开始/结束外观转换的呼叫不平衡 [英] Unbalanced calls to begin/end appearance transitions

问题描述

当我从我的 Viewcontroller 中显示 QLPreviewviewcontrolelr 时，运行时警告在日志中显示为

When I am presenting a QLPreviewviewcontrolelr from my Viewcontroller, the runtime warning that appears in the log as

用于开始/结束外观转换的不平衡呼叫.

任何人都可以向我建议解决方案.

Can anyone please suggest me the solution to fix.

推荐答案

这显然是Apple错误.您可以将预览控制器包装到导航控制器中，然后模态显示此导航控制器.这似乎工作正常.只有这样，您才需要手动将其消除.

This is clearly Apple bug. You can wrap preview controller into navigation controller and then present this navigation controller modally. This seems to work fine. Only then you'll have to dismiss it manually.

let picker = QLPreviewController()
picker.dataSource = self
picker.delegate = self

let navcon = UINavigationController(rootViewController: picker)

presentViewController(navcon, animated: true, completion: { 
           picker.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Done, target: self, action: #selector(MyViewController.dismiss(_:))) })

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