曾经被UITextField给坑一把

 UITextField *tfText = [[UITextField alloc] initWithFrame:CGRectMake(30, 150, self.view.frame.size.width-60, 40)];

    tfText.delegate = self;

    tfText.borderStyle = UITextBorderStyleRoundedRect;

   // tfText.keyboardType =  UIKeyboardTypeNumberPad;

    tfText.placeholder = @"请输入标题";

    //用这个好点，系统的很坑爹，第一位数删不掉

    [tfText addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];

    [self.view addSubview:tfText];

#pragma makr UITextFieldDelegate

- (void)textFieldDidEndEditing:(UITextField *)textField{

    NSLog(@"textField=%@",textField.text);

}

//不然键盘不退回去

- (BOOL)textFieldShouldReturn:(UITextField *)textField;

{

    [textField resignFirstResponder];//回收键盘

    return YES;

}

- (void)textFieldDidChange:(UITextField *)textField{

    NSLog(@"textField=%@",textField.text);

}

 ==============================================================================

用系统的方法，曾经在这里被坑过，到最前面一位数字的时候，死活删不掉，就这方法，坑人

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

用这个来搞，干干净净，彻彻底底解决

[tfText addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];