在標籤上顯示NSTimer值

Question

我的項目中有一個按鈕和一個標籤。單擊按鈕後，我需要啓動一個NSTimer，它顯示標籤上的值。例如1sec.I我不確定計時器是否返回value.is有沒有其他的方式來做到這一點？

按鈕的功能

Answer 1

點擊

{ 
     NSTimer *t; 
     t=[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(showTimer) userInfo:nil repeats:YES]; 
} 

在showTimer功能

-(void)showTimer{ 
    static int i=0; 
    static int min=0; 

    if(i>=59){ 
     i=0; 
     min++; 
    } else { 
     i++; 
    } 

    yourLabel.text=[NSString stringWithFormat:@" %d:%d ",min,i]; 
} 

Answer 2

NSTimer *aTimer = [NSTimer timerWithTimeInterval:(1) target:self selector:@selector(timerFired:) userInfo:nil repeats:YES]; 
     NSRunLoop *runner = [NSRunLoop currentRunLoop]; 
     [runner addTimer:aTimer forMode: NSDefaultRunLoopMode]; 
int i=0; 

    - (void)timerFired:(NSTimer*)theTimer 
    { 

    if(condition) 
    { 
    // timer repeat 
    // your actions 
    i++; 
     int conseconds = i % 60; 
     int conminutes = (i/60) % 60; 

     timelable.text=[NSString stringWithFormat:@"%02d:%02d", conminutes,conseconds]; 
    [theTimer isValid]; 
    } 
    else 
    { 
    // your actions 
    //timer stopped 
    [theTimer invalidate]; 
    } 
    }