如何禁用粘贴到NSSecureTextField的密码

Question

我已经做了很长时间了，尝试了两种方法。但是，都没有成功。

1. 继承NSSecureTextField并覆盖-(BOOL)becomeFirstResponder和-(void)textDidEndEditing:。

   -(BOOL) becomeFirstResponder
   {
       NSMenu *mainMenu = [[NSApplication sharedApplication]mainMenu];
       NSMenu *appMenu = [[mainMenu itemAtIndex:2]submenu];
       NSLog(@"%@", [appMenu title]);
       for (NSMenuItem *item in [appMenu itemArray]) {
           if ([[item title] isEqual: @"Paste"])
           {
               NSLog(@"%@", [item title]);
               [item setEnabled:NO];             
           }
       }
       return [super becomeFirstResponder];
   }
   
   - (void)textDidEndEditing:(NSNotification *)notification
   {
       NSMenu *mainMenu = [[NSApplication sharedApplication]mainMenu];
       NSMenu *appMenu = [[mainMenu itemAtIndex:2]submenu];
       NSLog(@"%@", [appMenu title]);
       for (NSMenuItem *item in [appMenu itemArray]) {
           if ([[item title] isEqual: @"Paste"])
           {
               NSLog(@"%@", [item title]);
               [item setEnabled:YES];             
           }
       }
   }
   

2. 将协议NSUserInterfaceValidation添加到NSSecureTextField的子类（可能它不是实现此协议的正确目标，因为此函数中的断点永远不会被触发）。

   - (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)anItem
   {
     SEL theAction = [anItem action];
     if (theAction == @selector(paste:)) {
     return NO;
     }
     return [super validateUserInterfaceItem:anItem];
   }
   

Answer 1

在textfield委托方法中检查菜单项粘贴标记值是否匹配，然后不允许将字符粘贴到下面的特定NSSecureTextField中： -

1）在屏幕截图中附上mainmenu.xib中设置menuitem粘贴的标签值，然后阻止以下方法： -

-(void)controlTextDidChange:(NSNotification *)obj
{
    NSMenu *mainMenu = [[NSApplication sharedApplication]mainMenu];
    NSMenu *appMenu = [[mainMenu itemAtIndex:2]submenu];
    BOOL isAllowPaste=YES;
    NSLog(@"%@", [appMenu title]);
    for (NSMenuItem *item in [appMenu itemArray]) {
        if ([item tag] ==1)
        {
            NSLog(@"%@", [item title]);
            isAllowPaste=NO;
        }

    }
    if (isAllowPaste==NO && [obj object]==secureTextField)
    {
            NSLog(@"Cannot paste");
           isAllowPaste=YES;
    }
    }