ios - 如何在 UINavigationItem 中添加 UISegmentControl ..？

Question

如何在 UINavigationItem 中添加 UISegmentedControl？我想创建一个带有段控件的 UINavigationBar，它添加在导航栏的标题中。

UISegmentedControl 有两个索引。

这是我所拥有的:

UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:[UIImage imageNamed:@"grid.png"],[UIImage imageNamed:@"list.png"],nil]];
    [segmentedControl addTarget:self action:@selector(segmentedAction) forControlEvents:UIControlEventValueChanged];
    segmentedControl.frame = CGRectMake(0, 0, 90, 40);
    segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
    segmentedControl.momentary = YES;
    [segmentedControl setTintColor:[UIColor clearColor]];

    UIBarButtonItem *segmentBarItem = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];    
    self.navigationItem.rightBarButtonItem = segmentBarItem;

我把它放在右边了。所以，也要放在导航栏中间。

这不起作用，如果我做错了什么，请告诉我。

谢谢

Answer 1

您就快完成了，您只需将分段控件添加到 UINavigationItem 并将其添加到您的 UINavigationBar:

// This code is used for a custom navigation bar

UINavigationItem* newItem = [[UINavigationItem alloc] initWithTitle:@""];
[newItem setTitleView:segmentedControl];

// Assuming you already have a navigation bar called "navigationBar"
[navigationBar setItems:[NSArray arrayWithObject:newItem] animated:NO];

// No memory leaks please...
[newItem release];

或者如果你想使用现有的 Controller

// This is used for an existing navigation controller
[navigationController.navigationBar.topItem setTitleView:segmentedControl];
// or if you want to access through the root view controller of the nav controller
[rootController.navigationItem setTitleView:segmentedControl];

这应该将导航栏的中心 View 设置为分段控件。

希望我能帮上忙!

编辑:如果您需要更多帮助，这些类的 Apple 文档非常详尽:

UINavigationItem

UINavigationBar