我在https://developer.apple.com/musickit/上遵循了 Apple 的 MusicKit 示例代码，但无法显示设置视图控制器。我将示例代码简化为一个单独的项目，在这里：https ://github.com/higginator/SubscribePlaybackAppleMusic 。
我遵循记录在案的程序：
- 请求苹果音乐授权
- 请求苹果音乐功能
- 如果订阅符合条件，则设置订阅视图
这是示例：
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor whiteColor];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Authorize" style:UIBarButtonItemStylePlain target:self action:@selector(authorizeAppleMusic)];
_cloudServiceController = [[SKCloudServiceController alloc] init];
_setupVC = [[SKCloudServiceSetupViewController alloc] init];
_setupVC.delegate = self;
}
- (void)authorizeAppleMusic {
switch ([SKCloudServiceController authorizationStatus]) {
case SKCloudServiceAuthorizationStatusNotDetermined:
NSLog(@"auth not determined");
[self requestAppleMusicAuthorization];
break;
case SKCloudServiceAuthorizationStatusDenied:
NSLog(@"auth denied");
break;
case SKCloudServiceAuthorizationStatusRestricted:
NSLog(@"auth restricted");
break;
case SKCloudServiceAuthorizationStatusAuthorized:
NSLog(@"authorized");
[self appleMusicCapabilities];
break;
}
}
- (void)requestAppleMusicAuthorization {
[SKCloudServiceController requestAuthorization:^(SKCloudServiceAuthorizationStatus status) {
if (status == SKCloudServiceAuthorizationStatusAuthorized) {
[self appleMusicCapabilities];
}
}];
}
- (void)appleMusicCapabilities {
[self.cloudServiceController
requestCapabilitiesWithCompletionHandler:^(SKCloudServiceCapability capabilities,
NSError * _Nullable error) {
switch (capabilities) {
case SKCloudServiceCapabilityNone:
NSLog(@"apple music none");
break;
case SKCloudServiceCapabilityMusicCatalogPlayback:
NSLog(@"apple music playback");
break;
case SKCloudServiceCapabilityMusicCatalogSubscriptionEligible:
NSLog(@"apple music subscription eligible");
[self setupSubscriptionVC];
break;
case SKCloudServiceCapabilityAddToCloudMusicLibrary:
NSLog(@"apple music add to cloud music library");
break;
}
}];
}
- (void)setupSubscriptionVC {
NSDictionary<SKCloudServiceSetupOptionsKey, id> *appleMusicOptions =
@{SKCloudServiceSetupOptionsActionKey: SKCloudServiceSetupActionSubscribe};
NSLog(@"apple music options: %@", appleMusicOptions);
[self.setupVC loadWithOptions:appleMusicOptions
completionHandler:^(BOOL result, NSError * _Nullable error) {
NSLog(@"setupvc completion handler");
if (error) {
NSLog(@"setupvc error: %@", [error localizedDescription]);
}
if (result) {
NSLog(@"setupvc load complete");
[self presentViewController:self.setupVC animated:YES completion:nil];
}
}];
}
在我提供的示例项目和 Apple 的示例代码中，设置视图控制器都未加载且未显示。我可以做些什么来展示设置视图控制器？