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Xiaobian to share with you why cornerradius attributes will be invalid, I believe most people still do not know how, so share this article for everyone's reference, I hope you have a lot of harvest after reading this article, let's go to understand it together!

cornerRadius attribute borderWidth Today, use the following two sentences to add rounded corners to a view, encounter two invalid cases, record as follows, when someone finds it, take less detours self.myView.layer.cornerRadius =5.0;self.myView.layer.masksToBounds = YES.

Reason for invalid cornerRadius attribute

One: When you write this method in the controller's init method, it is invalid.

Write it in the viewDidLoaded method.

2: If I didn't write the second sentence, rounded corners still couldn't be added.

Because cornerradius is valid only if masksToBounds is yes.

But masksToBounds defaults to no,

Another thing to note is that if you set some other properties, it is possible to set this maskToBounds to yes.

For example: borderWidth

The correct posture for iOS CornerRadius

The wrong way to set rounded corners in iOS will cause off-screen rendering

m.layer.cornerRadius=8

m.layer.borderColor=UIColor.redColor().CGColor

m.layer.masksToBounds=true//This sentence will be rendered off screen early, causing the screen to stutter

Current tests address UIImageView, UILabel, and UIButton cases

classCornerRadiusLayer:CALayer{

overridefuncdisplay(){

self.contentsScale=UIScreen.mainScreen().scale

super.display()

}

varsborderWidth:CGFloat?

varscornerRadius:CGFloat?

varsborderColor:UIColor?

overridefuncdrawInContext(ctx:CGContext){

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