Question

在我的快捷应用程序中，我具有以下功能：

func generateTimetable() -> [String:String] {

    var dayCellTFText = [String]()

    for i in 1...7 {
        let cell = tableView.cellForRow(at: [0,i]) as! DayCell
        dayCellTFText.append(cell.timetableTextField.text!)
    }

    let timetable = ["monday":dayCellTFText[0],"thuesday":dayCellTFText[1],"wednesday":dayCellTFText[2],"thursday":dayCellTFText[3],"friday":dayCellTFText[4],"saturday":dayCellTFText[5],"sunday":dayCellTFText[6]]
    return timetable
}

当我通过例如print（generateTimetable（））调用函数时这是输出：

["thuesday": "", "wednesday": "", "saturday": "", "thursday": "", "monday": "", "friday": "", "sunday": ""]

问题在于字典的元素改变了位置！我该怎么解决？

Answer 1

对于[String : String]的返回值，使用generateTimetable()是错误的选择。如果要有序集合，则应使用数组。问题是数组包含的类型是什么？这是两种可能的解决方案：

一个元组：

func generateTimetable() -> [(String,String)] {

    var dayCellTFText = [String]()

    for i in 1...7 {
        let cell = tableView.cellForRow(at: [0,i]) as! DayCell
        dayCellTFText.append(cell.timetableTextField.text!)
    }

    let timetable = [("monday",dayCellTFText[0]),
                     ("tuesday",dayCellTFText[1]),
                     ("wednesday",dayCellTFText[2]),
                     ("thursday",dayCellTFText[3]),
                     ("friday",dayCellTFText[4]),
                     ("saturday",dayCellTFText[5]),
                     ("sunday",dayCellTFText[6])]
    return timetable
}

一个结构

struct TableEntry {
    let nameOfDay: String
    let textFieldtext: String
}

func generateTimetable() -> [TableEntry] {

    var dayCellTFText = [String]()

    for i in 1...7 {
        let cell = tableView.cellForRow(at: [0,i]) as! DayCell
       dayCellTFText.append(cell.timetableTextField.text!)
    }

    let timetable = [ TableEntry(nameOfDay: "monday", textFieldtext: dayCellTFText[0]),
                      TableEntry(nameOfDay: "tuesday", textFieldtext: dayCellTFText[0]),
                      TableEntry(nameOfDay: "wednesday", textFieldtext: dayCellTFText[0]),
                      TableEntry(nameOfDay: "thursday", textFieldtext: dayCellTFText[0]),
                      TableEntry(nameOfDay: "friday", textFieldtext: dayCellTFText[0]),
                      TableEntry(nameOfDay: "saturday", textFieldtext: dayCellTFText[0]),
                      TableEntry(nameOfDay: "sunday", textFieldtext: dayCellTFText[0]),
                      TableEntry(nameOfDay: "monday", textFieldtext: dayCellTFText[0])]
    return timetable
}

因此返回类型将固有地排序。如果您仍然想按字典的键对字典进行排序，则here是一个已经回答的问题。但这假设键已经具有数字或字母顺序（或与此相关的任何排序顺序）。但是字符串“ monday”，“ tuesday”，...，“ sunday”不是按字母顺序排列的。

快速字典自动更改元素的顺序[快速]

1 个答案: