SwiftUI - UITextField 中的状态更改导致 frameWidth 不受控制地增长并忽略边界/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 并连接到 UITextField(我需要分配 firstResponder).我使用这里的代码: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?

以下代码更新我的@Binding var.这当然是预期的行为.问题是这会导致 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 并仍然将 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

你需要在 makeUIView 中降低内容阻力的优先级(这样内容不会推送在 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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