iOS UITextField中禁止复制粘贴

  UITextField中有一个方法：

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender

  能够控制用户对输入框进行哪种操作：

cut: // 剪切
copy: // 拷贝
select: // 选择
selectAll: // 全选
paste: // 粘贴
delete: // 删除
_promptForReplace: // Replace...
_transliterateChinese: // 简<=>繁
_showTextStyleOptions: // B/<u>U</u>
_define: // Define
_addShortcut: // Learn...
_accessibilitySpeak: // Speak
_accessibilitySpeakLanguageSelection: // Speak...
_accessibilityPauseSpeaking: // Pause
_share: // 共享...
makeTextWritingDirectionRightToLeft: // 往右缩进
makeTextWritingDirectionLeftToRight: // 往左缩进

可以看出有很多操作都是默认开放的。如果需要禁用默写操作建议整体禁用，或者你需要用到哪些操作，就针对这些操作开放，其他的都禁止了。

代码如下：

//建议整体禁用（复制、粘贴、全选等都被禁用了）
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{

    UIMenuController *menuController = [UIMenuController sharedMenuController];
    if (menuController) {
        [UIMenuController sharedMenuController].menuVisible = NO;
    }
    return NO;
}

//选择我们需要的权限打开 - 这样可以有效的控制不必要的权限使用
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
    //此处我们选择打开粘贴功能、其他功能都禁用
    if (action == @selector(paste:))
        return YES;
    return NO;
}

注意：需要写UITextField的分类重写canPerformAction方法，再针对输入框需要的操作打开对应的权限。

demo代码如下：

#import "UITextField+SET.h"

@implementation UITextField (SET)

//选择我们需要的权限打开 - 这样可以有效的控制不必要的权限使用
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
    
    if (self.tag == 100) {
        //此处我们选择打开粘贴功能、其他功能都禁用
        if (action == @selector(paste:))
            return YES;
    }else if (self.tag == 101){
        //此处我们选择打开选择、全选、复制功能、其他功能都禁用
        if (action == @selector(copy:) || action == @selector(select:) || action == @selector(selectAll:))
            return YES;
    }
    
    return NO;
}


@end

#import "ViewController.h"

@interface ViewController ()<UITextFieldDelegate>

@property (nonatomic, strong) UITextField *pasteField;

@property (nonatomic, strong) UITextField *noneField;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    self.pasteField = [[UITextField alloc] initWithFrame:CGRectMake(20, 100, 200, 30)];
    self.pasteField.layer.borderWidth = 0.5f;
    self.pasteField.layer.borderColor = [UIColor blackColor].CGColor;
    self.pasteField.placeholder = @"只允许粘贴";
    self.pasteField.delegate = self;
    self.pasteField.tag = 100;
    [self.view addSubview:self.pasteField];
    
    self.noneField = [[UITextField alloc] initWithFrame:CGRectMake(20, 200, 200, 30)];
    self.noneField.layer.borderWidth = 0.5f;
    self.noneField.layer.borderColor = [UIColor blackColor].CGColor;
    self.noneField.placeholder = @"只允许选择、全选、复制";
    self.noneField.delegate = self;
    self.noneField.tag = 101;
    [self.view addSubview:self.noneField];
}

@end

demo git地址：https://github.com/ITHanYong/UITextField-banCopyPaste.git