UIMenuController和UIMenuItem的使用

UIMenuController的方法：

1.创建menucontroller

+ (UIMenuController *)sharedMenuController;

2.设置是否可见

- (void)setMenuVisible:(BOOL)menuVisible animated:(BOOL)animated;

3.设置显示的位置

- (void)setTargetRect:(CGRect)targetRect inView:(UIView *)targetView;

4.有一个存储数据的属性：@property(nullable, nonatomic,copy) NSArray<UIMenuItem *> *menuItems；

 　用set方法来调用，例如：

[menu setMenuItems:[NSArray arrayWithObjects:copyItem,resendItem,resendItem1,resendItem2,resendItem3,nil]];


UIMenuItem的使用：

- (instancetype)initWithTitle:(NSString *)title action:(SEL)action；

例子：

//设置menucontroller的数据源

- (NSArray *)showMenuItems

{

    NSMutableArray *array = [NSMutableArray array];

    UIMenuItem *deleteItem = [[UIMenuItem alloc] initWithTitle:@"删除" action:@selector(deleteItem:)];

    [array addObject:deleteItem];

    

    if (_msg.status == EIMAMsg_SendFail)

    {

        UIMenuItem *resendItem = [[UIMenuItem alloc] initWithTitle:@"重发" action:@selector(resendItem:)];

        [array addObject:resendItem];

    }

    return array;   

}

//设置menucoller的属性

- (void)showMenu

{

    NSArray *showMenus = [self showMenuItems];

    if (showMenus.count)

    {

        [self becomeFirstResponder];

        UIMenuController *menu = [UIMenuController sharedMenuController];

        [menu setMenuItems:showMenus];

        [menu update];

        [menu setTargetRect:_contentBack.frame inView:self.contentView];

        [menu setMenuVisible:YES animated:YES];

    }

}