UIMenuController方法setTargetRect：inView：在UITableView的

Question

我顯示自定義UIMenuController在我tableview這樣

，但問題是，它是在中心顯示不工作我想要顯示它的頂部label這是橙色。對於在label之上顯示，我做了這個[menu setTargetRect:CGRectMake(10, 10, 0, 0) inView:self.lbl];下面是整個代碼。

但是，如果我顯示UIMenuController沒有UITableViewsetTargetRect工作正常。

爲什麼setTargetRect不適用於UITableView？

setTargetRect文件表示：

（a）本目標矩形（targetRect）通常爲一個選擇的邊界矩形 。 UIMenuController將編輯菜單定位在這個 矩形的上方;如果菜單沒有足夠的空間，那麼它將 放置在矩形下方。根據需要，菜單的指針位於目標矩形頂部或底部的 中心。

（b）注意到，如果使目標矩形 零的寬度或高度，UIMenuController治療所述目標區域的線或點爲 定位（例如，插入符或單點）。

（c）一旦設置，目標矩形不會跟蹤視圖;如果視圖移動（例如在滾動視圖中發生），則必須相應地更新 目標矩形。

我缺少什麼？

MyViewController

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 
    return 5; 
} 

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
    TheCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cid" forIndexPath:indexPath]; 

    cell.lbl.text = [NSString stringWithFormat:@"%ld", (long)indexPath.row]; 

    return cell; 
} 

- (BOOL)tableView:(UITableView *)tableView shouldShowMenuForRowAtIndexPath:(NSIndexPath *)indexPath { 
    return YES; 
} 

-(BOOL)tableView:(UITableView *)tableView canPerformAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender { 
    return YES; 
} 

- (void)tableView:(UITableView *)tableView performAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender { 
    // required 
} 

MyCustomCell

- (void)awakeFromNib { 
    // Initialization code 

    UIMenuItem *testMenuItem = [[UIMenuItem alloc] initWithTitle:@"Test" action:@selector(test:)]; 
    UIMenuController *menu = [UIMenuController sharedMenuController]; 
    [menu setMenuItems: @[testMenuItem]]; 

    [menu setTargetRect:CGRectMake(10, 10, 0, 0) inView:self.lbl]; 

    [menu update]; 
} 

- (void)setSelected:(BOOL)selected animated:(BOOL)animated { 
    [super setSelected:selected animated:animated]; 

    // Configure the view for the selected state 
} 

-(BOOL) canPerformAction:(SEL)action withSender:(id)sender { 
    return (action == @selector(copy:) || action == @selector(test:)); 
} 

/// this methods will be called for the cell menu items 
-(void) test: (id) sender { 
    NSLog(@"test"); 
} 

-(void) copy:(id)sender { 
    UIMenuController *m = sender; 
    NSLog(@"copy"); 
} 

Answer 1

1）首先，請在您的視圖控制器的viewDidLoad方法做到這一點。

UIMenuItem *testMenuItem = [[UIMenuItem alloc] initWithTitle:@"Test" 
    action:@selector(test:)]; 
[[UIMenuController sharedMenuController] setMenuItems: @[testMenuItem]]; 
[[UIMenuController sharedMenuController] update]; 

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(menuControllerWillShow:) name:UIMenuControllerWillShowMenuNotification object:nil]; 

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(menuControllerWillHide:) name:UIMenuControllerWillHideMenuNotification object:nil]; 

2）然後，添加這兩個方法。並設置menuFrame inView到您的

-(void)menuControllerWillShow:(NSNotification *)notification{ 
//Remove Will Show Notification to prevent 
// "menuControllerWillShow" function to be called multiple times 
[[NSNotificationCenter defaultCenter]removeObserver:self name:UIMenuControllerWillShowMenuNotification object:nil]; 

//Hide the Original Menu View 
UIMenuController* menuController = [UIMenuController sharedMenuController]; 
CGSize size = menuController.menuFrame.size; 
CGRect menuFrame; 
menuFrame.origin.x = self.tableView.frame.origin.x; 
menuFrame.size = size; 
[menuController setMenuVisible:NO animated:NO]; 

//Modify its target rect and show it again to prevent glitchy appearance 
    [menuController setTargetRect:menuFrame inView:cell]; 
    [menuController setMenuVisible:YES animated:YES]; 
} 

-(void)menuControllerWillHide:(NSNotification *)notification{ 
    //re-register menuControllerWillShow 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(menuControllerWillShow:) 
name:UIMenuControllerWillShowMenuNotification object:nil]; 
} 

3）實施的tableView代表和實現這些方法。

- (BOOL)tableView:(UITableView *)tableView shouldShowMenuForRowAtIndexPath:(NSIndexPath *)indexPath { 
    cell = (TableViewCell*)[tableView cellForRowAtIndexPath:indexPath]; 

    return YES; 
} 
-(BOOL)tableView:(UITableView *)tableView canPerformAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender { 
    return NO; 
} 
- (void)tableView:(UITableView *)tableView performAction:(SEL)action forRowAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender { 
    // required 
} 

4）安裝的電池（子類的UITableViewCell）與

-(BOOL) canPerformAction:(SEL)action withSender:(id)sender { 
    return (action == @selector(copy:) || action == @selector(test:)); } /// this methods will be called for the cell menu items 
-(void) test: (id) sender { 
    NSLog(@"test"); } 

-(void) copy:(id)sender { 
    NSLog(@"copy"); }