根据屏幕尺寸设置UIImageView宽度

Question

I am trying to set an image's width to 75% of the screen width and positioned in the middle.

1. I've tried to get the screen size
2. I've tried to assign the size.width to my image

class ViewController: UIViewController {

    @IBOutlet weak var logo: UIImageView!

    var sSize: CGRect = UIScreen.mainScreen().bounds
    let sWidth = sSize.width
    var image = UIImage(named: "logo");
    image = sWidth * 0.75

    @IBAction func btnPlay(sender: AnyObject) {
        logo.hidden = true
    }

}

Answer 1

This following line shouldn't compile:

image = sWidth * 0.75

Since image is a UIImage and not a CGFloat! (sWidth is CGFloat)

Change your code as follow:

class ViewController: UIViewController {
    @IBOutlet weak var logo: UIImageView!
}

And in the storyboard use autolayout:

add a these constraints between the imageView and the viewController's view:

1. equal height
2. equal width with multiplier of 0.75

Also -> try using the storyboard more: add the image to the imageView through the storyboard.

if you don't want to do this, add it in code inside viewDidLoad.