onTapGesture 禁用我的选取器和分段点击答案

【问题标题】：onTapGesture disables my Picker and Segment taponTapGesture 禁用我的选取器和分段点击
【发布时间】：2020-04-15 20:25:31
【问题描述】：

我正在使用SwiftUI 创建一个Form。在我的Form 中，我有一个DatePicker、TextField 和一个SegmentedPickerStyle。

我的TextField 正在使用.decimalPad，我正在尝试找到在完成输入后关闭键盘的最佳方式。

我尝试添加.onTapGesture，但它阻止我使用任何我的选择器。当我点击它们时，没有任何反应。

这是我想要做的：

struct ContentView: View {
    @State var date = Date()

    @State var price = ""
    @State private var tipPercentage = 2

    let tipPercentages = [10, 15, 20, 25, 0]

    var body: some View {
            NavigationView {
                Form {
                    Section {
                        DatePicker(selection: $date, displayedComponents: .date) {
                            Text("Date").bold().foregroundColor(Color.init(red: 100.0/255.0, green: 208.0/255.0, blue: 100.0/255.0))
                        }

                        HStack {
                            Text("Price"))
                            Spacer()
                            TextField("required", text: $price).multilineTextAlignment(.trailing).keyboardType(.decimalPad)
                        }
                    }

                    Section(header: Text("How much tip do you want to leave?")) {
                        Picker("Tip percentage", selection: $tipPercentage) {
                            ForEach(0 ..< tipPercentages.count) {
                                Text("\(self.tipPercentages[$0])%")
                            }
                        }
                        .pickerStyle(SegmentedPickerStyle())
                    }
                }
                .onTapGesture {
                       let keyWindow = UIApplication.shared.connectedScenes
                                          .filter({$0.activationState == .foregroundActive})
                                          .map({$0 as? UIWindowScene})
                                          .compactMap({$0})
                                          .first?.windows
                                          .filter({$0.isKeyWindow}).first
                       keyWindow!.endEditing(true)

                }
            }
    }
}

【问题讨论】：

由于 iOS 15 中仍然存在此错误，因此我提交了雷达：openradar.appspot.com/radar?id=5041898704076800

标签： ios swiftui gesture picker

【解决方案1】：

删除您的 .onTapGesture 并将其添加到表单中：

.gesture(DragGesture().onChanged{_ in UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)})

【讨论】：

问题是当我想滚动到表单底部以填充文本字段时，这是不可能的......

【解决方案2】：

你会想用一些 UIKit 的东西来做到这一点。

首先，制作一个自定义手势识别器：

    class CloseKeyboardGestureRecognizer: UIGestureRecognizer {
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
        // Don't run if the tap is in a TextField, since the keyboard shouldnt hide when tapping a textfield.
        guard let touch = touches.first?.view, touch is UITextField else {
            state = .began
            return
        }
            state = .failed
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
       state = .ended
    }

    override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent) {
        state = .cancelled
    }
}

extension CloseKeyboardGestureRecognizer: UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
}

然后在SceneDelegate中，在scene(_:willConnectTo:options:)中，添加：

        let gesture = CloseKeyboardGestureRecognizer(target: window, action:#selector(UIView.endEditing))
        gesture.delegate = gesture
        gesture.cancelsTouchesInView = false
        gesture.requiresExclusiveTouchType = false

        window.addGestureRecognizer(gesture)
    }

这会获得在文本字段外点击会关闭键盘的行为，而不会影响对其他元素的点击。

【讨论】：