ios - 检查 UITextfield 只有字母没有数值

Question

我正在创建一个表单，如果有人输入数字然后显示警报，我想在名称字段中检查。

代码如下:

NSString *str = abc.text; 
NSCharacterSet *alphaSet = [NSCharacterSet alphanumericCharacterSet]; 
BOOL valid = [[str stringByTrimmingCharactersInSet:alphaSet] isEqualToString:@""]; 
if (!(valid)) 
{ 
    NSLog(@"number present"); 
} 
else 
{   
    NSLog(@"number not present"); 
}

谢谢

Answer 1

- (BOOL) textFieldShouldEndEditing:(UITextField *)textField {
if (textField == self.txt_Name) {

    if(txt_Name.text.length>0)
    {
        NSCharacterSet *s = [NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"];
        s = [s invertedSet];
        NSString *str1 = txt_Name.text;
        NSRange r = [str1 rangeOfCharacterFromSet:s];
        if (r.location != NSNotFound) {
            NSLog(@"the string contains illegal characters");
            txt_nameOFInfo.hidden =false;
            [img_name setImage:[UIImage imageNamed:@"redot.png"]];

        }
        else
        {
            txt_nameOFInfo.hidden =true;
            [img_name setImage:[UIImage imageNamed:@"gray-dot.png"]];

        }
      //  NSLog(@"value %@",txt_lastName.text);
    }

}

使用此代码并将委托(delegate)添加到您的 UItextfield 我希望它对您有用