UIMenuController,UIPasteboard:复制，粘贴详细解释

首先，这四个地图。我想实现的功能。【一张照片讲一个复制到另一UIimageView上】

实现代码例如以下：

-(IBAction)panGestureTop:(UILongPressGestureRecognizer *)longPress
{

     UIMenuItem * itemPase = [[UIMenuItem alloc] initWithTitle:@"复制" action:@selector(copyimage)];
     UIMenuItem * itemTrans = [[UIMenuItem alloc] initWithTitle:@"转发" action:@selector(trans)];
     UIMenuItem * itemCollect = [[UIMenuItem alloc] initWithTitle:@"收藏" action:@selector(collect)];
     UIMenuItem * itemJoin = [[UIMenuItem alloc] initWithTitle:@"增加" action:@selector(join)];
    
    UIMenuController * menuController = [UIMenuController sharedMenuController];
    [menuController setMenuItems: @[itemPase,itemCollect,itemTrans,itemJoin]];
    
    CGPoint location = [longPress locationInView:[longPress view]];
    CGRect menuLocation = CGRectMake(location.x, location.y, 0, 0);
    [menuController setTargetRect:menuLocation inView:[longPress view]];
    menuController.arrowDirection = UIMenuControllerArrowDown;

    [menuController setMenuVisible:YES animated:YES];

}
-(BOOL)canBecomeFirstResponder
{
    return YES;
}

-(void)copyimage
{
    
    UIPasteboard * pasterBoard = [UIPasteboard pasteboardWithName:@"com.test.image" create:YES];
    pasterBoard.image = [self.topImgView image];
    
}
-(IBAction)panGestureBottom:(UILongPressGestureRecognizer *)longPress
{
    UIMenuItem * itemPase = [[UIMenuItem alloc] initWithTitle:@"粘贴" action:@selector(pase)];
    
    UIMenuController * menuController = [UIMenuController sharedMenuController];
    [menuController setMenuItems: @[itemPase]];
    
    CGPoint location = [longPress locationInView:[longPress view]];
    CGRect menuLocation = CGRectMake(location.x, location.y, 0, 0);
    [menuController setTargetRect:menuLocation inView:[longPress view]];
    menuController.arrowDirection = UIMenuControllerArrowDown;
    
    [menuController setMenuVisible:YES animated:YES];

}
-(void)pase
{
    UIPasteboard * pasterBoard = [UIPasteboard pasteboardWithName:@"com.test.image" create:NO];
    self.bottomImgView.image = pasterBoard.image;

}

复制相当于copy了一份，增加我在复制过图片之后，粘贴图片之前，把原来的那个image删除掉。则依旧能够进粘贴行。