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我有三個全局變量:如何設置一個常量在if語句的範圍之外使用?
var activeTextField = UITextField() // stores the last textFieldDidBeginEditing
var activeTextView = UITextView() // stores the last textViewDidBeginEditing
var lastTextKindIsTextView = true // indicates if the last text used is a UITextView
我想算第一個響應的文本字段或文本視圖中選定的字符數。我嘗試了這段代碼,但它不工作,因爲activeField超出了範圍。有沒有辦法做到這一點?
if lastTextKindIsTextView {
let activeField = activeTextView
} else {
let activeField = activeTextField
}
// see the length of the selected string
var strLength = 0
// don't work because activeField is out of scope:
if let textRange = activeField.selectedTextRange {
let selectedText = activeField.text(in: textRange)
strLength = (selectedText?.utf16.count)!
}
我vadian,activeTextField和activeTextView兩種不同類型的變量。 – Cue
正確,但兩種類型都符合'UITextInput'。我更新了答案。 – vadian
工作正常,謝謝! – Cue