CAShapeLayer *circle = [CAShapeLayer layer];
circle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 2.0*radius, 2.0*radius) cornerRadius:radius].CGPath;
// Configure the apperence of the circle
circle.fillColor = [UIColor clearColor].CGColor;
circle.strokeColor = [UIColor whiteColor].CGColor;
circle.lineWidth = 1;
// Add to parent layer
[[background layer] addSublayer:circle];
I have drawn a circle and added it as a sublayer. What I don't understand is how to make the circle line dashed? I have added my circle code above.
You need to set the lineDashPattern property of circle. For example:
circle.lineDashPattern = #[#2, #3];
Related
I am currently using CAShapeLayer for one of my requirement. I was successful in implementing the fillcolor, strokecolor, etc... but I wanted to change the color of outer part of that CAShapeLayer. I tried doing it with backgroundcolor, & followed many answers from SO, but was unable to do it. Could anyone guide me with the solution. Screenshot attached
Edit 1: Code for creating the layer
// create layer mask for map
CAShapeLayer *maskLayer = [CAShapeLayer layer];
mapView.layer.mask = maskLayer;
// maskLayer.backgroundColor = [[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.7] CGColor];
self.maskLayer = maskLayer;
// create shape layer for circle we'll draw on top of map (the boundary of the circle)
CAShapeLayer *circleLayer = [CAShapeLayer layer];
circleLayer.lineWidth = 3.0;
circleLayer.fillColor = [[UIColor clearColor] CGColor];
circleLayer.strokeColor = [[UIColor blackColor] CGColor];
// circleLayer.borderColor = [[UIColor blackColor] CGColor];
// circleLayer.backgroundColor = [[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.7] CGColor];
[mapView.layer addSublayer:circleLayer];
self.circleLayer = circleLayer;
Edit 2: Xcode's Viewer's Debugger
In the above image I can see that I have set the background color to self.view. But I want it to be over my map view & the the color should be semi transparent so that map data outside circle should also be visible.
Have you tried using XCode views's debugger to know where this white background belongs in your view hierarchy ?
You're using your view's maskLayer as a circle. So my guess is that this white background must be OUTSIDE your view - everything out your mask gets clipped - so you should probably try to change your viewController's view backgroundColor (or any other view that is just above your custom rounded view)
[self.view.layer setBackgroundColor:[UIColor grayColor].CGColor];
UIBezierPath *circle = [UIBezierPath bezierPathWithArcCenter:self.view.center
radius:45.0
startAngle:0
endAngle:2.0*M_PI
clockwise:YES];
CAShapeLayer *circleLayer = [CAShapeLayer layer];
circleLayer.bounds = CGRectMake(0, 0, 2.0*(45.0), 2.0*(45.0));
circleLayer.path = circle.CGPath;
circleLayer.strokeColor = [UIColor orangeColor].CGColor;
circleLayer.fillColor = [UIColor whiteColor].CGColor;
circleLayer.lineWidth = 3.0; // your line width
[self.view.layer addSublayer:circleLayer];
See if it helps you.
So I'm trying to cut a circle out of an existing layer; and here's my code:
CGRect bounds = _containerLayer.bounds;
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = bounds;
maskLayer.fillColor = [UIColor blackColor].CGColor;
CGFloat smallCircleRadius = (frame.size.width - barWidth)/2;
CGRect smallCircleRect = CGRectMake(CGRectGetMidX(bounds) - smallCircleRadius, CGRectGetMidY(bounds) - smallCircleRadius, 2 * smallCircleRadius, 2 * smallCircleRadius);
UIBezierPath *circlePath = [UIBezierPath bezierPathWithOvalInRect:smallCircleRect];
[circlePath appendPath:[UIBezierPath bezierPathWithRect:bounds]];
maskLayer.path = circlePath.CGPath;
maskLayer.fillRule = kCAFillRuleEvenOdd;
_containerLayer.mask = maskLayer;
This code does work, as I now see a black rectangle with a hollow circle in the middle. But the problem is that when I tried to set maskLayer.fillColor = [UIColor clearColor].CGColor;, The whole thing including _containerLayer just disappears - I want to make the fillColor transparent so I can see what's originally in the _containerLayer (which wasn't cut out). What should I do to achieve this? Thanks!
I am trying to create a circle which is filled depending upon a certain percentage. Here is pic of the effect I am going for:
I have a UIView and to this I add a CAShapeLayer which draws the circle. I am then creating another UIShapeLayer as a square to match the UIView containing the circle. Then setting the height of this depending on the figure. So if the square is 100px high and the value is 10% then I set the square to 10px so that it fills 10% of circle.
The image below shows 50% of the circle being filled. As you can see it covers the UIView as well as the circle. However when I try to set the CAShapeLayer to mask to bounds ( circle.maskToBounds) the circle complete disappears along with the square that I am adding as it's subview.
Here is my code:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];
[self drawCircleInView:view];
[self.view addSubview:view];
}
- (void)drawCircleInView:(UIView *)v
{
// Set up the shape of the circle
int radius = v.frame.size.height / 2;
CAShapeLayer *circle = [CAShapeLayer layer];
// Make a circular shape
circle.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 2*radius, 2*radius)
cornerRadius:radius].CGPath;
// Center the shape in self.view
circle.position = CGPointMake(CGRectGetMidX(v.bounds)-radius,
CGRectGetMidY(v.bounds)-radius);
// Configure the apperence of the circle
circle.fillColor = [UIColor blueColor].CGColor;
circle.strokeColor = [UIColor clearColor].CGColor;
circle.lineWidth = 5;
circle.masksToBounds = YES; // HERE IS THE LINE OF CODE THAT MAKES THE CIRCLE DISAPPEAR
CAShapeLayer *sublayer = [CAShapeLayer layer];
sublayer.backgroundColor = [UIColor orangeColor].CGColor;
sublayer.opacity = .5f;
sublayer.frame = CGRectMake(0, 100, 200, 100);
[circle addSublayer:sublayer];
// Add to parent layer
[v.layer addSublayer:circle];
}
I am wondering why setting circle.masksToBounds = YES is making the circle and the sublayer disappear completely. My understanding is that by setting this it should only show the sublayer over the circle.
Many thanks in advance.
Try this:
- (void)drawCircleInView:(UIView *)v {
// Set up the shape of the circle
CGSize size = v.bounds.size;
CALayer *layer = [CALayer layer];
layer.frame = v.bounds;
layer.backgroundColor = [UIColor blueColor].CGColor;
CALayer *sublayer = [CALayer layer];
sublayer.frame = CGRectMake(0, size.height/2, size.width, size.height/2);
sublayer.backgroundColor = [UIColor orangeColor].CGColor;
sublayer.opacity = .5f;
CAShapeLayer *mask = [CAShapeLayer layer];
mask.frame = v.bounds;
mask.path = [UIBezierPath bezierPathWithOvalInRect:v.bounds].CGPath;
mask.fillColor = [UIColor blackColor].CGColor;
mask.strokeColor = [UIColor clearColor].CGColor;
[layer addSublayer:sublayer];
[layer setMask:mask];
// Add to parent layer
[v.layer addSublayer:layer];
}
maskToBounds is "to bounds" you are not setting bounds nor frame.
It's not necessary, but you'd better to set frame of CAShapeLayer, to prevent unnecessary confusion.
bounds is rectangle, not CAShapeLayer's shape. Use mask layer to mask by shape instead.
circle and sublayer is not need to be CAShapeLayer because it will be masked by shaped mask layer.
To achieve this use a square image with its center circle as transparent. like this image
How to use this image for this effect -
Add a square layer (with lighter color/ or non fill color) first. above that add a layer with the fill color with sane rect. and above all place this image. and change the frame of middle layer that has the fill color to achieve desired effect
I'm working on CAShapeLayer by creating a layer using CAShapeLayer like following:
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.frame = CGRectMake(150, 50, 200, 200);
shapeLayer.fillColor = [UIColor whiteColor].CGColor;
shapeLayer.strokeColor = [UIColor orangeColor].CGColor;
[self.view.layer addSublayer:shapeLayer];
However, when I execute the codes and I cant see my shapeLayer in the simulator/device.
What I am missing here.
PS : If I am using CALayer *shapeLayer = [CALayer layer]; it works.Confused
add a path to it, like
shapeLayer.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 2.0*radius, 2.0*radius)
cornerRadius:radius].CGPath;
A shaped layer needs a shape…
I put this in my View Controller and it works fine:
- (void)viewDidLoad
{
[super viewDidLoad];
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.frame = CGRectMake(150, 50, 200, 200);
shapeLayer.fillColor = [UIColor whiteColor].CGColor;
shapeLayer.strokeColor = [UIColor orangeColor].CGColor;
NSUInteger radius = 90;
shapeLayer.path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, 2.0*radius, 2.0*radius)
cornerRadius:radius].CGPath;
[self.view.layer addSublayer:shapeLayer];
}
If you change the path like
shapeLayer.path = [UIBezierPath bezierPathWithRect:shapeLayer.bounds].CGPath;
it'll result in
I am trying to round the bottom two corners of a UIView, and have the layer’s border show up rounded as well. I am currently doing:
UIRectCorners corners = UIRectCornerBottomLeft | UIRectCornerBottomRight;
CGSize radii = CGSizeMake(kThisViewCornerRadius, kThisViewCornerRadius);
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:myView.bounds
byRoundingCorners:corners
cornerRadii:radii];
CAShapeLayer *maskLayer = [CAShapeLayer layer];
[maskLayer setPath:path.CGPath];
myView.layer.mask = maskLayer;
This works fine for normal views. However, myView’s layer has its borderColor and borderWidth set, and as you can see from the screenshot, the layer’s border is not getting rounded:
I also tried subclassing UIView and returning [CAShapeLayer layer] from +[Class layerClass], and setting up the view’s layer as a shape layer, but the border ended up beneath the view’s subviews.
Is it possible to round some of a view’s corners, round the view’s layer’s border, and clip the subviews underneath the layer’s border?
Note that this is not about how to round some corners and not others, but rather how to get the stroke to behave correctly.
I figured out a new way of thinking about it, thanks to David Rönnqvist’s comment.
I was trying to do the corner rounding and the stroke all in one layer. Instead, I broke it up into two layers: one to mask the view’s layer to round the corners, and the other in a view to add the stroke.
UIView *containerView = [[UIView alloc] initWithFrame:someFrame];
UIRectCorners corners = UIRectCornerBottomLeft | UIRectCornerBottomRight;
CGSize radii = CGSizeMake(kThisViewCornerRadius, kThisViewCornerRadius);
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:myView.bounds
byRoundingCorners:corners
cornerRadii:radii];
// Mask the container view’s layer to round the corners.
CAShapeLayer *cornerMaskLayer = [CAShapeLayer layer];
[cornerMaskLayer setPath:path.CGPath];
containerView.layer.mask = cornerMaskLayer;
// Make a transparent, stroked layer which will dispay the stroke.
CAShapeLayer *strokeLayer = [CAShapeLayer layer];
strokeLayer.path = path.CGPath;
strokeLayer.fillColor = [UIColor clearColor].CGColor;
strokeLayer.strokeColor = [UIColor redColor].CGColor;
strokeLayer.lineWidth = 2; // the stroke splits the width evenly inside and outside,
// but the outside part will be clipped by the containerView’s mask.
// Transparent view that will contain the stroke layer
UIView *strokeView = [[UIView alloc] initWithFrame:containerView.bounds];
strokeView.userInteractionEnabled = NO; // in case your container view contains controls
[strokeView.layer addSublayer:strokeLayer];
// configure and add any subviews to the container view
// stroke view goes in last, above all the subviews
[containerView addSubview:strokeView];
Zev Eisenberg's answer is the right one.
Although I prefer:
[self.layer addSublayer:strokeLayer];
instead of creating and adding a subview:
CGSize radii = CGSizeMake(radius, radius);
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:self.bounds
byRoundingCorners:corners
cornerRadii:radii];
// Mask the container view’s layer to round the corners.
CAShapeLayer *cornerMaskLayer = [CAShapeLayer layer];
[cornerMaskLayer setPath:path.CGPath];
self.layer.mask = cornerMaskLayer;
// Make a transparent, stroked layer which will dispay the stroke.
CAShapeLayer *strokeLayer = [CAShapeLayer layer];
strokeLayer.path = path.CGPath;
strokeLayer.fillColor = [UIColor clearColor].CGColor;
strokeLayer.strokeColor = color.CGColor;
strokeLayer.lineWidth = 2; // the stroke splits the width evenly inside and outside,
// but the outside part will be clipped by the containerView’s mask.
[self.layer addSublayer:strokeLayer];
Here is the small code. Alloc init a view and send to this method to get corners rounded. You can optionally round any of the corners u want. Also give shadow stroke color.
-(void) setMaskTo:(UIView*)view byRoundingCorners:(UIRectCorner)corners withColor: (UIColor*) color
{
UIBezierPath* rounded = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(9.0, 9.0)];
CAShapeLayer* shape = [[[CAShapeLayer alloc] init] autorelease];
[shape setPath:rounded.CGPath];
shape.strokeColor = [[UIColor grayColor] CGColor];
view.backgroundColor=color;
view.layer.mask = shape;
}
Call the method like this.
[self setMaskTo:ABCView byRoundingCorners:UIRectCornerAllCorners withColor:[UIColor greenColor]];