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import UIKit
class CounterViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor.whiteColor()
setupTimeLabel()
setuptimeButtons()
setupActionButtons()
remainingSeconds = 0
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
timeLabel!.frame = CGRectMake(10, 40, self.view.bounds.size.width-20, 120)
let gap = ( self.view.bounds.size.width - 10*2 - (CGFloat(timeButtons!.count) * 64) ) / CGFloat(timeButtons!.count - 1)
for (index, button) in enumerate(timeButtons!) {
let buttonLeft = 10 + (64 + gap) * CGFloat(index)
button.frame = CGRectMake(buttonLeft, self.view.bounds.size.height-120, 64, 44)
}
startStopButton!.frame = CGRectMake(10, self.view.bounds.size.height - 60, self.view.bounds.size.width-20-120, 44)
clearButton!.frame = CGRectMake(10+self.view.bounds.size.width-20-100+20, self.view.bounds.size.height-60, 80, 44)
}
///UI Element
var timeLabel: UILabel? //显示剩余时间
var timeButtons: [UIButton]? //设置时间的按钮数组
var startStopButton: UIButton? //启动/停止按钮
var clearButton: UIButton? //复位按钮
let timeButtonInfos = [("1分", 60), ("3分", 180), ("5分", 300), ("秒", 1)]
//启动或停止倒计时
//使用Swift的方式来解决状态跟UI的同步问题：使用属性的willSet或didSet方法
var isCounting: Bool = false {
willSet(newValue) {
if newValue {
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: "updateTimer:", userInfo: nil, repeats: true)
} else {
timer?.invalidate()
timer = nil
}
setSettingButtonsEnabled(!newValue)
}
}
var timer: NSTimer? // 设置定时器
//使用Swift的方式来解决状态跟UI的同步问题：使用属性的willSet或didSet方法
var remainingSeconds: Int = 0 {
willSet(newSeconds) {
let mins = newSeconds / 60
let seconds = newSeconds % 60
timeLabel!.text = NSString(format: "%02d:%02d", mins, seconds)
if newSeconds <= 0 {
isCounting = false
startStopButton!.alpha = 0.3
startStopButton!.enabled = false
} else{
startStopButton!.alpha = 1.0
startStopButton!.enabled = true
}
}
}
//UI Controls
func setupTimeLabel() {
timeLabel = UILabel()
timeLabel!.textColor = UIColor.whiteColor()
timeLabel!.font = UIFont(name: "Helvetica", size: 80)
timeLabel!.backgroundColor = UIColor.blackColor()
timeLabel!.textAlignment = NSTextAlignment.Center
self.view.addSubview(timeLabel!)
}
func setuptimeButtons() {
var buttons: [UIButton] = []
for (index, (title, _)) in enumerate(timeButtonInfos) {
let button: UIButton = UIButton()
button.tag = index //保存按钮的index
button.setTitle("\(title)", forState: UIControlState.Normal)
button.backgroundColor = UIColor.orangeColor()
button.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)
button.setTitleColor(UIColor.blackColor(), forState: UIControlState.Highlighted)
button.addTarget(self, action: "timeButtonTapped:", forControlEvents: UIControlEvents.TouchUpInside)
buttons += [button]
self.view.addSubview(button)
}
timeButtons = buttons
}
func setupActionButtons() {
//create start/stop button
startStopButton = UIButton()
startStopButton!.setTitle("启动/停止", forState: UIControlState.Normal)
startStopButton!.backgroundColor = UIColor.redColor()
startStopButton!.setTitleColor(UIColor.blackColor(), forState: UIControlState.Normal)
// 为button绑定TouchUpInside事件
startStopButton!.addTarget(self, action: "startStopButtonTapped:", forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(startStopButton!)
/////////////////////clearButton/////////////////////
clearButton = UIButton()
clearButton!.setTitle("复位", forState: UIControlState.Normal)
clearButton!.backgroundColor = UIColor.redColor()
clearButton!.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)
clearButton!.setTitleColor(UIColor.blackColor(), forState: UIControlState.Highlighted)
clearButton!.addTarget(self, action: "clearButtonTapped:", forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(clearButton!)
}
///Actions & Callbacks
func startStopButtonTapped(sender: UIButton) {
isCounting = !isCounting //切换了isCounting的状态
if isCounting {
createAndFireLocalNotificationAfterSeconds(remainingSeconds)
} else {
UIApplication.sharedApplication().cancelAllLocalNotifications()
}
}
func clearButtonTapped(sender: UIButton) {
remainingSeconds = 0 //复位按钮将时间置0
}
//累加时间
func timeButtonTapped(sender: UIButton) {
let (_, seconds) = timeButtonInfos[sender.tag]
remainingSeconds += seconds
}
func updateTimer(timer: NSTimer) {
remainingSeconds -= 1
// 弹出警告窗口,提示倒计时完成
if remainingSeconds <= 0 {
let alert = UIAlertView()
alert.title = "计时完成"
alert.message = ""
alert.addButtonWithTitle("OK")
alert.show()
}
}
///
func setSettingButtonsEnabled(enabled: Bool) {
for button in timeButtons! {
button.enabled = enabled
button.alpha = enabled ? 1.0 : 0.3
}
clearButton!.enabled = enabled
clearButton!.alpha = enabled ? 1.0 : 0.3
}
//注册系统通知
func createAndFireLocalNotificationAfterSeconds(seconds: Int) {
UIApplication.sharedApplication().cancelAllLocalNotifications()
let notification = UILocalNotification()
let timeIntervalSinceNow = Double(seconds)
notification.fireDate = NSDate(timeIntervalSinceNow:timeIntervalSinceNow);
notification.timeZone = NSTimeZone.systemTimeZone()
notification.alertBody = "计时完成！"
UIApplication.sharedApplication().scheduleLocalNotification(notification)
}
}
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