我正在通过制作iPhone应用程序来学习
Swift.我遇到的问题涉及实现UIPickerView.我有一个按钮,如果按下该按钮,应该使UIPickerView从屏幕底部上升到主视图上的设定长度.然后,当用户从UIPickerView中选择一个项目时,UIPickerView会从主视图中下降,直到再次调用它为止.
我正在尝试复制的一个很好的例子就是当你在Clock应用程序中添加一个警报时,没有视图覆盖所有内容而没有标签和没有开关.
我也想让我从PickerView中选择的项目触发一个功能,但我认为这将是在我遇到这个障碍之后.
这是我到目前为止的相关代码.
@IBOutlet weak var pickerContainer: UIView!
@IBOutlet weak var pickerView: UIPickerView!
let picker_values = ["val 1","val 2","val 3","val 4"];
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func buttonPressed(sender: AnyObject) {
print("pressing a die!");
}
提前致谢！
解决方法
好的,你可以通过使用UITextField来做到这一点
第01步： –
添加UITextField.选择您看不见的板样式并将色调设置为白色/透明色.
第02步： –
然后在UITextField的顶部添加一个UIButton,添加相同的宽度高度和约束.这是stroy board层次结构,
第03步： –
然后将BUTTON和TextField连接到此类函数： –
将按钮连接到这个@IBAction func按钮(发送方：AnyObject),并将UITextField连接到@IBAction func textField(sender：UITextField).
import UIKit
class ViewController: UIViewController,UITextFieldDelegate,UIPickerViewDataSource,UIPickerViewDelegate {
@IBOutlet weak var textFeild: UITextField!
let picker_values = ["val 1","val 4"]
var myPicker: UIPickerView! = UIPickerView()
override func viewDidLoad() {
super.viewDidLoad()
self.myPicker = UIPickerView(frame: CGRectMake(0,40,0))
self.textFeild.delegate = self
self.myPicker.delegate = self
self.myPicker.dataSource = self
// 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.
}
//MARK: - Delegates and data sources
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView,numberOfRowsInComponent component: Int) -> Int {
return picker_values.count
}
//MARK: Delegates
func pickerView(pickerView: UIPickerView,titleForRow row: Int,forComponent component: Int) -> String? {
return picker_values[row]
}
func pickerView(pickerView: UIPickerView,didSelectRow row: Int,inComponent component: Int) {
//Your Function
print("Hello")
}
@IBAction func button(sender: AnyObject) {
self.textFeild.becomeFirstResponder()
}
func cancelPicker(sender:UIButton) {
//Remove view when select cancel
self.textFeild.resignFirstResponder() // To resign the inputView on clicking done.
}
@IBAction func textField(sender: UITextField) {
//Create the view
let tintColor: UIColor = UIColor(red: 101.0/255.0,green: 98.0/255.0,blue: 164.0/255.0,alpha: 1.0)
let inputView = UIView(frame: CGRectMake(0,self.view.frame.width,240))
myPicker.tintColor = tintColor
myPicker.center.x = inputView.center.x
inputView.addSubview(myPicker) // add date picker to UIView
let doneButton = UIButton(frame: CGRectMake(100/2,100,50))
doneButton.setTitle("Done",forState: UIControlState.Normal)
doneButton.setTitle("Done",forState: UIControlState.Highlighted)
doneButton.setTitleColor(tintColor,forState: UIControlState.Normal)
doneButton.setTitleColor(tintColor,forState: UIControlState.Highlighted)
inputView.addSubview(doneButton) // add Button to UIView
doneButton.addTarget(self,action: "doneButton:",forControlEvents: UIControlEvents.TouchUpInside) // set button click event
let cancelButton = UIButton(frame: CGRectMake((self.view.frame.size.width - 3*(100/2)),50))
cancelButton.setTitle("Cancel",forState: UIControlState.Normal)
cancelButton.setTitle("Cancel",forState: UIControlState.Highlighted)
cancelButton.setTitleColor(tintColor,forState: UIControlState.Normal)
cancelButton.setTitleColor(tintColor,forState: UIControlState.Highlighted)
inputView.addSubview(cancelButton) // add Button to UIView
cancelButton.addTarget(self,action: "cancelPicker:",forControlEvents: UIControlEvents.TouchUpInside) // set button click event
sender.inputView = inputView
}
}
顺便说一下,确保你UITextField发送的事件是“编辑开始”,如下所示： –
希望这会帮助你……
