我使用故事板为我的项目开发 UI。有很多问题都解决了，但是这个问题让我很生气。我为 UIBarButtonItem 添加了操作：
- (IBAction)pressAddActionButton:(UIBarButtonItem *)sender {
if (_mode == itemSelect) {
LookUpTableViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"lookupTable"];
vc.key = @"title";
vc.data = [Linesheet MR_findAllSortedBy:@"title" ascending:YES];
vc.lookUpDelegate = self;
self.myPopoverController = [[UIPopoverController alloc] initWithContentViewController:vc];
[self.myPopoverController presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
} else {
self.mode = itemSelect;
}
}
如果我使用storyBoard segue 来显示popover - 一切都很好，但如果我在运行时这样做，popover 不会显示。我应该手动创建 UIBarButtonItem。
感谢帮助！！！
更新，按钮代码：
- (void)setupNavigationItems {
self.navigationController.navigationBarHidden = NO;
UIBarButtonItem *addItem;
if (_mode == itemSelect) {
addItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
target:self
action:@selector(pressAddActionButton:)];
} else {
addItem = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone
target:self
action:@selector(pressDoneButton:)];
}
[addItem setStyle:UIBarButtonItemStyleBordered];
UIBarButtonItem *separator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
target:self
action:nil];
UIBarButtonItem *action = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction
target:self
action:@selector(pressActionButton:)];
[action setStyle:UIBarButtonItemStyleBordered];
[toolbar setItems:[NSArray arrayWithObjects:separator, addItem, action, nil] animated:YES];
}