问题描述

我想使用 Apple 的视觉格式语言将视图限制为新的 SafeiOS 11 中的区域布局指南.但是，我得到一个例外:

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)

我喜欢可视化格式语言的原因是因为在某些情况下你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 Apple 的视觉格式语言将视图约束到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

你不能.无法通过视觉格式语言访问安全区域布局指南.我已经提交了一个错误，我建议你也这样做.

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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