EKEventEditViewController默认导航栏标题未显示

Question

我有一个关于EKEventEditViewController的奇怪问题，它不会在导航栏中显示“添加事件”标题。我使用以下代码来表示它：

[eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) {
    if (!granted) { return; }

    __block EKEvent *calEvent = [EKEvent eventWithEventStore:eventStore];
    calEvent.title = self.event.title;
    calEvent.startDate = startDate;
    calEvent.endDate = endDate;
    calEvent.location = self.event.address.title;
    [calEvent setCalendar:[eventStore defaultCalendarForNewEvents]];

    __block EKEventEditViewController *eventViewController = [[EKEventEditViewController alloc] init];
    eventViewController.editViewDelegate = self;
    eventViewController.eventStore = eventStore;
    eventViewController.event = calEvent;
    dispatch_async(dispatch_get_main_queue(), ^{
        [self presentViewController:eventViewController animated:YES completion:nil];
    });
}];

结果如下：

非常感谢任何帮助。

Answer 1

我不知道为什么会发生这种情况，但是当我在AppDelegate中添加以下外观设置时它自行修复：

NSDictionary *barTitleAppearanceDict = @{UITextAttributeFont : [UIFont fontWithName:@"HelveticaNeue" size:22.0]};
[[UINavigationBar appearance] setTitleTextAttributes:barTitleAppearanceDict];