UITextField - iPad上的UIKeyboardTypeDecimalPad? [英] UITextField - UIKeyboardTypeDecimalPad on iPad?
问题描述
在iPad上...
textField.keyboardType = UIKeyboardTypeDecimalPad;
...只显示常规键盘,但从顶部的数字开始(有很多下面的标点符号。)
...just shows the regular keyboard, but starting on the numbers at the top (with lots of punctuation underneath).
但是输入一个数字。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.
有没有办法让不相关的密钥消失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相应的字符。即使在iPhone上,用户也可以通过硬件键盘或通过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.
相反,实现 UITextFieldDelegate
's -textField:shouldChangeCharactersInRange:replacementString:
验证用户输入。你也可能真的不想硬编码数字0-9和句号。例如,某些语言环境中的用户使用逗号分隔小数的整数:
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:
as希望。
Alternately, you might perform validation when the user finishes entering text, in –textFieldShouldReturn:
, – textFieldShouldEndEditing:
, or – textFieldDidEndEditing:
as desired.
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