iphone 如何显示菜单并且实现copy操作

1。首先要显示  菜单

 

      

//首先让自己变成第一响应
[self becomeFirstResponder];
//获得menu Controller
UIMenuController  * copyMenuController=[UIMenuController sharedMenuController];

//设置显示位置
[copyMenuController setTargetRect:CGRectMake(15, 15, 100, 50) inView:self.view];
//显示
[copyMenuController setMenuVisible:YES animated:YES];

 

 

2。然后要让自己这个ViewController能够变成 firstResponder

 

响应：- (BOOL) canBecomeFirstResponder

 

    

- (BOOL) canBecomeFirstResponder
{
    return  YES;
}

 

 

3。响应：- (BOOL) canPerformAction:(SEL)action withSender:(id)sender

 

    

- (BOOL) canPerformAction:(SEL)action withSender:(id)sender
{
    BOOL retValue = NO;
    if (action == @selector(copy:))
    {
        NSLog(@"canPerformAction");
        retValue = YES;
    }
    else if (action == @selector(paste:))
    {
        NSLog(@"canPerformAction");
        retValue = NO;
    }
    else
    {
        retValue = [super canPerformAction:action withSender:sender];
    }

    return retValue;
}

 

 

  4。执行拷贝操作

 

  

//执行拷贝操作
- (void)copy:(id)sender
{
       UIPasteboard *gpBoard=[UIPasteboard generalPasteboard];
       if (gpBoard)
       {
          NSString  *copytext=@"text";
          [gpBoard setString:copytext];
       }

}

 

   上面的代码，就是将 “text”这个字符串放到了系统粘贴板中。