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如何在UIActionSheet中创建UIPickerView

在UIActionSheet中创建UIPickerView可以通过以下步骤实现:

  1. 首先,在UIActionSheet的代理方法中添加UIPickerView:
代码语言:swift
复制
func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int) {
    if buttonIndex == 0 {
        let pickerView = UIPickerView(frame: CGRect(x: 0, y: 0, width: 320, height: 216))
        pickerView.delegate = self
        pickerView.dataSource = self
        actionSheet.addSubview(pickerView)
    }
}
  1. 然后,实现UIPickerView的代理方法:
代码语言:swift
复制
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return options.count
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return options[row]
}
  1. 最后,在UIActionSheet的代理方法中添加UIPickerView的布局约束:
代码语言:swift
复制
func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int) {
    if buttonIndex == 0 {
        let pickerView = UIPickerView(frame: CGRect(x: 0, y: 0, width: 320, height: 216))
        pickerView.delegate = self
        pickerView.dataSource = self
        actionSheet.addSubview(pickerView)

        // 添加布局约束
        pickerView.translatesAutoresizingMaskIntoConstraints = false
        actionSheet.addConstraint(NSLayoutConstraint(item: pickerView, attribute: .centerX, relatedBy: .equal, toItem: actionSheet, attribute: .centerX, multiplier: 1, constant: 0))
        actionSheet.addConstraint(NSLayoutConstraint(item: pickerView, attribute: .bottom, relatedBy: .equal, toItem: actionSheet, attribute: .bottom, multiplier: 1, constant: 0))
        actionSheet.addConstraint(NSLayoutConstraint(item: pickerView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 320))
        actionSheet.addConstraint(NSLayoutConstraint(item: pickerView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 216))
    }
}

这样就可以在UIActionSheet中创建UIPickerView了。

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