声明：此方法我在那里看见过，不是原创，忘记以前看见过的地址了，由于最近整理一下东西，觉得这个有必要blog 一下

光标 可以左右 移动

C70196F19ACB968A99D66C8A1C5E735D.png

A5B0B790E91617E011646218C2FB3689.png

4C3FF2E8BC9E0F7E018EE5F21DC879E6.png

//隐藏系统键盘
_inputTextField.inputView = [[UIView alloc]initWithFrame:CGRectZero];

1）BaseTextField 基类
1> 禁止粘贴 选择 等等
<pre>
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender {
UIMenuController menuController = [UIMenuController sharedMenuController];
if (menuController) {
[UIMenuController sharedMenuController].menuVisible = NO;
}
return NO;
}
</pre>
2> 第二种方法
<pre>
/
//// if(action ==@selector(paste:))//禁止粘贴
//// return NO;
//// if(action ==@selector(select:))// 禁止选择
//// return NO;
//// if(action ==@selector(selectAll:))// 禁止全选
//// return NO;
////
//// return[super canPerformAction:action withSender:sender];
//
*/
</pre>
2）UITextField 的 category 主要实现
.h 这两个方法
//获取光标的位置
<pre>

• (NSRange) selectedRange;
  //设置光标位置
• (void) setSelectedRange:(NSRange) range;
  </pre>
  .m 文件
  <pre>
• (NSRange) selectedRange{
  UITextPosition* beginning = self.beginningOfDocument;
  UITextRange* selectedRange = self.selectedTextRange;
  UITextPosition* selectionStart = selectedRange.start;
  UITextPosition* selectionEnd = selectedRange.end;
  const NSInteger location = [self offsetFromPosition:beginning toPosition:selectionStart];
  const NSInteger length = [self offsetFromPosition:selectionStart toPosition:selectionEnd];
  return NSMakeRange(location, length);
  }
  // 备注：UITextField必须为第一响应者才有效
• (void) setSelectedRange:(NSRange) range {
  UITextPosition* beginning = self.beginningOfDocument;
  UITextPosition* startPosition = [self positionFromPosition:beginning offset:range.location];
  UITextPosition* endPosition = [self positionFromPosition:beginning offset:range.location + range.length];
  UITextRange* selectionRange = [self textRangeFromPosition:startPosition toPosition:endPosition];
  [self setSelectedTextRange:selectionRange];
  }
  </pre>

//使用的代码
<pre>

import "ViewController.h"

import "UITextField+ExtentRange.h"

@interface ViewController ()<UITextFieldDelegate>
{

__weak IBOutlet UITextField *_cardNumberTextField;

}
@end
@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  _cardNumberTextField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
  [_cardNumberTextField becomeFirstResponder];
  _cardNumberTextField.delegate = self;
  _cardNumberTextField.inputView = [[UIView alloc]initWithFrame:CGRectZero];
  [_cardNumberTextField setSelectedRange:NSMakeRange(0, 0)];
  }

• (IBAction)pp:(id)sender {
  UIButton *button = (UIButton *)(sender);
  //获取光标的位置
  NSRange range = [_cardNumberTextField selectedRange];
  //添加
  [_cardNumberTextField insertText:button.titleLabel.text];
  //设置光标位置
  [_cardNumberTextField setSelectedRange:NSMakeRange(range.location + 1, 0)];
  }

• (IBAction)deleteStr:(id)sender {
  if (_cardNumberTextField.text.length < 1 || [_cardNumberTextField.text isEqualToString:@""]) {
  return;
  }

  NSRange range = [_cardNumberTextField selectedRange];
  if (range.location == 0) {
  if (_cardNumberTextField.text.length > 0) {
  [_cardNumberTextField setSelectedRange:NSMakeRange(_cardNumberTextField.text.length, 0)];

        NSRange range2 = [_cardNumberTextField selectedRange];
        [_cardNumberTextField deleteBackward];
        range2.location-=1;
        [_cardNumberTextField setSelectedRange:NSMakeRange(range2.location, 0)];
        
        return;
    }else{
        return;
    }
  

  }
  [_cardNumberTextField deleteBackward];
  range.location-=1;
  [_cardNumberTextField setSelectedRange:NSMakeRange(range.location, 0)];
  }
  </pre>