在ToolBar上添加SegmentedControl

      学习iphone这么长时间，还没怎么用过ToolBar，今天项目需求，要用到它。本以为很容易用，结果发现想在ToolBar上添加一个segmentedControl就把我难住了一下下。

      ToolBar上所有的Items都必须是UIBarButtonItem类型的，因此需要先把SegmentedControl转变成UIBarButtonItem才能加上去。

 

toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 372, 320, 44)];

UIBarButtonItem *todayItem = [[UIBarButtonItem alloc] initWithTitle:@"今日" 
style:UIBarButtonItemStyleBordered 
target:self action:@selector(backToToday)];

UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc]   
             initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace            
                         target:nil action:nil];

segmentedControl = [[UISegmentedControl alloc] initWithItems:
                        [NSArray  arrayWithObjects:@"日",@"周",@"月",nil]];
[segmentedControl setFrame:CGRectMake(0, 0, 150, 30)];
[segmentedControl setSegmentedControlStyle:UISegmentedControlStyleBar];
segmentedControl.selectedSegmentIndex = 0;
[segmentedControl addTarget:self action:@selector(segmentChanged:)  
                forControlEvents:UIControlEventValueChanged];

UIBarButtonItem *segmentItem = [[UIBarButtonItem alloc]
                           initWithCustomView:segmentedControl];

[segmentedControl release];

NSArray *array = [[NSArray alloc] initWithObjects:todayItem,spaceItem,
          segmentItem,spaceItem,nil];

[todayItem release];
[spaceItem release];
[segmentItem release];

[toolBar setItems:array];
[array release];
[self.view addSubview:toolBar];