NSTimeInterval格式

Question

我想把NSTimeInterval它格式化为字符串00:00:00(小时,分钟,秒).做这个的最好方式是什么？

Answer 1

从iOS 8.0开始,现在NSDateComponentsFormatter有一种stringFromTimeInterval:方法.

[[NSDateComponentsFormatter new] stringFromTimeInterval:timeInterval];

Answer 2

"最好"是主观的.最简单的方法是:

unsigned int seconds = (unsigned int)round(myTimeInterval);
NSString *string = [NSString stringWithFormat:@"%02u:%02u:%02u",
    seconds / 3600, (seconds / 60) % 60, seconds % 60];

UPDATE

从iOS 8.0和Mac OS X 10.10(Yosemite)开始,NSDateComponentsFormatter如果需要符合语言环境的解决方案,则可以使用.例:

NSTimeInterval interval = 1234.56;
NSDateComponentsFormatter *formatter = [[NSDateComponentsFormatter alloc] init];
formatter.allowedUnits = NSCalendarUnitHour | NSCalendarUnitMinute |
    NSCalendarUnitSecond;
formatter.zeroFormattingBehavior = NSDateComponentsFormatterZeroFormattingBehaviorPad;
NSString *string = [formatter stringFromTimeInterval:interval];
NSLog(@"%@", string);
// output: 0:20:34

但是,我没有看到强制它输出两个小时的方法,所以如果这对你很重要,你需要使用不同的解决方案.

Answer 3

NSTimeInterval interval = ...;    
NSDate *date = [NSDate dateWithTimeIntervalSince1970:interval];    
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:@"HH:mm:ss"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];
NSString *formattedDate = [dateFormatter stringFromDate:date];
NSLog(@"hh:mm:ss %@", formattedDate);