越來越excepected表達錯誤

Question

當我excuting這個代碼獲得異常錯誤在for循環我。怎麼能夠克服這個problem.please建議我

for (int i = [timeArray count] - 1; i >= 0; i–) { 
     int timeComponent = [[timeArray objectAtIndex:i] intValue]; 
     switch (i) { 
      case 3: 
       hours = timeComponent; 
       break; 
      case 2: 
       minutes = timeComponent; 
       break; 
      case 1: 
       seconds = timeComponent; 
       break; 
      case 0: 
       hundredths = timeComponent; 
       hundredths++; 
       break; 

      default: 
       break; 
     } 

    } 
    if (hundredths == 100) { 
     seconds++; 
     hundredths = 0; 
    } 
    else if (seconds == 60) { 
     minutes++; 
     seconds = 0; 
     minutes = 0; 
    } 
    self.hr.text = [NSString stringWithFormat:@"%.0d", hours]; 
    self.min.text = [NSString stringWithFormat:@"%.2d", minutes]; 
    } 

。 三江源提前

Answer 1

更改您的for循環

for (int i = [timeArray count] - 1; i >= 0; i-–) { 
     int timeComponent = [[timeArray objectAtIndex:i] intValue]; 

Answer 2

你不是遞減的值i（異）。而你想使用遞減運算符，但（i-）這不是遞減運算符。所以請跟着我

for (int i = [timeArray count] - 1; i >= 0; i–-) // ----- here your problem use i-- instead of i- 
{ 
}