Add image to UIBarButtonItem button

问题:

I have added UITabButtonItem onto my view controller using following code. Could anyone please tell me if its possible to associate image with it?

UIBarButtonItem *button = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(favouriteButtonClicked:)]; 
viewController2.navigationItem.rightBarButtonItem = button; 
[button release];
[self.navigationController pushViewController:viewController2 animated:YES];

I use following code at other places but as in above code I am pushing viewcontroller onto my current view, this code doesn't work. I had to use above code.

UIButton *button =  [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:[UIImage imageNamed:@"unselected.png"] forState:UIControlStateNormal];
[button addTarget:self action:@selector(favouriteButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
[button setFrame:CGRectMake(280, 25, 30, 30)];
viewController2.navigationController.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];

[self.navigationController pushViewController:viewController2 animated:YES];

I don't know what is wrong but when I replace this custom button code with initWithBarButtonSystemItem, it works fine!!!

Finally I sorted out this issue and posted working code here but still I don't understand if I have a button in baseviewcontroller and I add it like following, it doesn't work!!! I had to use the code given in my accepted answer in viewwillappear!!

    [favButton addTarget:self action:@selector(favouriteButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
     self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];  

Following code still doesn't work!!! Don't know what's going on.

MPMoviePlayerViewController *videoController = [[[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL URLWithString:filePath]] autorelease];

UIButton* favouritebutton =  [UIButton buttonWithType:UIButtonTypeCustom];
[favouritebutton setBackgroundImage:[UIImage imageNamed:@"unselected.png"] forState:UIControlStateNormal];
[favouritebutton addTarget:self action:@selector(favouriteButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
[favouritebutton setFrame:CGRectMake(280, 25, 30, 30)];
videoController.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:favouritebutton] autorelease]; 

[self presentMoviePlayerViewControllerAnimated:videoController];

Thanks.

回答1:

UIButton *favButton = [[UIButton alloc] init];

[favButton setImage:[UIImage imageNamed:@"unselected.png"] forState:UIControlStateNormal];
[favButton addTarget:self action:@selector(favouriteButtonClicked:)
   forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *button = [[UIBarButtonItem alloc]
                                initWithCustomView:favButton];

self.navigationItem.rightBarButtonItem = button;

[button release];
[favButton release];

回答2:

UIButton *button =  [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:[UIImage imageNamed:@"image.png"] forState:UIControlStateNormal];
 [button addTarget:self action:@selector(methodAction:) forControlEvents:UIControlEventTouchUpInside];
[button setFrame:CGRectMake(0, 0, 49, 30)];
 navController.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];

Assign it to the navigation controller and also you can set image as described in my code above.

回答3:

All right. Finally I resolved this. Thank you Maggie and Praveen. Only following code works correctly for me. Bits of from both of your answers :)

UIButton *button =  [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:[UIImage imageNamed:@"unselected.png"] forState:UIControlStateNormal];
[button addTarget:self action:@selector(favouriteButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
[button setFrame:CGRectMake(280, 25, 30, 30)];
self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];

Thanks.

回答4:

Maggie's great solution as applied to Swift:

let favButton = UIButton()
favButton.setImage(UIImage(named: "unselected"), forState: .Normal)
favButton.addTarget(self, action: "favouriteButtonClicked:", forControlEvents: .TouchUpInside)
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: favButton)

回答5:

You can also set directly from XIB by placing a roundrect button on toolbar then changing the image of that roundrect button and setting the button to custom type. Also make the background of the button as clear color

回答6:

Here is function in Swift that makes use of Maggie's answer:

class func returnBarButtonItemWithImage(theImageName:String, andDownImage theDownImageName:String, andSize theSize:CGFloat, withAction theAction:Selector, andTarget theTarget:AnyObject)->UIBarButtonItem? {

    if let myImage = UIImage(named:theImageName) {

        var myButton = UIButton(frame: CGRectMake(0, 0, theSize, theSize))

        myButton.setImage(myImage, forState: UIControlState.Normal)

        myButton.addTarget(theTarget, action: theAction, forControlEvents: UIControlEvents.TouchUpInside)

        if let myDownImage = UIImage(named: theDownImageName) {

            myButton.setImage(myDownImage, forState: UIControlState.Selected)
        }

        return UIBarButtonItem(customView: myButton)
    }

    return nil
}

回答7:

UIButton *button = [[UIButton alloc] init];

[button setImage:[UIImage imageNamed:@"settings"] forState:UIControlStateNormal];
[button addTarget:self action:@selector(RightBarMethod:)
    forControlEvents:UIControlEventTouchUpInside];
[button setFrame:CGRectMake(0, 0, 20, 20)];

UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc]
                           initWithCustomView:button];

self.navigationItem.rightBarButtonItem = barButtonItem;