How to make image weight and height fill screen in Swift Xcode? - ios

Question

I found a code to make slide in swift, but cant find, how to make the IMAGE fill the whole screen.
Could you help?
here is the screenshot of slider, and you will see the anchors I placed on it to show you, the whole screen.
and here is the code of it;
import UIKit
class OnboardingController: UIViewController, UIScrollViewDelegate {
let backgroundColor = UIColor(red: 241.0/255.0, green: 196.0/255.0, blue: 15.0/255.0, alpha: 1.0)
let slides = [
[ "image": "book4page1.png"],
[ "image": "book4page2.png"],
[ "image": "book4page3.png"],
]
let screen: CGRect = UIScreen.mainScreen().bounds
var scroll: UIScrollView?
var dots: UIPageControl?
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = backgroundColor
scroll = UIScrollView(frame: CGRect(x: 0.0, y: 0.0, width: screen.width, height: screen.height * 0.9))
scroll?.showsHorizontalScrollIndicator = false
scroll?.showsVerticalScrollIndicator = false
scroll?.pagingEnabled = true
view.addSubview(scroll!)
if (slides.count > 1) {
dots = UIPageControl(frame: CGRect(x: 0.0, y: screen.height * 0.875, width: screen.width, height: screen.height * 0.05))
dots?.numberOfPages = slides.count
view.addSubview(dots!)
}
for var i = 0; i < slides.count; ++i {
if let image = UIImage(named: slides[i]["image"]!) {
let imageView: UIImageView = UIImageView(frame: getFrame(image.size.width, iH: image.size.height, slide: i, offset: screen.height * 0.15))
imageView.image = image
scroll?.addSubview(imageView)
}
if let text = slides[i]["text"] {
let textView = UITextView(frame: CGRect(x: screen.width * 0.05 + CGFloat(i) * screen.width, y: screen.height * 0.745, width: screen.width * 0.9, height: 100.0))
textView.text = text
textView.editable = false
textView.selectable = false
textView.textAlignment = NSTextAlignment.Center
textView.font = UIFont.systemFontOfSize(20, weight: 0)
textView.textColor = UIColor.whiteColor()
textView.backgroundColor = UIColor.clearColor()
scroll?.addSubview(textView)
}
}
scroll?.contentSize = CGSizeMake(CGFloat(Int(screen.width) * slides.count), screen.height * 0.5)
scroll?.delegate = self
dots?.addTarget(self, action: Selector("swipe:"), forControlEvents: UIControlEvents.ValueChanged)
let closeButton = UIButton()
closeButton.frame = CGRect(x: screen.width - 70, y: 20, width: 60, height: 60)
closeButton.setTitle("Skip", forState: .Normal)
closeButton.setTitleColor(UIColor(red: 0.0/255.0, green: 0.0/255.0, blue: 0.0/255.0, alpha: 0.5), forState: .Normal)
closeButton.titleLabel!.font = UIFont.systemFontOfSize(16)
closeButton.addTarget(self, action: "pressed:", forControlEvents: .TouchUpInside)
view.addSubview(closeButton)
}
func pressed(sender: UIButton!) {
self.dismissViewControllerAnimated(true) { () -> Void in
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func getFrame (iW: CGFloat, iH: CGFloat, slide: Int, offset: CGFloat) -> CGRect {
let mH: CGFloat = screen.height * 0.50
let mW: CGFloat = screen.width
var h: CGFloat
var w: CGFloat
let r = iW / iH
if (r <= 1) {
h = min(mH, iH)
w = h * r
} else {
w = min(mW, iW)
h = w / r
}
return CGRectMake(
max(0, (mW - w) / 2) + CGFloat(slide) * screen.width,
max(0, (mH - h) / 2) + offset,
w,
h
)
}
func swipe(sender: AnyObject) -> () {
if let scrollView = scroll {
let x = CGFloat(dots!.currentPage) * scrollView.frame.size.width
scroll?.setContentOffset(CGPointMake(x, 0), animated: true)
}
}
func scrollViewDidEndDecelerating(scrollView: UIScrollView) -> () {
let pageNumber = round(scrollView.contentOffset.x / scrollView.frame.size.width)
dots!.currentPage = Int(pageNumber)
}
override func preferredStatusBarStyle() -> UIStatusBarStyle {
return UIStatusBarStyle.LightContent
}
}

Answer 1

On your imageView set imageView.contentMode = UIViewContentMode.ScaleAspectFit

Answer 2

Depending on how you want it to scale you should modify the contentMode
of the UIImageView's.

Answer 3

In Objective-C you would do this (it'll be something similar in Swift):
UIImageView * iv = [UIImageView new];
iv.frame = scrollView.bounds;
iv.contentMode = UIViewContentModeScaleAspectFill;
iv.clipsToBounds = true;
iv.image = [UIImage imageNamed:#"image.jpg"];
[scrollView addSubview:iv];
The contentMode is the line you're looking for.