UITextField - iPad 上的 UIKeyboardTypeDecimalPad?

时间:2023-02-16
本文介绍了UITextField - iPad 上的 UIKeyboardTypeDecimalPad?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

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 UITextFieldkeyboardType 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-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:–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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