I am not able to display rounded caps on my Arc created using UIBezierPath. It's still perfectly squared regardless I set kCGLineCapRound or not.
This topic should be same as this one, however solution is not working.
Here is the example code I have in viewWillAppear (for test purposes only):
int radius = 100;
CAShapeLayer *arc = [CAShapeLayer layer];
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(100, 50) radius:radius startAngle:M_PI endAngle:M_PI/150 clockwise:YES];
path.lineCapStyle = kCGLineCapRound;
arc.path = path.CGPath;
arc.position = CGPointMake(CGRectGetMidX(self.view.frame)-radius, CGRectGetMidY(self.view.frame)-radius);
arc.fillColor = [UIColor clearColor].CGColor;
arc.strokeColor = [UIColor purpleColor].CGColor;
arc.lineWidth = 10.0f;
arc.cornerRadius = 3.0f;
Here is how it looks:
I am helpless so I would appreciate any help. Thanks guys.
Use the lineCap property of the CAShapeLayer rather than the lineCapStyle of the path.
arc.lineCap = kCALineCapRound;
If you are calling the path's stroke method (e.g. if you're doing this in drawRect or manually drawing in a UIGraphicsContext) then set attributes like the cap or join styles in the UIBezierPath. But when using CAShapeLayer, the attributes are set on the shape layer, not the path.
Related
My problem is following: I'm trying to cut out a segment out of custom UIView and apply a shadow effect to this view.
In a custom UIView class, I did this:
Created two layers - shadow and mask. Added a shadow layer as a sublayer for this custom view. Then I created a new view, set its mask as the mask layer and added it as a subview to the custom view.
self.backgroundColor = [UIColor clearColor];
CGFloat radius = 40;
float startAngle = -M_PI;
float endAngle = 0;
UIBezierPath *path = [UIBezierPath bezierPathWithRect:self.bounds];
[path moveToPoint:CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMaxY(self.bounds)+radius/1.8)];
[path addArcWithCenter:CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMaxY(self.bounds)+radius/1.8) radius:radius startAngle:startAngle endAngle:endAngle clockwise:YES];
CAShapeLayer *shadowLayer = [[CAShapeLayer alloc] init];
shadowLayer.frame = self.bounds;
shadowLayer.path = path.CGPath;
shadowLayer.shadowColor = [UIColor grayColor].CGColor;
shadowLayer.shadowOpacity = 0.5;
shadowLayer.shadowRadius = 2;
shadowLayer.masksToBounds = NO;
shadowLayer.shadowOffset = CGSizeMake(2.0, 2.0);
shadowLayer.fillRule = kCAFillRuleEvenOdd;
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = self.bounds;
maskLayer.masksToBounds = NO;
maskLayer.path = path.CGPath;
maskLayer.fillRule = kCAFillRuleEvenOdd;
maskLayer.fillColor = [UIColor whiteColor].CGColor;
[self.layer addSublayer:shadowLayer];
UIView *view = [[UIView alloc] initWithFrame:self.bounds];
view.backgroundColor = [UIColor whiteColor];
view.layer.mask = maskLayer;
[self addSubview:view];
That is what I want to achieve -
and this is what I actually get
If I set clipToBounds = YES, it will cut off the desired shadow effect.
There would be absolutely no problem, if I wanted to cut of a semicircle. Because in this case the semicircle path fully sits inside of view bounds.
But I do need to achieve a result shown in the first image.
I was thinking about building the path line by line, but the problem occurs when it comes to this arc, and the result will probably not be so accurate.
Does anyone have ideas how it could be done?
Thank you!
EDIT:
If the issue is that the path is wrong, do no composite the path in code using a circle and guessing the coordinates. Instead you should export the coordinates actual artwork and use the artwork coordinates for the curve. It looks like you have a sketch file so the easiest way to do this is to copy and paste into paint code which will give you the code for the curve, but in the event you don't have paint code (you should, its amazing for this kind of stuff) you can export the curve as SVG from sketch. If you open the resulting SVG in a text editor you will see its in human readable XML and you can extract the control points from your Bezier curve from there.
I am using a UIBezierPath to draw a curved line. The curve works however, I am unable to curve the edges of the line.
If you look at the top/bottom end of the curve, you can see that the edges are flattened out, thats not what I want. Is there a way to curve the edges?
I am using a simple UIBezierPath to draw an (almost) semi circle. This creates the curved line shape that I want:
CAShapeLayer *circle = [CAShapeLayer layer];
circle.path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(0, 0) radius:70 startAngle:1.0472 endAngle:5.23599 clockwise:NO].CGPath;
circle.fillColor = [UIColor clearColor].CGColor;
circle.strokeColor = [UIColor colorWithWhite:1.0 alpha:0.2].CGColor;
circle.lineWidth = 18.0;
circle.cornerRadius = 10.0;
circle.position = CGPointMake(100, 100);
circle.anchorPoint = CGPointMake(0.5, 0.5);
[mainView.layer addSublayer:circle];
Despite setting the cornerRadius property, the corners are not curved. What am I doing wrong?
Thanks for your time, Dan.
Include the following.
circle.lineCap = kCALineJoinRound;
For Swift 3.0 and above
circle.lineCapStyle = .Round;
Swift 4.0
circle.lineCap = kCALineCapRound
and if you want your lines intersections to also be rounded set
circle.lineJoin = kCALineCapRound
as well.
Referring to the accepted answer found here I'm trying to implement this and running into an issue with the path of the CAShapeLayerThe code I have is as follows:
-(void)drawGradientArc{
UIBezierPath *bezierPath = [UIBezierPath bezierPath];
CAShapeLayer *circleLayer = [CAShapeLayer new];
circleLayer.lineWidth = 25;
circleLayer.fillColor = [UIColor clearColor].CGColor;
circleLayer.strokeColor = [UIColor redColor].CGColor;
CGFloat radius = 150;
[bezierPath addArcWithCenter:self.view.center radius:radius startAngle:0 endAngle:M_PI clockwise:YES];
CAGradientLayer *gradientLayer = [CAGradientLayer layer];
gradientLayer.startPoint = CGPointMake(0,0);
gradientLayer.endPoint = CGPointMake(1,0);
NSMutableArray *colors = [NSMutableArray array];
for (int i = 0; i < 10; i++) {
[colors addObject:(id)[[UIColor colorWithHue:(0.1 * i) saturation:1 brightness:.8 alpha:1] CGColor]];
}
gradientLayer.colors = colors;
[gradientLayer setMask:circleLayer];
circleLayer.path = bezierPath.CGPath;
[self.view.layer addSublayer:circleLayer];
}
This will draw the half circle arc correctly but the path for the gradients is not being set correctly and I was unable to piece together how exactly to configure the code to get this to work using a gradient. There is a CGPathCreateCopyByStrokingPath that I think I may also need to call to set the path properly for the gradient but was not quite sure how. Any help on how to structure the code to get this working would be appreciated. I've also included an image of the gradient that I'm trying to reproduce. a CAShapeLayer and CAGradientLayerapproach would be ideal.
Problem 1: Your layers have no frames. Add this:
gradientLayer.frame = self.view.layer.bounds;
circleLayer.frame = gradientLayer.bounds;
Problem 2: You are adding the wrong layer to your view's layer. Where you have:
[self.view.layer addSublayer:circleLayer];
say this instead:
[self.view.layer addSublayer:gradientLayer];
Result:
I have used both UIBezierPath and CAShapeLayer before. But almost every time in conjunction with filling the object contained within the path with color inside. But I would like this time to fill the color outside of the object contained by the UIBezierPath.
I just wrote and ran the following simple code trying to get myself acquainted with the fillRule property:
CAShapeLayer *myLayer = (CAShapeLayer *) self.layer; //size: 320 X 480
UIBezierPath *testPath = [UIBezierPath bezierPathWithOvalInRect:(CGRect){{100, 100}, 100, 100}]; //a simple circle
myLayer.fillRule = kCAFillRuleNonZero; // have tried this as well: kCAFillRuleEvenOdd;
myLayer.path = testPath.CGPath;
myLayer.fillColor = [UIColor whiteColor].CGColor;
But the color is filled nonetheless inside. What I would like to find out is, how can I fill the color outside of the path? If I am using fillRule wrong here, I would like to know if there is other methods that can achieve this. Thanks in advance.
The main problem is that you can't really fill the outside of a shape, since there's no generic way to define what that means. What you need to do is first plot a path around the "outside" of your shape, and then add the circle as a subpath. How you do that depends on which fill rule you want to use. EvenOdd is the easiest:
CAShapeLayer *myLayer = (CAShapeLayer *) self.layer;
UIBezierPath *testPath = [UIBezierPath bezierPathWithRect:self.bounds];
[testPath appendPath:[UIBezierPath bezierPathWithOvalInRect:(CGRect){{100, 100}, 100, 100}]];
myLayer.fillRule = kCAFillRuleEvenOdd;
myLayer.path = testPath.CGPath;
myLayer.fillColor = [UIColor whiteColor].CGColor;
NonZero is a little bit harder because you have to force the path to be counter-clockwise which isn't an option for most of the UIBezierPath convenience methods:
CAShapeLayer *myLayer = (CAShapeLayer *) self.layer;
UIBezierPath *testPath = [UIBezierPath bezierPathWithRect:self.bounds];
UIBezierPath *counterClockwise = [UIBezierPath bezierPathWithArcCenter:CGPointMake(100, 100) radius:100 startAngle:0 endAngle:M_PI clockwise:NO];
[counterClockwise appendPath:[UIBezierPath bezierPathWithArcCenter:CGPointMake(100, 100) radius:100 startAngle:M_PI endAngle:0 clockwise:NO]];
[testPath appendPath:counterClockwise];
myLayer.fillRule = kCAFillRuleNonZero;
myLayer.path = testPath.CGPath;
myLayer.fillColor = [UIColor redColor].CGColor;
Depending on how you're constructing your actual path it may not make a difference either way.
If you haven't seen it already, the winding rules documentation has some nice diagrams that I find helpful.
I am trying to draw a view with few hollow circles in it. The view background color will be black with opacity 0.5 and hollow circles on places where I could see the view underneath it. This is working fine with below piece of code but has an issue when my hollow circles intersects, I want to cover both of them as hollow area but due to even odd rule this is not working out. Any suggestions?
Or any alternatives?
- (void)addShadowView {
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height) cornerRadius:0];
for (NSValue *point in self.hollowFrames) {
UIBezierPath *circlePath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(point.CGPointValue.x - self.hollowCircleRadius.floatValue, point.CGPointValue.y - self.hollowCircleRadius.floatValue, 2.0 * self.hollowCircleRadius.floatValue, 2.0 * self.hollowCircleRadius.floatValue) cornerRadius:self.hollowCircleRadius.floatValue];
[path appendPath:circlePath];
}
[path setUsesEvenOddFillRule:YES];
CAShapeLayer *fillLayer = [CAShapeLayer layer];
fillLayer.path = path.CGPath;
fillLayer.fillRule = kCAFillRuleEvenOdd;
fillLayer.fillColor = [UIColor blackColor].CGColor;
fillLayer.opacity = 0.5;
[self.layer addSublayer:fillLayer];
}
This is how it looks right now. I want the intersected area also to be hollow and not filled with the fillColor.
don't fill the circles, clip out the centers.