Question

我创建了一个将值转换为数组的字典。将数组打印到日志会将每个值条目打印为数组中的每个索引。将textview.text设置为相同的东西（数组中的每个索引）仅打印第一个值。

 @IBOutlet weak var snippet: UITextView!

 var selectedDictionary = ["firstKey": "firstValue", "secondKey": "secondValue"]

 var selectedArray = [String] (selectedDictionary.values)
        var numberInArray = selectedArray.count
        for var i = 0; i < selectedArray.count; i++ {
            println(selectedArray[i])
            snippet.text = selectedArray[i]

Answer 1

您不能迭代每个selectedArray值来更新TextView文本属性，因为每次for循环找到一个新值时，这将只显示数组中的最后一个值。

相反，您应该尝试使用所有selectedArray的值构建一个String，然后更新视图文本属性。

你可以这样做：

  @IBOutlet weak var snippet: UITextView!
  var selectedDictionary = ["firstKey": "firstValue", "secondKey": "secondValue"]

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    var text = ""
    var selectedArray = [String](selectedDictionary.values)
    for index in 0..<selectedArray.count {
      text += "\(selectedArray[index])\n"
    }

    snippet.text = text
  }

Answer 2

如果您希望它与日志中的显示方式完全相同，请使用：

@IBOutlet weak var snippet: UITextView!

var selectedDictionary = ["firstKey": "firstValue", "secondKey": "secondValue"]

snippet.text = String(format:"%@", selectedDictionary)

Answer 3

试试这个：

 @IBOutlet weak var snippet: UITextView!

 var selectedDictionary = ["firstKey": "firstValue", "secondKey": "secondValue"]

 var selectedArray = [String] (selectedDictionary.values)
 var numberInArray = selectedArray.count
 for var i = 0; i < selectedArray.count; i++ {
     println(selectedArray[i])
     snippet.text += selectedArray[i]
 }

Answer 4

您可以为所有值创建String，然后遍历您的字典并将每个值附加到创建的字符串，在循环结束后，您可以更新UITextView。

weak var snippet: UITextView!
var selectedDictionary = ["firstKey": "firstValue", "secondKey": "secondValue"]
var allValues: String = ""

for value in selectedDictionary.values{
   if let v = value as String?{
      allValues += v
   }
}

//set the value of your textview to 'allValues'

设置文本视图以查看Array中的所有元素

4 个答案: