问题描述

在 iPad 上...

On the iPad...

textField.keyboardType = UIKeyboardTypeDecimalPad;

...只显示常规键盘，但从顶部的数字开始(下面有很多标点符号).

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

但它是输入一个数字.我只希望用户能够键入数字和小数点，就像 iPhone 上的 UIKeyboardTypeDecimalPad 一样.

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.

有什么方法可以让不相关的键消失并让我的用户独自一人?

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

推荐答案

设置 UITextField 的 keyboardType 只会让用户更容易输入适当的字符.即使在 iPhone 上，用户也可以通过硬件键盘或粘贴字符串来输入其他字符.

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.

改为实现 UITextFieldDelegate 的 -textField:shouldChangeCharactersInRange:replacementString: 来验证用户输入.您也可能真的不想硬编码数字 0-9 和句点.例如，某些语言环境中的用户使用逗号将整数与小数分开:

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，您可以在用户完成输入文本时执行验证，在 –textFieldShouldReturn:、–textFieldShouldEndEditing: 或 –textFieldDidEndEditing: 中根据需要.

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

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