如何使用objective-c格式化从youtube api v3 reuqest返回的持续时间？

Posted 2023-02-24

【中文标题】如何使用objective-c格式化从youtube api v3 reuqest返回的持续时间？

【英文标题】：How to format the duration returned from youtube api v3 reuqest using objective-c?

【发布时间】：2015-10-01 04:28:35

【问题描述】：

如何使用objective-c将这个时间段“PT1H20M10S”格式化为“1:20:10”？ 这是从对 youtube 的请求中返回的。它给了我一个时间段。如何将“PT1H20M10S”设置为像这样“1:20:10”在我的应用程序中可读？

【问题讨论】：

Convert string to date in my iPhone app的可能重复

这是一个重复的@user2027279 吗？ Alaa Agwa 你希望它是一个以秒为单位的实际时间，还是只是一个字符串格式？

我认为两个简单的搜索就可以给出答案，您只需要搜索如何从 NSString 解析 NSDate 以及如何格式化该日期，两者都使用 NSDateFormatter

【参考方案1】：

您可以使用以下代码：

- (NSString *)parseDuration:(NSString *)duration 
  NSInteger hours = 0;
  NSInteger minutes = 0;
  NSInteger seconds = 0;

  NSRange timeRange = [duration rangeOfString:@"T"];
  duration = [duration substringFromIndex:timeRange.location];

  while (duration.length > 1) 
    duration = [duration substringFromIndex:1];

    NSScanner *scanner = [NSScanner.alloc initWithString:duration];
    NSString *part = [NSString.alloc init];
    [scanner scanCharactersFromSet:[NSCharacterSet decimalDigitCharacterSet] intoString:&part];

    NSRange partRange = [duration rangeOfString:part];

    duration = [duration substringFromIndex:partRange.location + partRange.length];

    NSString *timeUnit = [duration substringToIndex:1];
    if ([timeUnit isEqualToString:@"H"])
      hours = [part integerValue];
    else if ([timeUnit isEqualToString:@"M"])
      minutes = [part integerValue];
    else if ([timeUnit isEqualToString:@"S"])
      seconds = [part integerValue];
  

  return [NSString stringWithFormat:@"%02d:%02d:%02d", hours, minutes, seconds];

您还可以阅读 ISO_8601 持续时间here。

【讨论】：

不错的答案。为你+1。 :D

【参考方案2】：

使用字符串扩展：

extension String

func parseVideoDurationOfYoutubeAPI(videoDuration: String?) -> String 

    var videoDurationString = videoDuration! as NSString

    var hours: Int = 0
    var minutes: Int = 0
    var seconds: Int = 0
    let timeRange = videoDurationString.rangeOfString("T")

    videoDurationString = videoDurationString.substringFromIndex(timeRange.location)
    while videoDurationString.length > 1 

        videoDurationString = videoDurationString.substringFromIndex(1)

        let scanner = NSScanner(string: videoDurationString as String) as NSScanner
        var part: NSString?

        scanner.scanCharactersFromSet(NSCharacterSet.decimalDigitCharacterSet(), intoString: &part)

        let partRange: NSRange = videoDurationString.rangeOfString(part! as String)

        videoDurationString = videoDurationString.substringFromIndex(partRange.location + partRange.length)
        let timeUnit: String = videoDurationString.substringToIndex(1)


        if (timeUnit == "H") 
            hours = Int(part as! String)!
        
        else if (timeUnit == "M") 
            minutes = Int(part as! String)!
        
        else if (timeUnit == "S") 
            seconds   = Int(part! as String)!
        
        else
        

    
    return String(format: "%02d:%02d:%02d", hours, minutes, seconds)

用法：

override func viewWillAppear(animated: Bool) 

    let youtubeVideoDurationString = "PT15M51S"
    let result_Hour_Minute_Second = youtubeVideoDurationString.parseVideoDurationOfYoutubeAPI("PT15M51S") as String

    print("result_Hour_Minute_Second: \(result_Hour_Minute_Second)")

【参考方案3】：

您可以使用扫描仪将数字提取为

NSString *answerString;

NSScanner *scanner = [NSScannerscannerWithString:originalString]; NSCharacterSet *numbers = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];

[scanner scanUpToCharactersFromSet:numbers intoString:NULL];

[scanner scanCharactersFromSet:numbers intoString:&numberString];

int number = [answerString integerValue];

【参考方案4】：

试试这个代码..我用这个代码得到了正确的输出..

  func formatDurations (sender : String) ->String
    var timeDuration : NSString!

    let string: NSString = sender
    if string.rangeOfString("H").location == NSNotFound && string.rangeOfString("M").location == NSNotFound

        if string.rangeOfString("S").location == NSNotFound 
            timeDuration = NSString(format: "00:00")
         else 
            var secs: NSString = sender
            secs = secs.substringFromIndex(secs.rangeOfString("PT").location + "PT".characters.count)
            secs = secs.substringToIndex(secs.rangeOfString("S").location)

            timeDuration = NSString(format: "00:%02d", secs.integerValue)
        
    
    else if string.rangeOfString("H").location == NSNotFound 
        var mins: NSString = sender
        mins = mins.substringFromIndex(mins.rangeOfString("PT").location + "PT".characters.count)
        mins = mins.substringToIndex(mins.rangeOfString("M").location)

        if string.rangeOfString("S").location == NSNotFound 
            timeDuration = NSString(format: "%02d:00", mins.integerValue)
         else 
            var secs: NSString = sender
            secs = secs.substringFromIndex(secs.rangeOfString("M").location + "M".characters.count)
            secs = secs.substringToIndex(secs.rangeOfString("S").location)

            timeDuration = NSString(format: "%02d:%02d", mins.integerValue, secs.integerValue)
        
     else 
        var hours: NSString = sender
        hours = hours.substringFromIndex(hours.rangeOfString("PT").location + "PT".characters.count)
        hours = hours.substringToIndex(hours.rangeOfString("H").location)

        if string.rangeOfString("M").location == NSNotFound && string.rangeOfString("S").location == NSNotFound 
            timeDuration = NSString(format: "%02d:00:00", hours.integerValue)
         else if string.rangeOfString("M").location == NSNotFound 
            var secs: NSString = sender
            secs = secs.substringFromIndex(secs.rangeOfString("H").location + "H".characters.count)
            secs = secs.substringToIndex(secs.rangeOfString("S").location)

            timeDuration = NSString(format: "%02d:00:%02d", hours.integerValue, secs.integerValue)
         else if string.rangeOfString("S").location == NSNotFound 
            var mins: NSString = sender
            mins = mins.substringFromIndex(mins.rangeOfString("H").location + "H".characters.count)
            mins = mins.substringToIndex(mins.rangeOfString("M").location)

            timeDuration = NSString(format: "%02d:%02d:00", hours.integerValue, mins.integerValue)
         else 
            var secs: NSString = sender
            secs = secs.substringFromIndex(secs.rangeOfString("M").location + "M".characters.count)
            secs = secs.substringToIndex(secs.rangeOfString("S").location)
            var mins: NSString = sender
            mins = mins.substringFromIndex(mins.rangeOfString("H").location + "H".characters.count)
            mins = mins.substringToIndex(mins.rangeOfString("M").location)

            timeDuration = NSString(format: "%02d:%02d:%02d", hours.integerValue, mins.integerValue, secs.integerValue)
        
    
    return timeDuration as String

【参考方案5】：

如果视频长度为一小时，则格式为 PT#H#M#S，如果最长为 24 小时，则格式为 P#DT#H#M#S。在下面检查我修改过的方法：

NSString *formattedDuration = @"";

NSString *durationregX = @"^(P\\d+DT)[A-Z0-9]+$";
NSPredicate *checking = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", durationregX];
BOOL isDayLengthVideo = [checking evaluateWithObject: duration];
long getDayHours = 0;

if(isDayLengthVideo)
    NSArray *sliceDuration = [duration componentsSeparatedByString:@"DT"];
    NSString *getDay = [sliceDuration[0] stringByReplacingOccurrencesOfString:@"P" withString:@""];
    getDayHours = (long)[getDay integerValue] * 24;

    formattedDuration = [[[sliceDuration[1] stringByReplacingOccurrencesOfString:@"H" withString:@":"] stringByReplacingOccurrencesOfString:@"M" withString:@":"] stringByReplacingOccurrencesOfString:@"S" withString:@""];
else
    formattedDuration = [[[[duration stringByReplacingOccurrencesOfString:@"PT" withString:@""] stringByReplacingOccurrencesOfString:@"H" withString:@":"] stringByReplacingOccurrencesOfString:@"M" withString:@":"] stringByReplacingOccurrencesOfString:@"S" withString:@""];


NSString *clean_duration = @"";
NSArray *components = [formattedDuration componentsSeparatedByString:@":"];

NSInteger loopchecker = 0;
for (NSString *component in components) 
    loopchecker++;
    clean_duration = clean_duration.length > 0 ? [NSString stringWithFormat:@"%@:", clean_duration] : clean_duration; // ""

    if(component.length < 2)
        clean_duration = loopchecker == 1 && isDayLengthVideo ? [NSString stringWithFormat:@"%ld", ([component integerValue] + getDayHours)] : [NSString stringWithFormat:@"%@0%@", clean_duration, component];
        return clean_duration;
        continue;
    
    clean_duration = [NSString stringWithFormat: @"%@%@", clean_duration, component];


return clean_duration;

【参考方案6】：

简单的 Swift 4.2 代码

    func parseDuration(videoDuration: String?) -> String 
    var hours: Int = 0
    var minutes: Int = 0
    var seconds: Int = 0

    if let videoDuration = videoDuration 
        var lastIndex = videoDuration.startIndex

        if let indexT = videoDuration.index(of: "T") 
            lastIndex = videoDuration.index(after: indexT)

            if let indexH = videoDuration.index(of: "H") 
                let hrs = String(videoDuration[lastIndex..<indexT])
                hours = Int(hrs) ?? 0
                lastIndex = videoDuration.index(after: indexH)
            

            if let indexM = videoDuration.index(of: "M") 
                let min = String(videoDuration[lastIndex..<indexM])
                minutes = Int(min) ?? 0
                lastIndex = videoDuration.index(after: indexM)
            

            if let indexS = videoDuration.index(of: "S") 
                let sec = String(videoDuration[lastIndex..<indexS])
                seconds = Int(sec) ?? 0
            
        
    
    return String(format: "%02d:%02d:%02d", hours, minutes, seconds)