如何在iPhone中使用段控制器設置時間

Question

我是iPhone編程的新手。任何人都可以告訴我，如何使用段控制器設置時間？在下面的代碼中，我已經給出了0.5次，但是現在我想要使用段控制器來設置時間。段控制器中的例子我已經採取了這樣的0.1,0.2,0.5,0.10,0.20,0.30，如果我選擇通過段控制器的數字中的任何一個，如0.10，它已經將該數字設置爲0.5。我怎樣才能做到這一點？

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval: 0.5 
       target: self 
       selector: @selector(methodName:) 
       userInfo: nil 
       repeats: YES]; 

Answer 1

一旦選擇了新的價值，invalidate老計時器並開始一個新的。

Answer 2

假設在你採取這樣0.1,0.2,0.5,0.10,0.20,0.30值段控制器實例，然後看到波紋管..

-(IBAction) segmentedControlIndexChanged{ 

    switch (self.segmentedControl.selectedSegmentIndex) { 
    case 0: 
     NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval: 0.1 
      target: self 
      selector: @selector(methodName:) 
      userInfo: nil 
      repeats: YES]; 
     break; 
    case 1: 
     NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval: 0.2 
      target: self 
      selector: @selector(methodName:) 
      userInfo: nil 
      repeats: YES]; 
     break; 
    case 2: 
     NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval: 0.5 
      target: self 
      selector: @selector(methodName:) 
      userInfo: nil 
      repeats: YES]; 
     break; 
    case 3: 
     NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval: 0.10 
      target: self 
      selector: @selector(methodName:) 
      userInfo: nil 
      repeats: YES]; 
     break; 
    case 4: 
     NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval: 0.20 
      target: self 
      selector: @selector(methodName:) 
      userInfo: nil 
      repeats: YES]; 
     break; 
    default: 
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval: 0.30 
      target: self 
      selector: @selector(methodName:) 
      userInfo: nil 
      repeats: YES]; 
     break; 

    } 
}