时间格式转换算法: XXXXXX -> XX:XX:XX

- (NSString *)formatterDurationToString:(double)duration { int secs = (int)duration; int hour = secs/3600; int minute = (secs % 3600)/60; int sec = secs % 60; NSString *durationStr; if (hour>0) { durationStr = [NSString stringWithFormat:@"%d:%02d:%02d",hour,minute,sec]; } else { durationStr = [NSString stringWithFormat:@"%02d:%02d",minute,sec]; } return durationStr; }

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