Giving UIView rounded corners

问题:

My login view has a subview which has a UIActivityView and a UILabel saying \"Signing In…\". This subview has corners which aren\'t rounded. How can I make them round?

Is there any way to do it inside my xib?

回答1:

Try this

#import <QuartzCore/QuartzCore.h> // not necessary for 10 years now  :)

...

view.layer.cornerRadius = 5;
view.layer.masksToBounds = true;

Note: If you are trying to apply rounded corners to a UIViewController\'s view, it should not be applied in the view controller\'s constructor, but rather in -viewDidLoad, after view is actually instantiated.

回答2:

You can also use the User Defined Runtime Attributes feature of interface builder to set the key path layer.cornerRadius to a value. Make sure you include the QuartzCore library though.

This trick also works for setting layer.borderWidth however it will not work for layer.borderColor as this expects a CGColor not a UIColor.

You will not be able to see the effects in the storyboard because these parameters are evaluated at runtime.

回答3:

Now you can use a swift category in UIView (code bellow the picture) in with @IBInspectable to show the result at the storyboard (If you are using the category, use only cornerRadius and not layer.cornerRadius as a key path.

extension UIView {
    @IBInspectable var cornerRadius: CGFloat {
        get {
            return layer.cornerRadius
        }
        set {
            layer.cornerRadius = newValue
            layer.masksToBounds = newValue > 0
        }
    }
}

回答4:

A different approach than the one Ed Marty did:

#import <QuartzCore/QuartzCore.h>

[v.layer setCornerRadius:25.0f];
[v.layer setMasksToBounds:YES];

You need the setMasksToBounds for it to load all the objects from IB... i got a problem where my view got rounded, but did not have the objects from IB :/

this fixed it =D hope it helps!

回答5:

Swift

Short answer:

myView.layer.cornerRadius = 8
myView.layer.masksToBounds = true  // optional

Supplemental Answer

If you have come to this answer, you have probably already seen enough to solve your problem. I\'m adding this answer to give a bit more visual explanation for why things do what they do.

If you start with a regular UIView it has square corners.

let blueView = UIView()
blueView.frame = CGRect(x: 100, y: 100, width: 100, height: 50)
blueView.backgroundColor = UIColor.blueColor()
view.addSubview(blueView)

You can give it round corners by changing the cornerRadius property of the view\'s layer.

blueView.layer.cornerRadius = 8

Larger radius values give more rounded corners

blueView.layer.cornerRadius = 25

and smaller values give less rounded corners.

blueView.layer.cornerRadius = 3

This might be enough to solve your problem right there. However, sometimes a view can have a subview or a sublayer that goes outside of the view\'s bounds. For example, if I were to add a subview like this

let mySubView = UIView()
mySubView.frame = CGRect(x: 20, y: 20, width: 100, height: 100)
mySubView.backgroundColor = UIColor.redColor()
blueView.addSubview(mySubView)

or if I were to add a sublayer like this

let mySubLayer = CALayer()
mySubLayer.frame = CGRect(x: 20, y: 20, width: 100, height: 100)
mySubLayer.backgroundColor = UIColor.redColor().CGColor
blueView.layer.addSublayer(mySubLayer)

Then I would end up with

Now, if I don\'t want things hanging outside of the bounds, I can do this

blueView.clipsToBounds = true

or this

blueView.layer.masksToBounds = true

which gives this result:

Both clipsToBounds and masksToBounds are equivalent. It is just that the first is used with UIView and the second is used with CALayer.

See also

• How to add borders and shadow
• Bezier paths
• Transformations

回答6:

As described in this blog post, here is a method to round the corners of a UIView:

+(void)roundView:(UIView *)view onCorner:(UIRectCorner)rectCorner radius:(float)radius
{
    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds
                                                   byRoundingCorners:rectCorner
                                                         cornerRadii:CGSizeMake(radius, radius)];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = view.bounds;
    maskLayer.path = maskPath.CGPath;
    [view.layer setMask:maskLayer];
    [maskLayer release];
}

The cool part about it is that you can select which corners you want rounded up.

回答7:

You need to first import header file <QuartzCore/QuartzCore.h>

 #import QuartzCore/QuartzCore.h>

[yourView.layer setCornerRadius:8.0f];
yourView.layer.borderColor = [UIColor redColor].CGColor;
yourView.layer.borderWidth = 2.0f;
[yourView.layer setMasksToBounds:YES];

Don\'t miss to use -setMasksToBounds , otherwise the effect may not be shown.

回答8:

You can use following custom UIView class which can also change border color and width. As this is IBDesignalbe You can change the attributes in interface builder as well.

import UIKit

@IBDesignable public class RoundedView: UIView {

    @IBInspectable var borderColor: UIColor = UIColor.white {
        didSet {
            layer.borderColor = borderColor.cgColor
        }
    }

    @IBInspectable var borderWidth: CGFloat = 2.0 {
        didSet {
            layer.borderWidth = borderWidth
        }
    }

    @IBInspectable var cornerRadius: CGFloat = 0.0 {
        didSet {
            layer.cornerRadius = cornerRadius
        }
    }

}

回答9:

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(20, 50, 200, 200)];

view.layer.backgroundColor = [UIColor whiteColor].CGColor;
view.layer.cornerRadius = 20.0;
view.layer.frame = CGRectInset(v.layer.frame, 20, 20);

view.layer.shadowOffset = CGSizeMake(1, 0);
view.layer.shadowColor = [[UIColor blackColor] CGColor];
view.layer.shadowRadius = 5;
view.layer.shadowOpacity = .25;

[self.view addSubview:view];
[view release];

回答10:

view.layer.cornerRadius = 25
view.layer.masksToBounds = true

回答11:

Please import Quartzcore framework then you have to set setMaskToBounds to TRUE this the very important line.

Then: [[yourView layer] setCornerRadius:5.0f];

回答12:

UIView* viewWithRoundedCornersSize(float cornerRadius,UIView * original)
{
    // Create a white border with defined width
    original.layer.borderColor = [UIColor yellowColor].CGColor;
    original.layer.borderWidth = 1.5;

    // Set image corner radius
    original.layer.cornerRadius =cornerRadius;

    // To enable corners to be \"clipped\"
    [original setClipsToBounds:YES];
    return original;
}

回答13:

Swift 4 - Using IBDesignable

   @IBDesignable
    class DesignableView: UIView {
    }

    extension UIView
    {

        @IBInspectable
        var cornerRadius: CGFloat {
            get {
                return layer.cornerRadius
            }
            set {
            layer.cornerRadius = newValue
        }
    }
}

回答14:

Do this programatically in obj c

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(20, 50,    200, 200)];

view.layer.backgroundColor = [UIColor whiteColor].CGColor;
view.layer.cornerRadius = 20.0;
view.layer.frame = CGRectInset(v.layer.frame, 20, 20);

[view.layer.shadowOffset = CGSizeMake(1, 0);
view.layer.shadowColor = [[UIColor blackColor] CGColor];
view.layer.shadowRadius = 5;
view.layer.shadowOpacity = .25;][1]

[self.view addSubview:view];

We Can Also do this from stoaryboard.

 layer.cornerRadius  Number  5

回答15:

if round corner not working in viewDidload() it\'s better to write code in viewDidLayoutSubview()

-(void)viewDidLayoutSubviews
{
    viewTextfield.layer.cornerRadius = 10.0 ;                                               
    viewTextfield.layer.borderWidth = 1.0f;
    viewTextfield.layer.masksToBounds =  YES;
    viewTextfield.layer.shadowRadius = 5;
    viewTextfield.layer.shadowOpacity = 0.3;
    viewTextfield.clipsToBounds = NO;
    viewTextfield.layer.shadowOffset = CGSizeMake(0.0f, 0.0f);
}

Hope this helps!

回答16:

You can also use an image:

UIImage *maskingImage = [UIImage imageNamed:@\"bannerBarBottomMask.png\"];
CALayer *maskingLayer = [CALayer layer];
maskingLayer.frame = CGRectMake(-(self.yourView.frame.size.width - self.yourView.frame.size.width) / 2
                                , 0
                                , maskingImage.size.width
                                , maskingImage.size.height);
[maskingLayer setContents:(id)[maskingImage CGImage]];
[self.yourView.layer setMask:maskingLayer];

回答17:

set cornerRadious Property for round View

set masksToBounds Boolean Value for image will not still be drawn outside the corner radius boundary

view.layer.cornerRadius = 5;

view.layer.masksToBounds = YES;

回答18:

Using UIView Extension:

extension UIView {    

func addRoundedCornerToView(targetView : UIView?)
{
    //UIView Corner Radius
    targetView!.layer.cornerRadius = 5.0;
    targetView!.layer.masksToBounds = true

    //UIView Set up boarder
    targetView!.layer.borderColor = UIColor.yellowColor().CGColor;
    targetView!.layer.borderWidth = 3.0;

    //UIView Drop shadow
    targetView!.layer.shadowColor = UIColor.darkGrayColor().CGColor;
    targetView!.layer.shadowOffset = CGSizeMake(2.0, 2.0)
    targetView!.layer.shadowOpacity = 1.0
}
}

Usage:

override func viewWillAppear(animated: Bool) {

sampleView.addRoundedCornerToView(statusBarView)

}

回答19:

ON Xcode 6 Your try

     self.layer.layer.cornerRadius = 5.0f;

or

    self.layer.layer.cornerRadius = 5.0f;
    self.layer.clipsToBounds = YES;