有几件事。
首先,您无法更改重复的时间间隔NSTimer
- 您需要使第一个计时器无效并为新的时间间隔安排一个新的计时器。
其次,对字符串进行 >= 比较将无法实现您想要实现的目标。
最后,您和许多 Swift 程序员一样陷入了同样的坏习惯,不必要地初始化了计时器变量,随后又扔掉了这些计时器。您应该使用可选或隐式解包可选
@IBOutlet var displayTimeLabel: UILabel!
var startTime:NSDate?
var timer : NSTimer?
var timer2: NSTimer?
var time = 2.0
@IBAction func Start(sender: UIButton) {
if (self.timer2 == nil) {
self.time=2.0
self.timer2 = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: "updateTime", userInfo: nil, repeats: true)
self.startTime = NSDate()
self.timer = NSTimer.scheduledTimerWithTimeInterval(time, target: self, selector: "timer:", userInfo: nil, repeats: true)
}
}
func timer(timer: NSTimer){
//code
}
func updateTime() {
let currentTime = NSDate.timeIntervalSinceNow()
var elapsedTime = -self.startTime!.timeIntervalSinceNow()
if (elapsedTime >10.0 && self.time==2.0) {
timer.invalidate()
self.time=1.0
self.timer = NSTimer.scheduledTimerWithTimeInterval(time, target: self, selector: "timer:", userInfo: nil, repeats: true)
}
let minutes = UInt8(elapsedTime / 60.0)
elapsedTime -= (NSTimeInterval(minutes) * 60)
let seconds = UInt8(elapsedTime)
elapsedTime -= NSTimeInterval(seconds)
let fraction = UInt8(elapsedTime * 100)
displayTimeLabel.text = String(format: "%02d:%02d.%02d", minutes,seconds,fraction)
}