I'm trying to rotate a CALayer which is composed of UIBezierPath. The display is great.
CALayer* layer = [CALayer layer];
CAShapeLayer *shapeView = [[CAShapeLayer alloc] init];
UIBezierPath *arc = [UIBezierPath bezierPath];
[arc moveToPoint:CGPointMake(center.x + obj1.startx * cos(obj1.angle), center.y + obj1.starty * cos(obj1.angle))];
[shapeView setPath:arc.CGPath];
[layer addSublayer:shapeView];
// Rotation
layer.transform = CATransform3DMakeRotation(angle, 0, 0, 1);
But the CATransform3DmakeRotation rotate the CAShape around the point (0,0) I guess.
I tried to set the anchorPoint to the center of the view but it's not working better.
It seems that the CAlayer has no content because its height and width are equal to zero.
What did I do wrong ?
Thanks
Related
I'm trying to rotate a CAShapeLayer in place
UIBezierPath *aPath = [UIBezierPath bezierPath];
CGFloat originx = (97.5+250);
CGFloat originy = (205+250);
[aPath moveToPoint:CGPointMake(originx,originy)];
[aPath addArcWithCenter:CGPointMake(originx+15, originy-30) radius:15 startAngle:DEGREES_TO_RADIANS(180) endAngle:DEGREES_TO_RADIANS(360) clockwise:YES];
[aPath addLineToPoint:CGPointMake(originx+30,originy)];
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.anchorPoint = CGPointMake(originx, originy);
shapeLayer.path = [aPath CGPath];
shapeLayer.strokeColor = [[UIColor blueColor] CGColor];
shapeLayer.lineWidth = 3.0;
shapeLayer.fillColor = [[UIColor blueColor] CGColor];
[aPath closePath];
shapeLayer.transform = CATransform3DMakeRotation(310 * M_PI/180, 0.0, 0.0, 1.0);
[self.view.layer addSublayer:shapeLayer];
I want to rotate the shape around an axis within the shape itself (the code above makes my little shape rotate around an axis several hundred pixels from the actual centre.
I felt this should be controlled with an anchorpoint like this one:
shapeLayer.anchorPoint = CGPointMake(originx, originy);
but it seems to do nothing within the code.
Any ideas?
The anchorPoint is relative to the bounds of the layer. You can't use the anchor point to place your layer. Instead you can place your shape relative to the zero point, rotate it, and the move it to the desired point. Rotation and translation are done by the transform.
How can i create UIView with four corner.
0 = "NSPoint: {79.583483072916664, 54.148963562011716}"; // top left
1 = "NSPoint: {274.96375, 30.877176879882814}"; // top right
2 = "NSPoint: {306.15565104166666, 357.91370518493653}"; // bottom right
3 = "NSPoint: {77.101464843749994, 363.47374218750002}"; // bottom left
I have no idea where to start.
As your view is not a regular rectangle you need to first draw a path i.e. BezierPath and get a shape and imposing the shape on to the View. This view myView would behave like any other normal view
UIView *myView = [[UIView alloc]initWithFrame:self.view.frame];
UIBezierPath *linePath = [UIBezierPath bezierPath];
[linePath moveToPoint:CGPointMake(points[0].x, points[0].y)];
[linePath addLineToPoint:CGPointMake(points[1].x, points[1].y)];
[linePath addLineToPoint:CGPointMake(points[2].x, points[2].y)];
[linePath addLineToPoint:CGPointMake(points[3].x, points[3].y)];
[linePath closePath];
CAShapeLayer *shape = [[CAShapeLayer alloc]init];
[shape setPath:linePath.CGPath];
myView.layer.mask=shape;
myView.backgroundColor = [UIColor redColor];
[self.view addSubview:myView];
The output ScreenShot is as given below:
Your 4 corner points do not make a rectangle - a UIView cannot be an arbitrary quadrilateral.
For drawing irregular shapes you should look at Apple's docs for using bezier paths: https://developer.apple.com/library/content/documentation/2DDrawing/Conceptual/DrawingPrintingiOS/BezierPaths/BezierPaths.html
So something like this:
- (void)drawRect:(CGRect)rect {
[[UIColor redColor] setStroke];
[[UIColor yellowColor] setFill];
UIBezierPath *linePath = [UIBezierPath bezierPath];
[linePath moveToPoint:CGPointMake(points[0].x, points[0].y)];
[linePath addLineToPoint:CGPointMake(points[1].x, points[1].y)];
[linePath addLineToPoint:CGPointMake(points[2].x, points[2].y)];
[linePath addLineToPoint:CGPointMake(points[3].x, points[3].y)];
[linePath setLineWidth:LINE_WIDTH];
[linePath closePath];
}
What you want is polygon shape and not rectangle. You can not assign polygon shape to view. but if you want to display only part of view fall between these points, you can draw UIBezierPath path with these points on view and then apply blend to clip outer part. here is sample code.
self.backgroundColor = [UIColor redColor];
UIBezierPath *aPath = [UIBezierPath bezierPath];
[aPath moveToPoint:CGPointMake( a.x, a.y)];
[aPath addLineToPoint:CGPointMake(b.x, b.y)];
[aPath addLineToPoint:CGPointMake(c.x, c.y)];
[aPath addLineToPoint:CGPointMake( d.x, d.y)];
[aPath closePath];
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = aPath.CGPath;
[self.layer setMask:shapeLayer];
You can use CALayer for corners, Below lines create a view with corners rounded by 8.
UIView *myView = [[UIView alloc] init];
myView.layer.masksToBounds = YES;
myView.layer.cornerRadius = 8.0;
Or you can create view with certain frame like
UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(x, y, w, h)];
I just updated to Xcode 8 and I had problem with Blur (UIVisualEffectView) on iOS 10, but I solve it. But after I fixed the blur layer mask second problem is appears, when I getting the reference of maskView from UIVisualEffectView and apply the new UIBezierPath nothing happens.
Code example:
-(void)prepareEffectView{
//Frame
CGRect frame = self.view.bounds;
UIView *maskView = [[UIView alloc] initWithFrame:frame];
maskView.backgroundColor = [UIColor blackColor];
maskView.layer.mask = ({ // This mask draws a rectangle and crops a circle inside it.
UIBezierPath *maskLayerPath = [UIBezierPath bezierPath];
[maskLayerPath appendPath:[UIBezierPath bezierPathWithRect:frame]];
[maskLayerPath appendPath:[UIBezierPath bezierPathWithRect:CGRectMake(self.btnScan.center.x, self.btnScan.center.y, 0, 0)]];
[maskLayer setPath:maskLayerPath.CGPath];
[maskLayerPath setUsesEvenOddFillRule:YES];
CAShapeLayer *mask = [CAShapeLayer layer];
mask.path = maskLayerPath.CGPath;
mask.fillRule = kCAFillRuleEvenOdd;
mask;
});
self.visualEffectView.maskView = maskView;
}
-(void)openAperture{
//Blur layer
CGRect frame = self.view.bounds;
CAShapeLayer *maskLayer = (CAShapeLayer *)self.visualEffectView.maskView.layer.mask;
//New path value
UIBezierPath *maskLayerPath = [UIBezierPath bezierPath];
[maskLayerPath appendPath:[UIBezierPath bezierPathWithRect:frame]];
[maskLayerPath appendPath:[UIBezierPath bezierPathWithRoundedRect:UIEdgeInsetsInsetRect(frame, UIEdgeInsetsMake(58, 15, 66, 15)) cornerRadius:1]];
[maskLayer setPath:maskLayerPath.CGPath];
//Animation
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"path"];
animation.delegate = self;
animation.duration = 0.44;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
animation.fromValue = (id)maskLayer.path;
animation.toValue = (id)maskLayerPath.CGPath;
[maskLayer addAnimation:animation forKey:#"animatePath"];
}
Apple Note About VisualEffectView issue on iOS 10
Transitions are tough in this realm, as maskView is the only way to
ensure that the effect works, but maskView also isn't animatable.
https://forums.developer.apple.com/message/184810#184810
The only the way to use "CAShapeLayer" as a mask is to apply your shape to UIView.layer.mask and then put it to UIVisualEffectView.maskView.
The maskView of UIVisualEffectView isn't animatable.
I have the same problem.
I tried to do next: (Swift code)
visualEffectView.layer.mask = maskView.layer.mask
instead of visualEffectView.mask = maskView
If so, path animation works fine, but then blur effect is gone.
If you find a solution, please update the post.
I have a CALayer as a sublayer to a CAGradientLayer and I find that shadows do not render. I'm wondering if someone has done this successfully?
Heres my implementation:
CAGradientLayer *root;
// set up root with gradient
// gradient displays well
[self.layer addSublayer:root];
CALayer *menuBox = [CALayer layer];
menuBox.backgroundColor = [UIColor whiteColor].CGColor;
menuBox.frame = CGRectInset(root.frame, 20, 20);
menuBox.cornerRadius = 15.0;
menuBox.masksToBounds = YES;
menuBox.shadowColor = [UIColor greenColor].CGColor;
menuBox.shadowOffset = CGSizeMake(4.0,6.0);
menuBox.shadowOpacity = 1.0;
menuBox.shadowRadius = 4.0;
//add sublayers to root in correct order, bottom first
[root addSublayer:menuBox];
I display a rounded white rectangle over a gradient background. I want the white rectangle to have a shadow, but none appears.
Any tips?
Hi! I want to draw a rounded corner of my UIView. Only one, others cannot be changed.
Starting in iOS 3.2, you can use the functionality of UIBezierPaths to create an out-of-the-box rounded rect (where only corners you specify are rounded). You can then use this as the path of a CAShapeLayer, and use this as a mask for your view's layer:
// Create the path (with only the top-left corner rounded)
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:imageView.bounds
byRoundingCorners:UIRectCornerTopLeft
cornerRadii:CGSizeMake(10.0, 10.0)];
// Create the shape layer and set its path
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = imageView.bounds;
maskLayer.path = maskPath.CGPath;
// Set the newly created shape layer as the mask for the image view's layer
imageView.layer.mask = maskLayer;
And that's it - no messing around manually defining shapes in Core Graphics, no creating masking images in Photoshop. The layer doesn't even need invalidating. Applying the rounded corner or changing to a new corner is as simple as defining a new UIBezierPath and using its CGPath as the mask layer's path. The corners parameter of the bezierPathWithRoundedRect:byRoundingCorners:cornerRadii: method is a bitmask, and so multiple corners can be rounded by ORing them together.
NOTE - Layer masks will not render when used in combination with the CALayer renderInContext method. If you need to use this try rounding corners with the following: Just two rounded corners?.
I made a method of StuDev's answer:
+ (CAShapeLayer *) roundedCornerOnImage: (UIImageView *)imageView onCorner: (UIRectCorner)rectCorner
{
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:imageView.bounds
byRoundingCorners:rectCorner
cornerRadii:CGSizeMake(10.0, 10.0)];
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = imageView.bounds;
maskLayer.path = maskPath.CGPath;
return maskLayer;
}
Example of usage on a imageview in a UITableViewCell:
if (indexPath.row == 0)
cell.imageView.layer.mask = [Helper roundedCornerOnImage:cell.imageView onCorner:UIRectCornerTopLeft];
else if (indexPath.row == self.arrayPeople.count - 1)
cell.imageView.layer.mask = [Helper roundedCornerOnImage:cell.imageView onCorner:UIRectCornerBottomLeft];
Thanks to StuDev for a great solution!
+ (CAShapeLayer *) roundedCornerOnImage: (UIImageView *)imageView onCorner: (UIRectCorner)rectCorner
{
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:imageView.bounds
byRoundingCorners:rectCorner
cornerRadii:CGSizeMake(10.0, 10.0)];
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = imageView.bounds;
maskLayer.path = maskPath.CGPath;
imageView.layer.mask=maskLayer
return maskLayer;
}
if (indexPath.row == 0)
[Helper roundedCornerOnImage:cell.imageView onCorner:UIRectCornerTopLeft];
else if (indexPath.row == self.arrayPeople.count - 1)
[Helper roundedCornerOnImage:cell.imageView onCorner:UIRectCornerBottomLeft];
An updated answer to above , you dont need to return and manage that. It can be done in that function.
I have made a function for make the Custom corner radius after doing some small R&D as following:
+(void)setConerRadiusForTopLeft:(BOOL)isForTopLeft ForTopRight:(BOOL)isForTopRight ForBottomLeft:(BOOL)isForBottomLeft ForBottomRight:(BOOL)isForBottomRight withCornerRadius:(float)cornerRadius forView:(UIView *)view
{
UIRectCorner corners = (isForTopLeft ? UIRectCornerTopLeft : 0) |
(isForTopRight ? UIRectCornerTopRight : 0) |
(isForBottomLeft ? UIRectCornerBottomLeft : 0) |
(isForBottomRight ? UIRectCornerBottomRight : 0);
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds
byRoundingCorners:corners
cornerRadii:CGSizeMake(cornerRadius, cornerRadius)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = view.bounds;
maskLayer.path = maskPath.CGPath;
view.layer.mask = maskLayer;
}