Objective c 无法获取导航栏左侧的分段控件

我试图以编程方式将UISegementedControl添加到导航栏的左侧。我可以通过将控件设置到TimeVIEW显示在中间，如下所示。下面是我的代码

NSArray *buttonNames = [NSArray arrayWithObjects:@"One", @"Two", nil];
UISegmentedControl* segmentedControl = [[UISegmentedControl alloc]
segmentedControl.segmentedControlStyle =  UISegmentedControlStyleBar;

// instead of the following I would like to move to left side of the nav bar
self.navigationItem.titleView = segmentedControl;

非常感谢您的帮助。

您试过了吗

[[UIBarButtonItem alloc] initWithCustomView:...]

?

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更确切地说，可能是这样的

UIBarButtonItem* item = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];
self.navigationItem.leftBarButtonItem = item;
[item release];