CODEWITHSUNDEEP
iosswift
user3763693
user3763693

Reputation: 1385

How do set a width and height of an Image in Swift

New to Swift and iOS programming in general. I couldn't figure out how to set a width and height of an image.
For example,

  let backgroundImage = UIImage(named: "background.png")

Thanks

Upvotes: 39

Views: 126744

Answers (5)

Cimogo
Cimogo

Reputation: 1

This question is from several years ago but comes up as I was trying to resize an image. There are apparently new ways that are much easier in SWIFTUI (not UIKit). This works for me:

Image("yourImage").resizable()
                        .aspectRatio(contentMode: .fit)

Upvotes: -1

YanSte
YanSte

Reputation: 10839

You have this code, this code set width and height and save the same position. 

/**
Resize UIImageView
:param: UImage
:param: new size CGSize
:return: new UImage rezised
*/
    func imageResize (#image:UIImage, sizeChange:CGSize)-> UIImage{

        let hasAlpha = true
        let scale: CGFloat = 0.0 // Use scale factor of main screen

        // Create a Drawing Environment (which will render to a bitmap image, later)
        UIGraphicsBeginImageContextWithOptions(sizeChange, !hasAlpha, scale)

        image.drawInRect(CGRect(origin: CGPointZero, size: sizeChange))

        let scaledImage = UIGraphicsGetImageFromCurrentImageContext()

        // Clean up the Drawing Environment (created above)
        UIGraphicsEndImageContext()

        return scaledImage
    }

     let size = CGSizeMake(100, 150)

    myImageView.image! = imageResize(myImageView.image!,sizeChange: size)

Work in viewDidLoad or refresh "reloadInputViews()" your UIImageView ;-)

**

EDIT

**

Hi create this extends if you want.

Create File Extends.Swift and add this code (add import foundation where you want change height)

/**
    Extension UIView
*/
extension UIView {
    /**
    Set x Position

    :param: x CGFloat
    */
    func setX(#x:CGFloat) {
        var frame:CGRect = self.frame
        frame.origin.x = x
        self.frame = frame
    }
    /**
    Set y Position

    :param: y CGFloat
    */
    func setY(#y:CGFloat) {
        var frame:CGRect = self.frame
        frame.origin.y = y
        self.frame = frame
    }
    /**
    Set Width

    :param: width CGFloat
    */
    func setWidth(#width:CGFloat) {
        var frame:CGRect = self.frame
        frame.size.width = width
        self.frame = frame
    }
    /**
    Set Height

    :param: height CGFloat
    */
    func setHeight(#height:CGFloat) {
        var frame:CGRect = self.frame
        frame.size.height = height
        self.frame = frame
    }
}

For Use (inherits Of UIView)

inheritsOfUIView.setHeight(height: 100)
button.setHeight(height: 100)
view.setHeight(height: 100)

Upvotes: 19

Ashkan Ghodrat
Ashkan Ghodrat

Reputation: 3222

if you want to keep the aspect ratio, here is an extension method for Swift 3 :

import UIKit

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
    }

}

Upvotes: 11

odemolliens
odemolliens

Reputation: 2641

Swift 3.0 version (from @YannickSteph)

extension UIImage {

    func imageResize (sizeChange:CGSize)-> UIImage{

        let hasAlpha = true
        let scale: CGFloat = 0.0 // Use scale factor of main screen

        UIGraphicsBeginImageContextWithOptions(sizeChange, !hasAlpha, scale)
        self.draw(in: CGRect(origin: CGPoint.zero, size: sizeChange))

        let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
        return scaledImage!
    }

}

Upvotes: 19

iPatel
iPatel

Reputation: 47059

My suggestion is.

Instead of set size of image you should set size of UIImageView and then put this image on it so, size of image will be display as per your requirement.

Such like,

var imageView = UIImageView(frame: CGRectMake(100, 150, 150, 150)); // set as you want
var image = UIImage(named: "myImage.png");
imageView.image = image;
self.view.addSubview(imageView);

Upvotes: 30

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