Apple Music detect is成员

Question

在iOS 9.3中，苹果发布了新的API。现在，开发人员可以查看用户当前是否是Apple Music的成员。我在试着理解它是如何工作的。我的代码-only first time-询问用户是否访问音乐库，但我不明白如何确定如何检测用户是否是成员并打开Apple music加入它。Shazam中的这些操作真的很棒。我怎么能做这样的事情呢？提前感谢！

[SKCloudServiceController requestAuthorization:^(SKCloudServiceAuthorizationStatus status) {

    NSLog(@"status is %ld", (long)status);

    SKCloudServiceController *cloudServiceController = [[SKCloudServiceController alloc] init];

    [cloudServiceController requestCapabilitiesWithCompletionHandler:^(SKCloudServiceCapability capabilities, NSError * _Nullable error) {

        NSLog(@"%lu %@", (unsigned long)capabilities, error);

        if (capabilities >= SKCloudServiceCapabilityAddToCloudMusicLibrary || capabilities==SKCloudServiceCapabilityMusicCatalogPlayback) {

            NSLog(@"You CAN add to iCloud!");


        } else {

            NSLog(@"The ability to add Apple Music track is not there. sigh.");
        }

    }];

}];

Answer 1

您应该在功能中检查SKCloudServiceCapabilityMusicCatalogPlayback标志。问题中的代码检查capabilities变量是否等于该标志，但您需要使用按位运算符。下面是你将如何做到这一点。

SKCloudServiceController *controller = [SKCloudServiceController new];
[controller requestCapabilitiesWithCompletionHandler:^(SKCloudServiceCapability capabilities, NSError * _Nullable error) {
    if (error != nil) {
        NSLog(@"Error getting SKCloudServiceController capabilities: %@", error);

    } else if (capabilities & SKCloudServiceCapabilityMusicCatalogPlayback) {
        // The user has an active subscription

    } else {
        // The user does *not* have an active subscription
    }
}];

您可以看出SKCloudServiceCapabilityMusicCatalogPlayback是一个标志，而不仅仅是一个常规常量值，因为该值使用了按位运算符(苹果文档中显示的"<<“)。

SKCloudServiceCapabilityMusicCatalogPlayback = 1 << 0

https://developer.apple.com/reference/storekit/skcloudservicecapability/skcloudservicecapabilitymusiccatalogplayback?language=objc