仅更新时间 无日期信息

Question

结构 CurrentDateView : 查看 { @State var now = Date()

let timer = Timer.publish(every: 1, on: .current, in: .common).autoconnect()

var body: some View {
    Text("\(now)")
        .onReceive(timer) {
            self.now = Date()
        }
}

}

这段代码很完美，但我需要删除日期格式。我只需要显示 HH:MM:SS

Answer 1

您可以将DateFormatter 与 Swift 5 的字符串插值一起使用。

struct ContentView: View {  @State var now = Date()

    static let timeFormat: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "h:mm:ss a zz"
        return formatter
    }()

    let timer = Timer.publish(every: 1, on: .current, in: .common).autoconnect()

    var body: some View {
        Text("\(now, formatter: Self.timeFormat)")
            .onReceive(timer) {_ in
                self.now = Date()
        }
    }
}