Question

这是我的代码

- (void)viewDidLoad 
{
[super viewDidLoad];

NSArray *segmentTextContent = [NSArray arrayWithObjects:
                               NSLocalizedString(@"button1", @""),
                               NSLocalizedString(@"button2", @""),
                               NSLocalizedString(@"button3", @""), nil];

UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] nitWithItems:segmentTextContent];
segmentedControl.selectedSegmentIndex = 0;
segmentedControl.autoresizingMask = UIViewAutoresizingFlexibleWidth;
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
segmentedControl.frame = CGRectMake(0, 0, 400, 30);

self.navigationItem.titleView = segmentedControl;
[segmentedControl release];
}

显示三个按钮，但我不知道如何在按钮中设置动作，请提前感谢

Answer 1

在segmentedControl创建时添加目标，如下所示

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

在那个选择器中

-(IBAction) segmentAction:(id)sender{
    UISegmentedControl *segmentedControl = (UISegmentedControl *)sender;
        NSLog(@"Segment clicked: %d", segmentedControl.selectedSegmentIndex);
    switch (segmentedControl.selectedSegmentIndex) {
            case 0:
              self.segmentLabel.text =@"Segment 1 selected.";
              break;
            case 1:
              self.segmentLabel.text =@"Segment 2 selected.";
              break;

            default:
               break;
           }

Answer 2

你必须制作3个按钮并将它们添加到UIToolbar。

- (void)viewDidLoad
{
    [super viewDidLoad];

// create a toolbar to have the buttons at the right side of the navigationBar
    UIToolbar* toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 150, 44.01)];
    toolbar.tintColor = [UIColor clearColor];
    [toolbar setTranslucent:YES];

// create the array to hold the buttons, which then gets added to the toolbar
NSMutableArray* buttons = [[NSMutableArray alloc] initWithCapacity:3];

    // Create button1
    UIBarButtonItem *button1 = [[UIBarButtonItem alloc]
                        initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(button1Pressed)];
    [buttons addObject:button1];
    [button1 release];

    // Create button2
    UIBarButtonItem *button2 = [[UIBarButtonItem alloc]
                        initWithBarButtonSystemItem:UIBarButtonSystemItemCompose target:self action:@selector(button2Pressed)];
    [buttons addObject:button2];
    [button2 release];

    // Create button3
    UIBarButtonItem *button3 = [[UIBarButtonItem alloc]
                      initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self action:@selector(button3Pressed)];
    [buttons addObject:button3];
    [button3 release];

// stick the buttons in the toolbar
    [toolbar setItems:buttons animated:NO];
    //self.toolbarItems = buttons;
    [buttons release];

    // and put the toolbar in the nav bar
    [[self navigationItem] setRightBarButtonItem:[[[UIBarButtonItem alloc] initWithCustomView:toolbar] autorelease]];
    [toolbar release];
} 

...

 - (void)button1Pressed
{
   //do stuff
}

 - (void)button2Pressed
{
   //do stuff
}

 - (void)button3Pressed
{
   //do stuff
}

如何在导航栏中的多个按钮中设置操作

2 个答案: