iPhone Objective-C以编程方式将范围按钮添加到UISearchBar

UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 44)];
[self.view addSubview:searchBar];

UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:@[@"Option 1", @"Option 2"]];
segmentedControl.frame = CGRectMake(0, 0, 150, 30);
segmentedControl.selectedSegmentIndex = 0;
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;

UIBarButtonItem *segmentedControlItem = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];
UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
searchBar.items = @[flexibleSpace, segmentedControlItem];

[segmentedControl addTarget:self action:@selector(segmentedControlValueChanged:) forControlEvents:UIControlEventValueChanged];