|
import UIKit
class ViewController: UIViewController {
var ctimer:UIDatePicker!
var btnstart:UIButton!
var leftTime:Int = 180
var alertView:UIAlertView!
var timer:NSTimer!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
ctimer = UIDatePicker(frame:CGRectMake(0.0, 120.0, 200.0, 200.0))
self.ctimer.datePickerMode = UIDatePickerMode.CountDownTimer;
//必须为 60 的整数倍，比如设置为100，值自动变为 60
self.ctimer.countDownDuration = NSTimeInterval(leftTime);
ctimer.addTarget(self, action: "timerChanged", forControlEvents: UIControlEvents.ValueChanged)
self.view.addSubview(ctimer)
btnstart = UIButton.buttonWithType(UIButtonType.System) as! UIButton
btnstart.frame = CGRect(x:100, y:400, width:100, height:100);
btnstart.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
btnstart.setTitleColor(UIColor.greenColor(), forState:UIControlState.Disabled)
btnstart.setTitle("开始", forState:UIControlState.Normal)
btnstart.setTitle("倒计时中", forState:UIControlState.Disabled)
btnstart.clipsToBounds = true;
btnstart.layer.cornerRadius = 5;
btnstart.addTarget(self, action:"startClicked:",
forControlEvents:UIControlEvents.TouchUpInside)
self.view.addSubview(btnstart)
}
func timerChanged()
{
println("倒计时：\(self.ctimer.countDownDuration)")
}
/**
*开始倒计时按钮点击
*/
func startClicked(sender:UIButton)
{
self.btnstart.enabled = false;
// 获取该倒计时器的剩余时间
leftTime = Int(self.ctimer.countDownDuration);
// 禁用UIDatePicker控件和按钮
self.ctimer.enabled = false;
// 创建一个UIAlertView对象（警告框），并确认，倒计时开始
alertView = UIAlertView()
alertView.title = "到计时开始"
alertView.message = "倒计时开始，还有 \(leftTime) 秒..."
alertView.addButtonWithTitle("确定")
// 显示UIAlertView组件
alertView.show()
// 启用计时器，控制每秒执行一次tickDown方法
timer = NSTimer.scheduledTimerWithTimeInterval(NSTimeInterval(1),
target:self,selector:Selector("tickDown"),
userInfo:nil,repeats:true)
}
/**
*计时器每秒触发事件
**/
func tickDown()
{
alertView.message = "倒计时开始，还有 \(leftTime) 秒..."
// 将剩余时间减少1秒
leftTime -= 1;
// 修改UIDatePicker的剩余时间
self.ctimer.countDownDuration = NSTimeInterval(leftTime);
println(leftTime)
// 如果剩余时间小于等于0
if(leftTime <= 0)
{
// 取消定时器
timer.invalidate();
// 启用UIDatePicker控件和按钮
self.ctimer.enabled = true;
self.btnstart.enabled = true;
alertView.message = "时间到！"
}
}
}
|
