CODEWITHSUNDEEP
iosswiftuiviewshadow
Jishnu Raj T
Jishnu Raj T

Reputation: 2457

Shadow layer not resizing when UIView frame changed

Issue Image ScreenShot

class ViewController: UIViewController {
    var shadow : UIView!
    override func viewDidLoad() {
        super.viewDidLoad()
        shadow = UIView(frame: CGRect(x: 50,y: 50,width: 150,height:150))
        shadow.backgroundColor = .red
        shadow.dropShadow()
        self.view.addSubview(shadow)

    }

    @IBAction func btnActn(_ sender: Any) {self.shadow.frame = CGRect(x: 50,y: 50,width: 150,height: 50)

    }

}

extension UIView {
 func dropShadow(scale: Bool = true) {
        layer.masksToBounds = false
        layer.shadowColor = UIColor.black.cgColor
        layer.shadowOpacity = 0.5
        layer.shadowOffset = CGSize(width: 1, height: 1)
        layer.shadowRadius = 2
        layer.shadowPath = UIBezierPath(rect: bounds).cgPath
        layer.shouldRasterize = true
        layer.rasterizationScale = scale ? UIScreen.main.scale : 1
    }

}

Shadow layer not resizing when UIView frame changed, how to change equal to the frame size, this is my whole code of UIviewcontroller

Upvotes: 7

Views: 2747

Answers (3)

garg
garg

Reputation: 2727

Before calling dropShadow, first, try to call layoutIfNeeded

        @IBAction func btnActn(_ sender: Any) {
          self.shadow.frame = CGRect(x: 50,y: 50,width: 150,height: 50)
          self.shadow.layoutIfNeeded()
          self.shadow.dropShadow()
        }

Upvotes: 2

Jogendar Choudhary
Jogendar Choudhary

Reputation: 3494

You have many ways to do that:

First: In 'viewWillLayoutSubviews' method, you have to call your shadow method like this. so whenever you changed the frame then you have not worry about layers. This method will auto call whenever you have changed the view:-

override func viewWillLayoutSubviews() {
    shadow.dropShadow()
}

Second: When you are going to re-frame you view size then you have to set "true" for "autoresizesSubviews" like this:

@IBAction func btnActn(_ sender: Any) {
        self.shadow.frame = CGRect(x: 50,y: 50,width: 150,height: 50)
        self.shadow.autoresizesSubviews = true
    }

Upvotes: 2

David Pasztor
David Pasztor

Reputation: 54716

The issue is that you only draw the shadow once when the viewcontroller is loaded to memory, in viewDidLoad(). You need to call dropShadow every time you redraw the view it is linked to.

You can achieve this by calling dropShadow after changing the frame of shadow.

@IBAction func btnActn(_ sender: Any) {
    self.shadow.frame = CGRect(x: 50,y: 50,width: 150,height: 50)
    self.shadow.dropShadow()
}

Upvotes: 0

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