2023年7月14日发(作者：)

Swift选择框（UIPickerView）的⽤法import UIKitclass ViewController: UIViewController ,UIPickerViewDelegate{var pickerView:UIPickerView!override func viewDidLoad() {dLoad() var SCREEN_WIDTH = var SCREEN_HIGHT = pickerView = UIPickerView() te = self; Row(1, inComponent: 0, animated: true) Row(2, inComponent: 1, animated: true) Row(3, inComponent: 2, animated: true) view(pickerView);

let button = UIButton(frame: CGRectMake((SCREEN_WIDTH-100)/2,200,100,30))// = oundColor = lor() le("读取", forState: .Normal) get(self, action: "getPickerViewValue", forControlEvents: .TouchUpInside) view(button)} //------设置选择框的列数为3列,继承于UIPickerViewDataSource协议------func numberOfComponentsInPickerView( pickerView: UIPickerView) -> Int{ return 3}//设置选择框的⾏数为9⾏，继承于UIPickerViewDataSource协议func pickerView(pickerView: UIPickerView,numberOfRowsInComponent component: Int) -> Int{ return 9}//设置选择框各选项的内容，继承于UIPickerViewDelegate协议func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? { return String(row)+"-"+String(component)}//触摸按钮时，获得被选中的索引func getPickerViewValue(){ let alertView = UIAlertView(); ="被选中的索引为" e=String(edRowInComponent(0)) + "-" + String(pickerView!.selectedRowInComponent(1)) + "-" + String(edRowInComponent(2)) tonWithTitle("OK") ()}//2，调整选择框的尺⼨// UIPickerView ⽤ frame 和 center 两个属性设置整个选择框的⼤⼩和位置。//如果要调整内部列的宽度，需要实现 UIPickerViewDelegate 协议类中pickerView:widthForComponent ⽅法设置//如果要调整内部⾏⾼，则需要实习上述协议类中 pickerView:rowHeightForComponent ⽅法设置// 原⽂出⾃： 转载请保留原⽂链接：/blog/cache/detail_//设置列宽func pickerView(pickerView: UIPickerView,widthForComponent component: Int) -> CGFloat{ if(0 == component){ //第⼀列变宽 return 50 }else{ //第⼆、三列变窄 return 50 return 50 } }//设置⾏⾼func pickerView(pickerView: UIPickerView,rowHeightForComponent component: Int) -> CGFloat{ return 50 }//3，将图⽚作为选择框选项//选择框选项的内容，除了可以使字符串类型的，还可以是任意UIView类型的元素。⽐如我们将选项内容设置为图⽚：// func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView {// let image = UIImage(named: "" + String(row))// let imageView = UIImageView()// = image// return imageView//

// }//4，检测响应选项的选择状态func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { //将在滑动停⽌后触发，并打印出选中列和⾏索引 print(component) print(row) }}