缓慢加载图像作为CALayer的内容

Question

I have i custom UIView and i'm setting an image to the contents of a layer. in the first time the UIViewController loads it takes 2-3 seconds for the image to appear.

Why is this happening? and how can i fix it.

CODE:

var buttonImage: UIImage = UIImage(named: "circleArrow")!

override func layoutSubviews() {
    super.layoutSubviews()
    self.setupView()
}

func setupView(){
    layer.contents = buttonImage.CGImage
}

Thanks

Answer 1

When you set the contents, try calling setNeedsDisplay on your layer right away. If this doesn't work, try the same for your view.