問題描述

在 iPad 上...

On the iPad...

textField.keyboardType = UIKeyboardTypeDecimalPad;

...只顯示常規鍵盤，但從頂部的數字開始(下面有很多標點符號).

...just shows the regular keyboard, but starting on the numbers at the top (with lots of punctuation underneath).

但它是輸入一個數字.我只希望用戶能夠鍵入數字和小數點，就像 iPhone 上的 UIKeyboardTypeDecimalPad 一樣.

But it's to type in a number. I only want the users to be able to type numbers and a decimal point, like UIKeyboardTypeDecimalPad does on the iPhone.

有什么方法可以讓不相關的鍵消失并讓我的用戶獨自一人?

Is there any way to make the irrelevant keys go away and leave my user alone?

推薦答案

設置 UITextField 的 keyboardType 只會讓用戶更容易輸入適當的字符.即使在 iPhone 上，用戶也可以通過硬件鍵盤或粘貼字符串來輸入其他字符.

Setting a UITextField's keyboardType only makes it easier for a user to enter appropriate characters. Even on the iPhone, users can enter other characters via a hardware keyboard, or by pasting in a string.

改為實現 UITextFieldDelegate 的 -textField:shouldChangeCharactersInRange:replacementString: 來驗證用戶輸入.您也可能真的不想硬編碼數字 0-9 和句點.例如，某些語言環境中的用戶使用逗號將整數與小數分開:

Instead, implement UITextFieldDelegate's -textField:shouldChangeCharactersInRange:replacementString: to validate user input. You also probably don't really want to hardcode the digits 0-9 and a period. Users in some locales, for example, separate whole numbers from decimals with a comma:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSString *candidate = [[textField text] stringByReplacingCharactersInRange:range withString:string];
    if (!candidate || [candidate length] < 1 || [candidate isEqualToString:@""])
    {
        return YES;
    }
    NSDecimalNumber *number = [NSDecimalNumber decimalNumberWithString:candidate];
    if (!number || [number isEqualToNumber:[NSDecimalNumber notANumber]])
    {
        return NO;
    }
    return YES;
}

或者，您可以在用戶完成輸入文本時執行驗證，在 –textFieldShouldReturn:、–textFieldShouldEndEditing: 或 –textFieldDidEndEditing: 中根據需要.

Alternately, you might perform validation when the user finishes entering text, in –textFieldShouldReturn:, – textFieldShouldEndEditing:, or – textFieldDidEndEditing: as desired.

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