iosUITextField输入框，几位数字后面加什么字符-创新互联

@interface ViewController ()

{

  UITextField  *  _numberFielde;

}

@end

@implementation ViewController

static NSString * NUMBER = @"0123456789";//数字

static int setNumber = 1; //几个数字加空格 1改成自己想要的字符

static NSString * kongSring = @"*";//几个数字中间加的字符 x改成自己想要的字符

- (void)viewDidLoad {

  [super viewDidLoad];

  _numberFielde = [[UITextField alloc] initWithFrame:CGRectMake(10, 100,self.view.frame.size.width-20, 35)];

  _numberFielde.layer.borderColor = [UIColor grayColor].CGColor;

  _numberFielde.layer.borderWidth = 1.0f;

  _numberFielde.delegate = self;

  [_numberFielde becomeFirstResponder];

  _numberFielde.placeholder = @"请输入数字";

  [self.view addSubview:_numberFielde];

  // Do any additional setup after loading the view, typically from a nib.

}

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

  NSCharacterSet *characterSet = [[NSCharacterSet characterSetWithCharactersInString:NUMBER] invertedSet]; //定义一个字符集合

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

  BOOL basicTest = [string isEqualToString:filtered];

  if(basicTest)

  {

   if (textField == _numberFielde)

   {

    //setNumber位加一个空格

    if ([string isEqualToString:@""]){ // 删除字符

      if ((textField.text.length - 2) % setNumber == 0) {

        textField.text = [textField.text substringToIndex:textField.text.length - 1];

      }

      return YES;

    } else {

      if (textField.text.length % setNumber == 0) {

        textField.text = [NSString stringWithFormat:@"%@%@", textField.text,kongSring];

      }

    }

    return YES;

   }

  }

  else

  {

    return NO;

  }

  return YES;

}

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