将浮点数转换为时间格式mm：ss [英] Convert a float into a time format mm:ss

问题描述

我正在用Objective-C搜索一种将浮点数（audioPlayer.currentTime，例如= 3.4592）转换为带有分钟和秒（03:46）的时间字符串的方法。

I'm searching a way with Objective-C to convert a float (audioPlayer.currentTime, which for example = 3.4592) into a time string with minutes and seconds (03:46)

我尝试过：

static NSDateFormatter *date_formatter = nil;
if (date_formatter == nil) {
    date_formatter = [[NSDateFormatter alloc] init];
    [date_formatter setDateFormat:@"mm:ss"];
}
NSDate *diff = [[NSDate alloc] initWithTimeIntervalSinceNow:audioPlayer.currentTime];
NSLog(@"%@", [date_formatter stringFromDate:diff]);

...但这不起作用。格式正确，但是我找不到正确初始化 diff日期的方法。

... but that's not working. The format is correct but I can't find a way to correctly initialize the "diff" date.

感谢您的帮助！

推荐答案

您可以像这样将float转换为秒

You can convert float in to seconds like this

    double d = CMTimeGetSeconds(__avPlayer.currentItem.duration);

然后将其转换为NSString以便在下面的方法中进行演示可能会帮助您

Then its matter of converting that into NSString for presentation below method might help you

- (NSString *) printSecond:(NSInteger) seconds {

    if (seconds < 60) {
        return [NSString stringWithFormat:@"00:%02d",seconds];
    }

    if (seconds >= 60) {

        int minutes = floor(seconds/60);
        int rseconds = trunc(seconds - minutes * 60);

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

    }

    return @"";

}

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