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我有以下方法将持续时间(以秒为单位)格式化为格式为@“mm:ss”的字符串。每当输入特定值 60 时,此方法的行为都出乎意料:

  • 持续时间 = 59 -> @"00:59"
  • 持续时间 = 60 -> @"59:59"(预期为 @"01:00")
  • 持续时间 = 61 -> @"01:01"

方法:

+ (NSString *)formatDuration:(NSTimeInterval)duration
{    
    NSDateFormatter *durationFormatter = [[NSDateFormatter alloc] init];
    [durationFormatter setDateFormat:@"mm:ss"];

    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *zeroComponents = [[NSDateComponents alloc] init];
    zeroComponents.hour = 0;
    zeroComponents.minute = 0;
    zeroComponents.second = 0;

    NSDate *zeroDate = [calendar dateFromComponents:zeroComponents];
    [zeroComponents release];
    NSDate *endDate = [NSDate dateWithTimeInterval:duration sinceDate:zeroDate];

    return [[durationFormatter autorelease] stringFromDate:endDate];
}
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