解析跟随PFUser

Question

我试图在我的ios9项目上使用解析执行一个跟踪操作，但是当从使用objectId的解析中撤回PFUser时，有人能帮我吗(问题是在将当前用户的用户ID添加到所跟踪的用户中)

- (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期运行的操作(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]。相反，使用findObjectsInBackgroundWithBlock，然后将所有代码放在回调中。