串(例如'http:// blah /'或'file:/// blah').URL不能包含空格(正如模拟器的路径所做的那样),这就是它失败的原因.

正如Evan建议的那样,您需要使用fileURLWithPath:将路径字符串转换为URL对象.