显示视图时,我无法自动调整分段大小.他们都被挤压,like in this post,虽然这里的决议不适用.如果在将分段控件添加到导航栏的右侧项目之前添加了段(打破了代码的动态特性),则会自动调整它们的大小并在显示视图时看起来很好.

这是我的代码的精简版本,如下所示.我错过了什么？

@implementation MyController    
 
- (void)viewDidLoad {
 
    // segmentedControl is an ivar
    segmentedControl = [UISegmentedControl alloc] initWithItems:[NSArray array]];
    UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl] autorelease];
    self.navigationController.navigationBar.topItem.rightBarButtonItem = barButtonItem;
 
}
 
- (void)someMethodCalledAfterViewDidLoad {
 
    [segmentedControl insertSegmentWithTitle:@"a title"
                                     atIndex:0
                                    animated:NO];
}
 
@end