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];

}

}