Swift安全区域布局指南和视觉格式语言 [英] Swift Safe Area Layout Guide and Visual Format Language

问题描述

我想使用Apples视觉格式语言将视图限制为新的安全iOS 11中的区域布局指南.但是，我遇到一个例外:

I want to use Apples visual format language to constrain a view to the new Safe Area Layout Guide in iOS 11. However, I get an exception:

-[NSLayoutYAxisAnchor nsli_superitem]:无法识别的选择器已发送到实例0x1c447ed40

-[NSLayoutYAxisAnchor nsli_superitem]: unrecognized selector sent to instance 0x1c447ed40

    //Make View Dictionary
    var views: [String: Any] = ["left": self.leftContainer]

    //Check swift version and add appropriate piece to the view dictionary
    if #available(iOS 11, *) {
        views["topGuide"] = self.view.safeAreaLayoutGuide.topAnchor
    }else{
        views["topGuide"] = self.topLayoutGuide
    }

    //Make the constraint using visual format language
    let leftVertical = NSLayoutConstraint.constraints(withVisualFormat: "V:[topGuide][left]|", options: [], metrics: nil, views: views)

    //Add the new constraint
    self.view.addConstraints(vertical)

我之所以喜欢视觉格式语言，是因为在某些情况下您可以用更少的代码添加很多约束.

The reason I like visual format language is because you a can add lot of constraints with less code in some cases.

有什么想法吗?

推荐答案

我想使用Apples视觉格式语言将视图限制为新的《安全区域布局指南》

I want to use Apples visual format language to constrain a view to the new Safe Area Layout Guide

不能.无法通过视觉格式语言访问安全区域布局指南.我已经对此提交了一个错误，建议您也这样做.

You can't. There is no access to the safe area layout guide through the visual format language. I've filed a bug on this, and I suggest you do the same.

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