ios - 工具栏中的完成按钮问题

Question

我添加了一个带有完成和取消按钮的工具栏，一切正常。突然，完成和取消文本被隐藏了。按钮存在并且可点击，但没有文本。我尝试了一切，但同样的问题。

这是关于工具栏的代码：

func createDatePicker(){
    //format for datepicker display
    datePicker.datePickerMode = .date
    datePicker.minimumDate = Date()
    datePicker.backgroundColor = UIColor.white

    // ToolBar
    let toolBar = UIToolbar()
    toolBar.barStyle = UIBarStyle.default
    toolBar.isTranslucent = true
    toolBar.backgroundColor = UIColor(red: 253/255, green: 184/255, blue: 20/35, alpha: 1.0)

    //datePicker.tintColor = UIColor.blue
    toolBar.tintColor = UIColor.blue
    toolBar.sizeToFit()
    toolBar.isUserInteractionEnabled = true
    //add a done button on this toolbar

    let doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(doneClicked))
    let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
    let cancelButton = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(cancelClicked))
    toolBar.setItems([cancelButton,spaceButton,doneButton], animated: true)
    testfield.inputAccessoryView = toolBar
    testfield.inputView = datePicker

    self.view.addSubview(testfield)
}

这是结果：

标签： iosuitoolbarcancel-button

Answer 1

这是根据您的代码使用的代码，它对我来说非常好

import UIKit

class ViewController: UIViewController {

    var datePicker = UIDatePicker()
    var testfield: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()
        createDatePicker()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    func createDatePicker(){
        // TextField
        testfield = UITextField(frame: CGRect(x: 20, y: 100, width: 300, height: 40))
        testfield.placeholder = "testfiled"
        self.view.addSubview(testfield)

        //format for datepicker display
        datePicker.datePickerMode = .date
        datePicker.minimumDate = Date()
        datePicker.backgroundColor = UIColor.white

        // ToolBar
        let toolBar = UIToolbar()
        toolBar.barStyle = UIBarStyle.default
        toolBar.isTranslucent = true
        toolBar.backgroundColor = UIColor(red: 253/255, green: 184/255, blue: 20/35, alpha: 1.0)

        //datePicker.tintColor = UIColor.blue
        toolBar.tintColor = UIColor.blue
        toolBar.sizeToFit()
        toolBar.isUserInteractionEnabled = true
        //add a done button on this toolbar

        let doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(doneClicked))
        let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
        let cancelButton = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(cancelClicked))
        toolBar.setItems([cancelButton,spaceButton,doneButton], animated: true)
        testfield.inputAccessoryView = toolBar
        testfield.inputView = datePicker

    }

    @objc func doneClicked(){

    }
    @objc func cancelClicked(){

    }

}

请尝试在设备和模拟器上进行测试，或者在构建之前尝试 clean(shift+cmd+k) 项目，这在大多数情况下都有帮助。

结果