如何解决Interface Builder Xcode中的stackview错误问题？

Question

I have a really strange bug found in Xcode's Interface Builder, and I hope someone else can tell me how to fix it, or at least tell me I'm not the only one.

When I try to add an UILabel and UITextview inside a stackView using the Interface Builder, the stack view will be stretch with a width of infinite. For my UITextView I disabled the scroll and edit functions.

Before:

This is after I combine both elements inside a StackView :

When I use two UILabels and add those inside a StackView it's working correctly.

Answer 1

将堆栈视图本身的尾随和前导约束添加到超级视图或关闭具有明确定义的约束的项目应解决该问题

Answer 2

You need to add minimum 3 (most of the cases 4) constraints to your views in order to use autolayout.

example code:

    [label.topAnchor constraintEqualToAnchor: self.topAnchor].active = YES;
    [label.bottomAnchor constraintEqualToAnchor: self.bottomAnchor].active = YES;
    [label.leadingAnchor constraintEqualToAnchor: self.leadingAnchor].active = YES;
    [label.trailingAnchor constraintEqualToAnchor: self.trailingAnchor].active = YES;