ios - UIMenuController 方法 setTargetRect :inView: not working in UITableView

Question

我在我的 tableview 中显示自定义 UIMenuController

但问题是它显示在中心我想将它显示在橙色的 label 之上。为了显示在 label 之上，我做了这个 [menu setTargetRect:CGRectMake(10, 10, 0, 0) inView:self.lbl]; 下面是完整的代码。

但是如果我在没有 UITableView 的情况下显示 UIMenuController setTargetRect 就可以正常工作。

为什么 setTargetRect 不能与 UITableView 一起使用？

setTargetRect 文档说:

(a) This target rectangle (targetRect) is usually the bounding rectangle of a selection. UIMenuController positions the editing menu above this rectangle; if there is not enough space for the menu there, it positions it below the rectangle. The menu’s pointer is placed at the center of the top or bottom of the target rectangle as appropriate.

(b) Note that if you make the width or height of the target rectangle zero, UIMenuController treats the target area as a line or point for positioning (for example, an insertion caret or a single point).

(c) Once it is set, the target rectangle does not track the view; if the view moves (such as would happen in a scroll view), you must update the target rectangle accordingly.

我错过了什么？

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
}

我的自定义单元格

- (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，请在您的 View Controller 的 viewDidLoad 方法中执行此操作。

 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) 然后，添加这两个方法。并将 menuFrame inView 设置为您的单元格

-(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) 实现 tableView 委托(delegate)并实现这些方法。

- (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) 设置单元格(UITableViewCell 的子类)

 -(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"); }