Ios 如何在iphone sdk中创建仅输入字符和空格的文本字段

需要建议如何使文本字段仅输入文本和空格。

请尝试以下代码

UITextField

具有委托方法名称

–textField:shouldChangeCharactersRange:replacementString:

这对您的情况很有帮助

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if(textField == yourTextFieldName)
    {
        NSCharacterSet *invalidCharSet = [[NSCharacterSet characterSetWithCharactersInString:@"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"] invertedSet]; invertedSet];
        NSString *filtered = [[string componentsSeparatedByCharactersInSet:invalidCharSet] componentsJoinedByString:@""];
        if([string isEqualToString:filtered] || [string isEqualToString:@" "])
        return YES;
    }
    else
        return NO;
}

---

请尝试以下代码段：

myCharSet=[NSCharacterSet characterSetWithCharactersInString:@“abcABC”]

`

-（BOOL）textField:（UITextField*）textField应更改字符范围：（NSRange）范围替换字符串：（NSString*）字符串{
对于（int i=0；i<[text输入的长度]；i++）{
unichar c=[textEntered characterAtIndex:i]；
如果（！[myCharSet成员：c]）{
返回否；
}
}
返回YES；}

`
一个简单易懂的教程
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range      replacementString:(NSString *)string {

for (int i = 0; i < [textEntered length]; i++) {

    unichar c = [textEntered characterAtIndex:i];
    if (![myCharSet characterIsMember:c]) {
        return NO;
    }
}
return YES;}