Question

当我单击键盘上的返回按钮时，该应用程序冻结，并且再也没有响应。我正在使用返回public static<T> Stream<T> of(T... values)的{{1}}，因为我无法使用SwiftUI在文本上创建轮廓。我正在Xcode beta 5和iPhone XR模拟器上运行它。

UIViewRepresentable

我希望单击返回按钮时，应用程序会关闭键盘，但应用程序会冻结。

Answer 1

该答案的积分转到https://github.com/valvoline/SATextField/blob/master/SATextField/ContentView.swift。没有以上消息来源，答案就不会在这里。

专业没有改变。

struct CustomTextField: View {
    @State var text: String
    @State var pos: CGPoint

    var body: some View {
        StrokeTextLabel(text: $text, changeHandler: { newString in
            self.text = newString
        }, onCommitHandler: {
            print("commitHandler")
        })
            .position(pos)
            .gesture(dragGesture)
    }

    var dragGesture : some Gesture {
        DragGesture()
            .onChanged { value in
                self.pos = value.location
                print(self.pos)
        }
    }
}

添加了UITextField和UITextFieldDelegate以使用其功能

class WrappableTextField: UITextField, UITextFieldDelegate {
    var textFieldChangedHandler: ((String)->Void)?
    var onCommitHandler: (()->Void)?

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }

    func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
        if let currentValue = textField.text as NSString? {
            let proposedValue = currentValue.replacingCharacters(in: range, with: string)
            textFieldChangedHandler?(proposedValue as String)
        }
        return true
    }

    func textFieldDidEndEditing(_ textField: UITextField) {
        onCommitHandler?()
    }
}

使用委托作为对象并添加属性。还使字符串成为Binding

struct StrokeTextLabel: UIViewRepresentable {
    private let tmpView = WrappableTextField()

    @Binding var text: String

    //var exposed to SwiftUI object init
    var changeHandler:((String)->Void)?
    var onCommitHandler:(()->Void)?

    func makeUIView(context: Context) -> UITextField {
        tmpView.delegate = tmpView
        tmpView.onCommitHandler = onCommitHandler
        tmpView.textFieldChangedHandler = changeHandler


        let attributedStringParagraphStyle = NSMutableParagraphStyle()
        attributedStringParagraphStyle.alignment = NSTextAlignment.center
        let attributedString = NSAttributedString(
            string: text,
            attributes:[
                NSAttributedString.Key.strokeColor : UIColor.white,
                NSAttributedString.Key.foregroundColor : UIColor.black,
                NSAttributedString.Key.strokeWidth : -4.0,
                NSAttributedString.Key.font: UIFont(name: "impact", size: 50.0)!
            ]
        )

        tmpView.attributedText = attributedString
        tmpView.autocorrectionType = .no
        tmpView.keyboardType = .default

        return tmpView
    }

    func updateUIView(_ uiView: UITextField, context: Context) {
        uiView.setContentHuggingPriority(.defaultHigh, for: .vertical)
        uiView.setContentHuggingPriority(.defaultLow, for: .horizontal)
    }
}

使用UIViewRepresentable在键盘上点按返回按钮时，应用程序冻结

1 个答案: