Question

当我点击文字字段时，我的当前应用程序有效，它会调出UIPickerView，但如果我自己点击图像（手势放在图像上）会怎么样？

class SomeVC: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
  @IBOutlet weak var inputLabel: UITextField!
  @IBOutlet weak var laImageGestureTapped: UITapGestureRecognizer!

  let demoPicker = UIPickerView()

  // viewDidLoad()
  inputLabel.inputView = demoPicker // All is well with this.

  // How to open the UIPickerView with laImageGestureTapped?

  // I have omitted the required functions for: numberOfRowsInComponent, viewForRow, didSelectRow, numberOfComponents etc
}

我是searching with the correct words吗？

我想要的只是在点击图像时显示选择器。我并不担心didSelectRow因为会有一个隐藏的标签来做x，y和z。

如果已经提出并回答了这个问题，请指导我。感谢。

Answer 1

这是在图像上放置明文字段的另一种方法：

创建一个按钮，将图像分配给其背景图像属性
使用屏幕框架
为您的按钮创建一个IBAction，将pickerView调用到屏幕上并创建一个点按手势并添加您的视图
创建点按手势在触发时会调用的方法，这会将pickerView从屏幕上移回来

以下是相关代码：

class VC: UIViewController {
    var pickerView = UIPickerView()

    override func viewDidLoad() {
        super.viewDidLoad()
    ...
        pickerView = UIPickerView(frame: CGRect(x: 0, y: self.view.bounds.height, width: self.view.bounds.width, height: 100)) //Step 2

    }

    @IBAction func buttonPressed(sender: UIButton){ //Step 3

        UIView.animate(withDuration: 0.3, animations: {
            self.pickerView.frame = CGRect(x: 0, y: self.view.bounds.size.height - self.pickerView.bounds.size.height, width: self.pickerView.bounds.size.width, height: self.pickerView.bounds.size.height)
    })
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(doneWithPickerView))
        view.addGestureRecognizer(tapGesture)

    }

    func doneWithPickerView() { //Step 4

        UIView.animate(withDuration: 0.3, animations: {
            self.pickerView.frame = CGRect(x: 0, y: self.view.bounds.size.height, width: self.pickerView.bounds.size.width, height: self.pickerView.bounds.size.height)
        })
    }
}

我认为一般来说，不使用隐形视图会更好，因为它们可能会给您的后来造成麻烦。希望这会有所帮助。

在Gesture Tapped上显示UIPickerView

1 个答案: