arrays - 索引超出范围将日期转换为字符串组件

Question

我知道这是一个微不足道的错误，但我无法弄清楚，我被卡住了。
我想为 UISegmentedControl(有 6 个段)分配第一个段中的当前日期和下一个段中接下来的 5 天日期，如下图所示。为此，我需要从日期构造一个字符串数组，但我在这一行 let dayString = dateFormatter.shortWeekdaySymbols[dayComponent-1]

得到索引超出范围

var stringDates = [String]()
override func viewDidLoad() {
    super.viewDidLoad()


//for each segment, construct a string date with the currentDate() being first
    for i in 1...6 {

        let dateFormatter = DateFormatter()

        let today = Date()
        let calendar = Calendar.current

        if i == 1 {
           let dayComponent = Calendar.current.component(.day,from: today)
             let dayString = dateFormatter.shortWeekdaySymbols[dayComponent-1]  
               let month = Calendar.current.component(.month, from: today)
                let monthSymbol = dateFormatter.shortMonthSymbols[month-1]

                   let dayMonthString = dayString + monthSymbol
                         stringDates.append(dayMonthString)
        } else {
           var components = DateComponents()
           components.weekday = i
            let nextDay = calendar.date(byAdding: components, to: today)
              let dayComponent = Calendar.current.component(.day,from: nextDay!)
                let dayString = dateFormatter.shortWeekdaySymbols[dayComponent-1]

            let month = Calendar.current.component(.month, from: nextDay!)
              let monthSymbol = dateFormatter.shortMonthSymbols[month-1]
               let dayMonthString = dayString + monthSymbol
                  stringDates.append(dayMonthString)
         }          
    }
  }

Answer 1

在 let dayComponent = Calendar.current.component(.day,from: today) 中使用 .weekday 而不是 .day，如图所示下面:

let today = Date()
let dateFormatter = DateFormatter()
let dayComponent = Calendar.current.component(.weekday,from: today)
let dayString = dateFormatter.shortWeekdaySymbols[dayComponent - 1]  //Fri