Question

当用户长按分组UITableView中的单元格时，我正在尝试显示自定义UIMenuController。但是，在成功检测到长按后，我似乎无法显示UIMenuController。任何帮助是极大的赞赏。

MyViewController.h
@interface MyViewController : UIViewController <UITableViewDelegate,UITableViewDataSource>
  UITableView *table;
  @property (nonatomic, retain) IBOutlet UITableView *table;
@end

在cellForRowAtIndexPath中，我附上了Long Press Gesture Recognizer

cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:SectionsTableIdentifier] autorelease];
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
    [cell addGestureRecognizer:longPress];
    [longPress release];

这是我的handleLongPress操作方法

-(void)handleLongPress:(UIGestureRecognizer *)longPress {

  if (longPress.state == UIGestureRecognizerStateBegan) {

    CGPoint pressLocation = [longPress locationInView:self.table];
    NSIndexPath *pressedIndexPath = [self.table indexPathForRowAtPoint:pressLocation];

    UIMenuItem *first = [[UIMenuItem alloc] initWithTitle:@"Save" action:@selector(saveRecent)];
    UIMenuItem *second = [[UIMenuItem alloc] initWithTitle:@"Edit" action:@selector(editQuery)];

    UIMenuController *menuController = [UIMenuController sharedMenuController];
    menuController.menuItems = [NSArray arrayWithObjects:first,second,nil];

    [menuController setTargetRect:longPress.view.frame inView:longPress.view.superview];
    [menuController setMenuVisible:YES animated:YES];
    [pressedIndexPath release];
  }
}

编辑和保存的Action方法只显示UIAlertView。我还实现了以下方法，以确保在显示UIMenuController时，仅存在“保存”和“编辑”选项

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender {

 BOOL canPerform = NO;

 if (action == @selector(saveRecent)) {
    canPerform = YES;
 }
 if (action == @selector(editQuery)) {
    canPerform = YES;
 }

 return canPerform;
}

我也声称MyViewController是第一响应者

-(BOOL)canBecomeFirstResponder {

  return YES;
}

Answer 1

我相信您需要拥有一个声明firstResponder状态的视图才能呈现UIMenuController。我没有在你的代码中看到这种情况。

我写了使用UIMenuController作为这个问题的答案的指示：

Customize UIMenuController

在UITableView中点击单元格时显示UIMenuController时出现问题

1 个答案: