iOS输入框限制输入内容和输入长度

限制输入框输入长度

[TextFiled addTarget:self action:@selector(textfieldDidChange:) forControlEvents:UIControlEventEditingChanged];

[self.TextField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
-(void)textFieldDidChange:(UITextField *)textField

{

    NSUInteger maxLength =11;

    NSString*toBeString = textField.text;

    //获取高亮部分

    UITextRange*selectedRange = [textFieldmarkedTextRange];

    UITextPosition*position = [textFieldpositionFromPosition:selectedRange.startoffset:0];

    if(!position || !selectedRange)

    {

        if(toBeString.length> maxLength)

        {

            NSRangerangeIndex = [toBeStringrangeOfComposedCharacterSequenceAtIndex:maxLength];

            if(rangeIndex.length==1)

            {

                textField.text= [toBeStringsubstringToIndex:maxLength];

            }

            else

            {

                NSRangerangeRange = [toBeStringrangeOfComposedCharacterSequencesForRange:NSMakeRange(0, maxLength)];

                textField.text= [toBeStringsubstringWithRange:rangeRange];

            }

        }

    }

}

限制输入框输入内容

//数字

#define NUM @"0123456789"

//字母

#define ALPHA @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"

//数字和字母

#define ALPHANUM @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"

#pragma mark -- UITextFieldDelegate

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

    //数字和字母

    NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:ALPHANUM] invertedSet];

    //数字

    //NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:NUM] invertedSet];

    //字母

    //NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:ALPHA] invertedSet];

    NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];

    return[stringisEqualToString:filtered];

}