mac mac - 3 months ago 27
Objective-C Question

Add button to navigationbar programmatically

Hi I need to set the button on right side, in navigation bar, programatically , so that if I press the button I will perform some actions. I have created the navigation bar, programatically by

navBar=[[UINavigationBar alloc]initWithFrame:CGRectMake(0,0,320,44) ];


Similarly, I need to add the button, on the right side of this navigation bar. For that I used,


  1.  

    UIView* container = [[UIView alloc] init];

    // create a button and add it to the container
    UIButton* button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 130, 44.01)];
    [container addSubview:button];
    [button release];

    // add another button
    button = [[UIButton alloc] initWithFrame:CGRectMake(160, 0, 50, 44.01)];
    [container addSubview:button];
    [button release];

    // now create a Bar button item
    UIBarButtonItem* item = [[UIBarButtonItem alloc] initWithCustomView:container];

    // set the nav bar's right button item
    self.navigationItem.rightBarButtonItem = item;
    [item release];

  2.  

    UIImage *im;
    im=[UIImage imageNamed:@"back.png"];
    [button setImage:im forState:UIControlStateNormal];
    [im release];
    backButton = [[UIBarButtonItem alloc] initWithCustomView:button];
    [backButton setImageInsets:UIEdgeInsetsMake(0, -10,5, 5)];
    [self.navigationItem setRightBarButtonItem:backButton];

  3.  

    UIBarButtonItem *refreshItem = [[UIBarButtonItem alloc] initWithTitle:@"button" style:UIBarButtonItemStylePlain target:self action:@selector(refreshLogsAction:)];
    self.navigationItem.rightBarButtonItem = refreshItem;

    [refreshItem release];



I tried all these ways, but none is displaying the button on the right hand side.

Answer

Inside my UIViewController derived class, I am using the following inside viewDidLoad:

UIBarButtonItem *flipButton = [[UIBarButtonItem alloc] 
                               initWithTitle:@"Flip"                                            
                               style:UIBarButtonItemStyleBordered 
                               target:self 
                               action:@selector(flipView:)];
self.navigationItem.rightBarButtonItem = flipButton;
[flipButton release];

This adds a button to the right hand side with the title Flip, which calls the method:

-(IBAction)flipView

This looks very much like you #3, but it is working within my code.