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NSTimeInterval 格式化

发布于 2024-12-15 15:37:06 字数 79 浏览 3 评论 0原文

我想将我的 NSTimeInterval 并将其格式化为字符串 00:00:00（小时、分钟、秒）。最好的方法是什么？

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情域 2024-12-22 15:37:06

从 iOS 8.0 开始，现在有了 NSDateComponentsFormatter，它有一个 stringFromTimeInterval: 方法。

[[NSDateComponentsFormatter new] stringFromTimeInterval:timeInterval];

Since iOS 8.0 there is now NSDateComponentsFormatter which has a stringFromTimeInterval: method.

[[NSDateComponentsFormatter new] stringFromTimeInterval:timeInterval];

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做个少女永远怀春 2024-12-22 15:37:06

“最好”是主观的。最简单的方法是这样的：

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

更新

从 iOS 8.0 和 Mac OS X 10.10 (Yosemite) 开始，如果您需要符合区域设置的解决方案，可以使用 NSDateComponentsFormatter。示例：

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，我没有找到强制其输出小时两位数的方法，因此如果这对您很重要，您将需要使用不同的解决方案。

"Best" is subjective. The simplest way is this:

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

UPDATE

As of iOS 8.0 and Mac OS X 10.10 (Yosemite), you can use NSDateComponentsFormatter if you need a locale-compliant solution. Example:

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

However, I don't see a way to force it to output two digits for the hour, so if that's important to you, you'll need to use a different solution.

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北城孤痞 2024-12-22 15:37:06

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);

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);

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梦巷 2024-12-22 15:37:06

swift 4.2

extension Date {
    static func timestampString(timeInterval: TimeInterval) -> String? {
        let formatter = DateComponentsFormatter()
        formatter.unitsStyle = .positional
        formatter.zeroFormattingBehavior = .pad
        formatter.maximumUnitCount = 0
        formatter.allowedUnits = [.hour, .minute, .second]
        return formatter.string(from: timeInterval)
    }
}

测试代码：

let hour = 60 * 50 * 32
Date.timestampString(timeInterval: TimeInterval(hour))

// output "26:40:00"

更改 unitStyle 以获得不同的样式。像formatter.unitsStyle = .abbreviated获取

输出：“26h 40m 0s”

swift 4.2

extension Date {
    static func timestampString(timeInterval: TimeInterval) -> String? {
        let formatter = DateComponentsFormatter()
        formatter.unitsStyle = .positional
        formatter.zeroFormattingBehavior = .pad
        formatter.maximumUnitCount = 0
        formatter.allowedUnits = [.hour, .minute, .second]
        return formatter.string(from: timeInterval)
    }
}

Test code:

let hour = 60 * 50 * 32
Date.timestampString(timeInterval: TimeInterval(hour))

// output "26:40:00"

Change unitStyle to get different styles. like formatter.unitsStyle = .abbreviated get

output: "26h 40m 0s"

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断肠人 2024-12-22 15:37:06

@Michael Frederick 答案的 Swift 版本：

let duration: NSTimeInterval = ...
let durationDate = NSDate(timeIntervalSince1970: duration)
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(name: "UTC")
let durationString = dateFormatter.stringFromDate(durationDate)

A Swift version of @Michael Frederick's answer :

let duration: NSTimeInterval = ...
let durationDate = NSDate(timeIntervalSince1970: duration)
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(name: "UTC")
let durationString = dateFormatter.stringFromDate(durationDate)

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~没有更多了~