SwiftUI-UITextField中的状态更改导致frameWidth不受控制地增长，并且忽略了边界/框架 [英] SwiftUI - State change in UITextField causes the frameWidth to grow uncontrolled and ignore bounds/frame

问题描述

我正在使用SwiftUI并桥接到UITextField(我需要分配firstResponder).我从这里使用代码: SwiftUI:如何制作TextField成为第一响应者?

I am using SwiftUI and bridge to UITextField (I need to assign firstResponder). I use the code from here: SwiftUI: How to make TextField become first responder?

以下代码更新了我的@Binding变量.这当然是预期的行为.问题在于，这将导致textField忽略框架/边界.它只是扩展并将其他元素推出视图.视图的其他部分也依赖于@State.

The following code updates my @Binding var. This of course is intended behavior. The problem is that this causes the textField to ignore the frame/ bounds. It just expands and pushes other elements out of the view. Other parts of the view are also reliant on the @State.

func textFieldDidChangeSelection(_ textField: UITextField) {
            text = textField.text ?? ""
}

如何更新@State并仍将textField保留在框架中?

How can I update the @State and still keep the textField in the frame?

推荐答案

您需要降低makeUIView中内容抵抗的优先级(这样内容就不会推送SwiftUI中设置的外部布局)，如下所示

You need to decrease priority of content resistance in makeUIView (so content would not push external layout set in SwiftUI) like below

func makeUIView(context: UIViewRepresentableContext<MyField>) -> UITextField {
    let field = UITextField(frame: .zero)
    field.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
    ...

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