自定义日期组件的自定义零格式化行为

Question

我有一个计算经过时间的日期，如下所示：

let dateComponentsFormatter = DateComponentsFormatter()
dateComponentsFormatter.allowedUnits = [.hour, .minute, .second]
dateComponentsFormatter.unitsStyle = .positional
dateComponentsFormatter.zeroFormattingBehavior = .pad
if let timeElapsed = dateComponentsFormatter.string(from: startTime, to: Date()) {
    timerLabel.text = timeElapsed
}

如果过了五秒钟，它会填充所有零，使字符串显示0:00:05。但是，我希望让它说0:05五秒钟，10:05表示10分钟和5秒钟，1:10:05表示1小时10分钟和5秒钟。我怎么能这样做？

Answer 1

你可以计算字符数小于等于2然后提前追加等于这样=＆gt; “0：”+ timeElapsed

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<强>输出

var totalTime = ""
let startTime = Date().addingTimeInterval(-50)
let dateComponentsFormatter = DateComponentsFormatter()
dateComponentsFormatter.allowedUnits = [.hour, .minute, .second]
dateComponentsFormatter.unitsStyle = .positional
dateComponentsFormatter.zeroFormattingBehavior = .dropLeading
if let timeElapsed = dateComponentsFormatter.string(from: startTime, to: Date()) {
    if timeElapsed.count <= 2 {
        totalTime = "0:" + timeElapsed
    }else {
        totalTime = timeElapsed
    }
    print(totalTime)
}