UIPresentationController崩溃只是指向AppDelegate [英] UIPresentationController crash just points to AppDelegate

问题描述

屏幕截图:

我遇到了很多此类崩溃，但问题是我只是被指向我的appDelegate第一行.我不知道在哪里寻找问题.您可以从以下崩溃报告中开始调查的任何想法吗?

I am getting a lot of these crashes but the problem is I'm just being pointed to my appDelegate first line. I've no idea where to look for the issue. Any ideas where I could start to investigate from the following crash report?

Crashed: com.apple.main-thread
0  UIKit                          0x18d005640 __56-

[UIPresentationController runTransitionForCurrentState]_block_invoke + 460
1  UIKit                          0x18cf27aa8 _runAfterCACommitDeferredBlocks + 292
2  UIKit                          0x18cf1ae5c _cleanUpAfterCAFlushAndRunDeferredBlocks + 288
3  UIKit                          0x18ccac464 _afterCACommitHandler + 132
4  CoreFoundation                 0x1836a6cdc __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
5  CoreFoundation                 0x1836a4694 __CFRunLoopDoObservers + 412
6  CoreFoundation                 0x1836a4c50 __CFRunLoopRun + 1292
7  CoreFoundation                 0x1835c4c58 CFRunLoopRunSpecific + 436
8  GraphicsServices               0x185470f84 GSEventRunModal + 100
9  UIKit                          0x18cd1d5c4 UIApplicationMain + 236
10 AppName                        0x100ae3ca4 main (AppDelegate.swift:23)
11 libdyld.dylib                  0x1830e456c start + 4

更新:

基于以下内容:

应用程序在runTransitionForCurrentState上崩溃但没有任何线索为什么

我正在寻找潜在的原因，并且想知道以下代码.

I'm looking at potential causes and am wondering about the following code.

在执行同步过程时，我具有以下功能，可通过活动指示器显示视图.

I have the following func for presenting a view with an activity indicator while I am doing a sync process.

public func displayActivityAlertWithCompletion(_ title: String, ViewController: UIViewController, completionHandler: @escaping ()->())
{
    let pending = UIAlertController(title: "\n\n\n"+title, message: nil, preferredStyle: .alert)
    //create an activity indicator
    let indicator = UIActivityIndicatorView(frame: pending.view.bounds)
    indicator.autoresizingMask = [.flexibleWidth, .flexibleHeight]
    indicator.color = UIColor(rgba: Palette.loadingColour)
    //add the activity indicator as a subview of the alert controller's view
    pending.view.addSubview(indicator)
    indicator.isUserInteractionEnabled = false
    // required otherwise if there buttons in the UIAlertController you will not be able to press them
    indicator.startAnimating()


    ViewController.present(pending, animated: true, completion: completionHandler)
}

然后我像这样使用这个函数:

I then use this func like so:

displayActivityAlertWithCompletion("Pushing Data", ViewController: self){_ in
    Helper_class.doSync(_cleanSync: false){
        //sync is complete
        Prefs.is_Syncing = false
        DispatchQueue.main.async {
            //dismiss my view with activity alert
            self.dismiss(animated: true){
                //dismiss my viewcontroller
                Toast(text: "Upload sync completed").show()
                self.dismiss(animated: true, completion: nil)
            }
        }
    }
}

这是否可能是导致UIKit问题的原因?

Would this be a potential cause for the UIKit issue?

推荐答案

按照以下步骤操作，您可以做到: 1.打开导航器； 2.切换到BreakPoint Navigator； 3.单击左下方的"+"按钮； 4.弹出时，单击异常断点".

Follow these steps, you can make it: 1. Open Navigator; 2. Switch to BreakPoint Navigator; 3. Click the "+" button in the bottom left; 4. When pop up, click "Exception BreakPoint".

然后再次运行您的项目，它将在确切的位置中断.

Then run your project again, it will break at the exact point.

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