Removing all CALayer's sublayers

Question

I have trouble with deleting all of layer\'s sublayers. I currently do this manually, but that brings unnecessary clutter. I found many topics about this in google, but no a

Answer 1

I have faced the same issue and found many solutions but none of them are perfect.
Finally from above answer of pnavk i got the idea. At there the code is for Xamarin/C# users.
The iOS version could be as below:

Swift 2.3

    if rootLayer.sublayers?.count > 0 {
        rootLayer.sublayers?.forEach {
            if $0.name == "bottomBorderLayer" {
                $0.removeFromSuperlayer()
            }
        }
    }

    let border = CALayer()
    let height = CGFloat(1.0)

    border.borderColor = UIColor.blackColor().CGColor
    border.borderWidth = height

    border.frame = CGRectMake(0, self.frame.size.height - height, self.frame.size.width, self.frame.size.height)

    border.name = "bottomBorderLayer"
    rootLayer.addSublayer(border)
    rootLayer.masksToBounds = true

Objective-C

if (rootLayer.sublayers.count > 0) {
    for (CALayer *layer in rootLayer.sublayers) {
        if ([layer.name isEqualToString:@"bottomBorderLayer"]) {
            [layer removeFromSuperlayer];
        }
    }
}

CALayer *border = [[CALayer alloc] init];
CGFloat height = 1.0;

border.borderColor = [UIColor blackColor].CGColor;
border.borderWidth = height;

border.frame = CGRectMake(0, self.view.frame.size.height - height, self.view.frame.size.width, self.view.frame.size.height);
border.name = @"bottomBorderLayer";
[rootLayer addSublayer:border];
rootLayer.masksToBounds = TRUE;

The above code will work for bottom border only. You can change the border side as per your requirement.
Here before adding any layer to the controller, I have just run a for loop to check whether any border is already applied or not?
To identify previously added border I use name property of CALayer. And compare that layer before remove from sublayers.
I have tried the same code before using name property, but It creates random crash. But after using name property and comparing name before remove will solve the crash issue.

I hope this will help someone.