禁止進入

Question

必要從十進制墊鍵盤進入的UITextField時：

1. 替換點逗號
2. 禁用兩個點

我做到了的輸入，但這些條件彼此衝突：

func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool { 

if string == "," { 
    textField.text! += "." 
    return false 
} 

let dotsCount = textField.text!.componentsSeparatedByString(".").count - 1 
    if dotsCount > 0 && string == "." { 
    return false 
} 
return true 
} 

請幫忙做出決定

Answer 1

的決定是表面

func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool { 

    let dotsCount = textField.text!.componentsSeparatedByString(".").count - 1 
    if dotsCount > 0 && (string == "." || string == ",") { 
     return false 
    } 

    if string == "," { 
     textField.text! += "." 
     return false 
    } 

    return true 
}