NSURL 在模拟器中为空，但在 iPad 上可以
我正在尝试将音频文件加载到 iPad 上的 AVAudioPlayer 中。当我在 iPad 上运行它时，它发现它在捆绑包中很好。但是，如果我尝试通过模拟器运行它，我会收到 NSURL 的空错误。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);
在模拟器中，调试器控制台跟踪此：
名称 = st-answermachine-1
路径 = /Users/joe/Library/Application Support/iPhone Simulator/3.2/Applications/B85E9CC8-6E39-47B9-XXXX-1E3A2CE145D1/MyApp.app/st-answermachine-1.m4a
网址=（空）
但是如果我在设备上尝试它，我会得到：
名称 = st-answermachine-1
路径 = /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
请问我为什么会遇到此问题？
谢谢！
I'm trying to load an audio file into AVAudioPlayer on the iPad. When I run it on the iPad it finds it in the bundle fine. However, if I try and run it through the simulator, I get a null error for NSURL. Here's the snippet of code (num is an arbitrary 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);
In the simluator, the Debugger Console traces this:
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)
But if I try it on the device, I get this:
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
Any ideas why I might have this problem please?
Thanks!
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
URLWithString:需要一个包含实际 URL 的字符串作为其参数（例如“http://blah/”或“file:///blah”）。 URL 不能包含空格（就像模拟器的路径一样），这就是它失败的原因。正如 Evan 所建议的，您需要使用
fileURLWithPath:将路径字符串转换为 URL 对象。URLWithString:expects a string containing an actual URL as its parameter (e.g. 'http://blah/' or 'file:///blah'). URLs can't contain spaces (as the simulator's path does), and that's why it's failing.As Evan suggests, you need to use
fileURLWithPath:to convert a path string to a URL object.