ios - 如何在 Objective-c 中删除 cksubscription？

Question

很抱歉，我找不到简单的英语答案，或者至少我看到的每个答案都假设我有一定数量的知识，而这些知识是不应该有的。我只需要删除一个CKSubscription. 我该怎么做呢？所有提示和帮助将不胜感激。

Answer 1

假设您没有要删除的订阅的订阅 ID，您应该首先获取所有订阅并找出要删除的订阅的订阅 ID：

[[[CKContainer defaultContainer] publicCloudDatabase] fetchAllSubscriptionsWithCompletionHandler:^(NSArray<CKSubscription *> * _Nullable subscriptions, NSError * _Nullable error) {
    if (!error) {
        //do your logic to find out which subscription you want to delete, and get it's subscriptionID
    } else {
        //handle error
    }
}];

然后，现在您有了订阅 ID，只需将其删除：

CKModifySubscriptionsOperation *operation = [[CKModifySubscriptionsOperation alloc] initWithSubscriptionsToSave:nil subscriptionIDsToDelete:YOUR_SUBSCRIPTION_ID];

operation.modifySubscriptionsCompletionBlock = ^(NSArray <CKSubscription *> * __nullable savedSubscriptions, NSArray <NSString *> * __nullable deletedSubscriptionIDs, NSError * __nullable operationError) {
    //handle the results when the operation has completed
};

[[[CKContainer defaultContainer] publicCloudDatabase] addOperation:operation];

不要忘记始终正确处理所有可能的错误。