Change Size of Uibarbuttonitem (Image) in Swift 3

Change size of UIBarButtonItem (image) in Swift 3

In the end I did it like this and it worked:

let moreButton = UIButton(frame: CGRect(x: 0, y: 0, width: 35, height: 35))
moreButton.setBackgroundImage(UIImage(named: "ic_more_vert_3"), for: .normal)
moreButton.addTarget(self, action: #selector(TableViewController.handleMore), for: .touchUpInside)
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: moreButton)

Answer from: Change width of a UIBarButtonItem in a UINavigationBar in swift

How big should a UIBarButtonItem image be?

As of iOS 11, the Human Interface Guidelines suggest glyphs be about 25×25 points in toolbars and navigation bars, up to a maximum of about 28 points. (And the HIG should definitely be in your bookmarks if you're working on iOS apps!)

That would translate to images 25px square for older devices like iPad 2 / Mini, 50px square for most current devices like iPhone 8 or iPad, and 75px square for Retina HD devices (the iPhone 6/7/8 Plus, or iPhone X). Asset catalogs will help immensely in keeping the different asset sizes organized (and Xcode can even generate them from vector sources these days).

Change width of a UIBarButtonItem in a UINavigationBar

One approach you might consider is creating a UIBarButtonItem by calling initWithCustomView:. This is not ideal in that you don't get "selected" states out of the box AND you have to composite your bordered background (if want that look) with your button image, but with that you can more directly specify a frame for your toolbar item. If you're using text for your title instead of images you may still need add in a background image as a subview. Anyway, I'm having the same problem right now and this code works for me:

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"button-image.png"]];
imageView.frame = CGRectMake(0, 0, 43, 30);

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

self.navigationItem.leftBarButtonItem = barButtonItem;

Right now this is the only way I know of restricting the auto-sizing of the UIBarButtonItems added to the UINavigationController's navigationItem.

Or try Maggie's solution, which is more thorough than mine.

Change width of a UIBarButtonItem in a UINavigationBar in swift

// Swift 3
let backButton = UIButton(frame: CGRect(x: 0, y: 0, width: 30, height: 30))
backButton.setBackgroundImage(UIImage(named: "img"), for: .normal)
backButton.addTarget(self, action: "action:", for: .touchUpInside)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: backButton)

// Swift 2
let backButton = UIButton(frame: CGRect(x: 0, y: 0, width: 30, height: 30))
backButton.setBackgroundImage(UIImage(named: "img"), forState: .Normal)
backButton.addTarget(self, action: "action:", forControlEvents: .TouchUpInside)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: backButton)

Resize UIBarButtonItem in code

You can't resize a UIBarButtonItem as you would a UIView. What you can do is change its width property.

UIBarButtonItem *b;
// Initialize and such ...
b.width = 150.0;

This should work for a Fixed Space Bar Button Item.

Change UIBarButton image from gallery

As I understand your question. I found a solution.

Try this

func createPhotoBarButton(image: Data) {
        let barbtn = UIBarButtonItem()

        let imageView = UIImageView(frame: CGRect(x: 0.0, y: 0.0, width: 35.0, height: 35.0))

        var image = UIImage(data:image)
        if image == nil {
            image = UIImage(named: "photoIcon")?.resize(maxWidthHeight: Double(imageView.frame.size.width))
        }

        imageView.image = image
        imageView.contentMode = .scaleAspectFill
        imageView.layer.cornerRadius = imageView.frame.size.height / 2
        imageView.layer.masksToBounds = true
        imageView.clipsToBounds = true

        self.navigationItem.rightBarButtonItem = barbtn

        barbtn.customView = imageView
        barbtn.customView?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(photoTapped(_:))))
}

Resize method

extension UIImage {

    func resize(maxWidthHeight : Double)-> UIImage? {

        let actualHeight = Double(size.height)
        let actualWidth = Double(size.width)
        var maxWidth = 0.0
        var maxHeight = 0.0

        if actualWidth > actualHeight {
            maxWidth = maxWidthHeight
            let per = (100.0 * maxWidthHeight / actualWidth)
            maxHeight = (actualHeight * per) / 100.0
        }else{
            maxHeight = maxWidthHeight
            let per = (100.0 * maxWidthHeight / actualHeight)
            maxWidth = (actualWidth * per) / 100.0
        }

        let hasAlpha = true
        let scale: CGFloat = 0.0

        UIGraphicsBeginImageContextWithOptions(CGSize(width: maxWidth, height: maxHeight), !hasAlpha, scale)
        self.draw(in: CGRect(origin: .zero, size: CGSize(width: maxWidth, height: maxHeight)))

        let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
        return scaledImage
    }

}

Output

Resize UIBarButtonItem

What I can recommend you to do and what I usually do in these cases is that you create a new image that is your desired size for your image and use that image for your custom UIBarButtonItem instead. It´s tricky with the sizes when you have large images.

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