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- ///取得TextField文案的開始點
- let beginning = self.textField.beginningOfDocument
- ///新的起始點為文案的開始點往後0位
- let newStartPosition = self.textField.position(from: beginning, offset: 0)
- ///新的結束點為文案開始點後往後3位
- let newEndPosition = self.textField.position(from: beginning, offset: 3)
- ///要確定新的點都是存在的才可以設定
- if let newStartPosition = newStartPosition,
- let newEndPosition = newEndPosition{
- ///創建新的文字選擇區域
- let newSelectionRange = self.textField.textRange(from: newStartPosition, to:newEndPosition)
- ///指定新的文字選擇區域
- self.textField.selectedTextRange = newSelectionRange
- }
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