NSBundle的使用，注意mainBundle和Custom Bundle的区别

NSString *earth = [[NSBundle mainBundle] pathForResource:@"Brad Cox" ofType:@"png"];

NSString *resourceBundle = [[NSBundle mainBundle] pathForResource:@"Resources" ofType:@"bundle"];

    NSLog(@"resourceBundle: %@", resourceBundle);

    NSString *earth = [[NSBundlebundleWithPath:resourceBundle] pathForResource:@"Matthijs"ofType:@"jpg"inDirectory:@"Images/MoreImages"];

    NSLog(@"path: %@", earth);

注意：Since

bundles other than the main bundle can have folders embedded inside them, to access

files inside folders of a bundle other than the main bundle it is best to use the pathFor

Resource:ofType:inDirectory: method of NSBundle to explicitly specify the folder in

which a specific file/resource exists.