How to make UIImageView display properly? SWIFT [duplicate] - ios

Question

I'm trying to make a UIView image for my background in swift using pattern image. The code I have works well except for the fact that I want the image to take the whole screen. My code looks like this: self.view.backgroundColor = UIColor(patternImage: UIImage(named: "backgroundImage")!)
Does anyone know how to make the background an image that will take up the whole screen, and would scale when appearing on different iPhone screen sizes?

Answer 1

Note That:
I posted this answer from my old account (which is deprecated for me and I can't access it anymore), this is my improved answer.
You can do it programmatically instead of creating an IBOutlet in each view.
just create a UIView extension (File -> New -> File -> Swift File -> name it whatever you want) and add:
extension UIView {
func addBackground() {
// screen width and height:
let width = UIScreen.mainScreen().bounds.size.width
let height = UIScreen.mainScreen().bounds.size.height
let imageViewBackground = UIImageView(frame: CGRectMake(0, 0, width, height))
imageViewBackground.image = UIImage(named: "YOUR IMAGE NAME GOES HERE")
// you can change the content mode:
imageViewBackground.contentMode = UIViewContentMode.ScaleAspectFill
self.addSubview(imageViewBackground)
self.sendSubviewToBack(imageViewBackground)
}}
Now, you can use this method with your views, for example:
override func viewDidLoad() {
super.viewDidLoad()
self.view.addBackground()
}

Answer 2

Just add your UIImageView positioned
centered and with all edges snapping to the edges. Leave it there and
click on the right bottom corner as shown below and now go ahead and
add 4 constrains to Top, Bottom, Left and Right Edges.
Now just select your image view and using the IB inspector select how
you would like your image: fill or fit as you can see as follow:

Answer 3

This is the updated answer of my previous one.
As the same approach of my previous answer, You can create an extension of UIView and add addBackground() method to it, as follows:
Remember: if you are adding it in a new .swift file, remember to add import UIKit
extension UIView {
func addBackground(imageName: String = "YOUR DEFAULT IMAGE NAME", contentMode: UIView.ContentMode = .scaleToFill) {
// setup the UIImageView
let backgroundImageView = UIImageView(frame: UIScreen.main.bounds)
backgroundImageView.image = UIImage(named: imageName)
backgroundImageView.contentMode = contentMode
backgroundImageView.translatesAutoresizingMaskIntoConstraints = false
addSubview(backgroundImageView)
sendSubviewToBack(backgroundImageView)
// adding NSLayoutConstraints
let leadingConstraint = NSLayoutConstraint(item: backgroundImageView, attribute: .leading, relatedBy: .equal, toItem: self, attribute: .leading, multiplier: 1.0, constant: 0.0)
let trailingConstraint = NSLayoutConstraint(item: backgroundImageView, attribute: .trailing, relatedBy: .equal, toItem: self, attribute: .trailing, multiplier: 1.0, constant: 0.0)
let topConstraint = NSLayoutConstraint(item: backgroundImageView, attribute: .top, relatedBy: .equal, toItem: self, attribute: .top, multiplier: 1.0, constant: 0.0)
let bottomConstraint = NSLayoutConstraint(item: backgroundImageView, attribute: .bottom, relatedBy: .equal, toItem: self, attribute: .bottom, multiplier: 1.0, constant: 0.0)
NSLayoutConstraint.activate([leadingConstraint, trailingConstraint, topConstraint, bottomConstraint])
}
}
Note that the updates for this answer are:
Swift 4 code 🙂
Adding -programatically- NSLayoutConstraints: that's because when applying what's mentioned in my previous answer, it works fine for the current device orientation, but not when the application does support both portrait/landscape modes, if the device orientation has been changed, the background imageView size will be the same (same size) and not adapts the new width/height of the device screen, so adding constraints should solve this issue.
Adding default parameters: for more flexibility, you might -sometimes- want to change the default image or even the context mode for you background:
Usage:
Assuming that you want to call it in viewDidLoad():
override func viewDidLoad() {
//...
// you can call 4 versions of addBackground() method
// 1- this will add it with the default imageName and default contextMode
view.addBackground()
// 2- this will add it with the edited imageName and default contextMode
view.addBackground(imageName: "NEW IMAGE NAME")
// 3- this will add it with the default imageName and edited contextMode
view.addBackground(contentMode: .scaleAspectFit)
// 4- this will add it with the default imageName and edited contextMode
view.addBackground(imageName: "NEW IMAGE NAME", contextMode: .scaleAspectFit)
}

Answer 4

Here are your options for scaling!
For the .contentMode property:
ScaleToFill
This will scale the image inside the image view to fill the entire boundaries of the image view.
ScaleAspectFit
This will make sure the image inside the image view will have the right aspect ratio and fit inside the image view’s boundaries.
ScaleAspectFill
This will make sure the image inside the image view will have the right aspect ratio and fill the entire boundaries of the image view.
For this value to work properly, make sure that you have set the clipsToBounds property of the imageview to true.
class SecondViewController : UIViewController {
let backgroundImage = UIImage(named: "centralPark")
var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
self.thirdChoiceField.delegate = self
self.datePicker.minimumDate = NSDate()
imageView = UIImageView(frame: view.bounds)
imageView.contentMode = .ScaleAspectFill
imageView.clipsToBounds = true
imageView.image = backgroundImage
imageView.center = view.center
view.addSubview(imageView)
self.view.sendSubviewToBack(imageView)

Answer 5

me showing my answer as which Lines of code helps me...
extension file code ....
extension UIView {
func addBackground() {
let width = UIScreen.main.bounds.size.width
let height = UIScreen.main.bounds.size.height
let imageViewBackground = UIImageView(frame: CGRect(x: 0, y: 0, width: width, height: height))
imageViewBackground.image = UIImage(named: "Your Background Image Name")
imageViewBackground.contentMode = .scaleAspectFill
self.addSubview(imageViewBackground)
self.sendSubviewToBack(imageViewBackground)
}
}
and in view controller file....
override func viewDidLoad() {
super.viewDidLoad()
view.addBackground()
}
Thank You Guys !

Answer 6

Ahmad Fayyas Solution in Swift 3.0:
func addBackground() {
let width = UIScreen.main.bounds.size.width
let height = UIScreen.main.bounds.size.height
let imageViewBackground = UIImageView(frame: CGRect(x:0, y:0, width: width, height: height))
imageViewBackground.image = UIImage(named: "YOUR IMAGE NAME GOES HERE")
// you can change the content mode:
imageViewBackground.contentMode = UIViewContentMode.scaleAspectFill
self.view.addSubview(imageViewBackground)
self.view.sendSubview(toBack: imageViewBackground)
}

Answer 7

This uses PureLayout. You could just use AutoLayout with a few more lines.
UIImageView* imgView = UIImageView(image: myUIImage)
imgView.setTranslatesAutoresizingMaskIntoConstraints(false)
self.view.addSubview(imgView)
self.view.addConstraints(imgView.autoPinEdgesToSuperviewEdgesWithInsets(UIEdgeInsetsMake(0,0,0,0))

Answer 8

I used constraints to make the image "autoLayout". I made a view to show an activity indicator (with full background image), while the view on segue is loading. The code is as follows.
var containerView: UIView = UIView()
var actionIndicator: UIActivityIndicatorView = UIActivityIndicatorView()
private func showActivityIndicator() {
///first I set the containerView and the background image
containerView.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(containerView)
adjustConstFullSize(containerView, parentView: self.view)
let backImage = UIImageView(image: UIImage(named: "AppBackImage"))
backImage.contentMode = UIViewContentMode.ScaleAspectFill
backImage.translatesAutoresizingMaskIntoConstraints = false
containerView.addSubview(backImage)
adjustConstFullSize(backImage, parentView: containerView)
////setting the spinner (activity indicator)
actionIndicator.frame = CGRectMake(0.0, 0.0, 40.0, 40.0)
actionIndicator.center = CGPointMake(containerView.bounds.size.width / 2, containerView.bounds.size.height / 2)
actionIndicator.hidesWhenStopped = true
actionIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge
containerView.insertSubview(actionIndicator, aboveSubview: backImage)
///throw the container to the main view
view.addSubview(containerView)
actionIndicator.startAnimating()
}
This is the code for the "adjustConstFullSize" function.
func adjustConstFullSize(adjustedView: UIView!, parentView: UIView!) {
let topConstraint = NSLayoutConstraint(item: adjustedView,
attribute: .Top,
relatedBy: .Equal,
toItem: parentView,
attribute: .Top,
multiplier: 1.0,
constant: 0.0)
let leftConstraint = NSLayoutConstraint(item: adjustedView,
attribute: .Leading,
relatedBy: .Equal,
toItem: parentView,
attribute: .Leading,
multiplier: 1.0,
constant: 0.0)
let rightConstraint = NSLayoutConstraint(item: adjustedView,
attribute: .Trailing,
relatedBy: .Equal,
toItem: parentView,
attribute: .Trailing,
multiplier: 1.0,
constant: 0.0)
let bottomConstraint = NSLayoutConstraint(item: adjustedView,
attribute: .Bottom,
relatedBy: .Equal,
toItem: parentView,
attribute: .Bottom,
multiplier: 1.0,
constant: 0.0)
parentView.addConstraints([topConstraint, leftConstraint, rightConstraint, bottomConstraint])
}
In the function shown above, I "tied" the containerView constraints to the main view constraints, making the view "full size". I did the same for the UIImageView and also set the contentMode to AspectFill - this is crucial, because we want the image to fill the content without stretching.
To remove the view, after the lazy loading, just use the code below.
private func hideActivityIndicator() {
actionIndicator.stopAnimating()
containerView.removeFromSuperview()
}

Answer 9

For this, I think you'll need to create a UIImageView that is pinned to the parent views top / bottom / left / right. This will make the UIImageView always the match the size of the display. Just make sure you set the content mode on the imageview to be AspectFit
var newImgThumb : UIImageView
newImgThumb = UIImageView(view.bounds)
newImgThumb.contentMode = .ScaleAspectFit
view.addSubview(newImgThumb)
//Don't forget this line
newImgThumb.setTranslatesAutoresizingMaskIntoConstraints(false)
NSDictionary *views =NSDictionaryOfVariableBindings(newImgThumb);
// imageview fills the width of its superview
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"|[newImgThumb]|" options:0 metrics:metrics views:views]];
// imageview fills the height of its superview
[self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:#"V:|[newImgThumb]|" options:0 metrics:metrics views:views]];

Answer 10

`
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
CGFloat screenHeight = screenRect.size.height;
_imgBackGround.frame = CGRectMake(0, 0, screenWidth, screenHeight);`