ios - 解析以下 PFUser

Question

我正在尝试在我的 ios9 项目上进行跟随解析操作，但在从中检索 PFUser 时遇到了一些问题解析使用 objectId 任何人都可以帮助我(问题是将当前用户的用户 ID 添加到后面的用户)

- (IBAction)followButtonAction:(id)sender {

PFQuery * query = [PFUser query];
[query whereKey:@"objectId" equalTo:_a.userId];   
NSArray *objects = [query findObjects];   
PFUser *user= objects.firstObject;

//add the user ID for the cell we are following to the array of followed items in the user class in parse
    [[PFUser currentUser] addUniqueObject:_a.userId forKey:@"followed"];
    [[PFUser currentUser] saveInBackground];

//add the user ID to the user that the user followed
    [user addUniqueObject:[PFUser currentUser].objectId forKey:@"followers"];
    [user saveInBackground];
}

Answer 1

假设您的问题是关于长时间运行的操作(根据您的评论):

您的查询正在主线程上执行，因为您调用了[query findObjects]。请改用 findObjectsInBackgroundWithBlock，并将其后的所有代码放入回调内。