此应用程序正在从后台线程修改autolayout引擎 - ios9 [英] This application is modifying the autolayout engine from a background thread - ios9

问题描述

let url = NSURL(string: "http://api.mdec.club:3500/news?")

let task = NSURLSession.sharedSession().dataTaskWithURL(url!) {
    (data, response, error) in

    self.jsonResult = try! NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSMutableArray

    self.tableView.reloadData()
}

task.resume()

我不明白为什么我收到这个错误。我必须将 reloadData（）方法放在任务中，因为我必须等到获取数据。如何在不收到此错误的情况下重新加载表格视图？

I don't understand why I'm getting this error. I have to put the reloadData() method inside task because I have to wait till the get the data. How else can I reload the table view without getting this error?

推荐答案

我还能怎么重装表格视图没有收到此错误？

How else can I reload the table view without getting this error?

你走出主线程以便调用 reloadData ，像这样：

You step out to the main thread in order to call reloadData, like this:

let task = NSURLSession.sharedSession().dataTaskWithURL(url!) {
    (data, response, error) in
    self.jsonResult = try! NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSMutableArray
    dispatch_async(dispatch_get_main_queue()) {
        self.tableView.reloadData()
    }
}

在从后台线程调用的代码中触摸界面时，始终执行任何时间。除了在主线程上，你绝不能永远不会永远不会触摸界面。

Always do that any time you touch the interface from code that was called on a background thread. You must never never never never touch the interface except on the main thread.

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