时间戳

首页 > 解决方案 > 如果我将 UIToolBar 作为子视图添加到我的 UIPickerView，是否需要向我的 UIToolBar 添加约束？

swift - 如果我将 UIToolBar 作为子视图添加到我的 UIPickerView，是否需要向我的 UIToolBar 添加约束？

问题描述

我正在尝试以UIPickerView编程方式向我的添加一个简单的“完成”按钮，而不使用情节提要。

当我尝试添加toolBar为 的子视图时UIPickerView，工具栏甚至不显示，并且出现一些与约束相关的错误。

关于如何将按钮添加到 PickerView 的任何想法？

这是我的代码片段：

var timerImage = UIButton()
var timer = Timer()
var timerDisplayed = 0
let image1 = UIImage(named: "stopwatch")
let timePicker = UIPickerView()
let timeSelect : [String] = ["300","240","180","120","90","60","45","30","15"]

let toolBar = UIToolbar()
let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(ThirdViewController.dismissKeyboard))

func pickerViewConstraints(){
    timePicker.anchor(top: nil, leading: view.safeAreaLayoutGuide.leadingAnchor, bottom: view.safeAreaLayoutGuide.bottomAnchor, trailing: view.safeAreaLayoutGuide.trailingAnchor)
}

@objc func timeClock(){
    toolBar.setItems([doneButton], animated: true)
    toolBar.sizeToFit()
    toolBar.isTranslucent = false
    toolBar.isUserInteractionEnabled = true
    toolBar.barStyle = .default

    view.addSubview(timePicker)
    timePicker.addSubview(toolBar)
    pickerViewConstraints()
    timePicker.backgroundColor = .white

    DispatchQueue.main.async {
        self.timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.Action), userInfo: nil, repeats: true)
        self.timerImage.setImage(nil, for: .normal)
    }
}

标签： swiftxcodeconstraintspickerview

解决方案

不，您不需要添加约束。它可以像：

let space = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
let doneButton = UIBarButtonItem(title: buttonTitle, style: .done, target: self, action: #selector(doneButtonAction))
let cancelButton = UIBarButtonItem(title: cancelTitle, style: .plain, target: self, action: #selector(cancelButtonAction))
let barAccessory = UIToolbar(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: 44))
barAccessory.barStyle = .default
barAccessory.isTranslucent = true
barAccessory.barTintColor = .blue
barAccessory.setItems([cancelButton, space, doneButton], animated: false)
picker.addSubview(barAccessory)
self.view.bringSubviewToFront(picker)

希望能帮助到你...

推荐阅读