cashapelayer

问题 I'm trying to implement the next curious thing: I have a few dots and I'd like to link them with sine waves Next method returns the array of dots for making plot: - (NSArray *)plotPointsBetweenPoint:(CGPoint)pointA andPoint:(CGPoint)pointB { double H = fabs(pointB.y - pointA.y); double L = fabs(pointB.x - pointA.x); NSInteger granularity = 40; NSMutableArray *array = [NSMutableArray arrayWithCapacity:granularity + 1]; for (int i = 0; i <= granularity; ++i) { CGFloat x = M_PI*(float)i/

问题 I have this piece of code: let arcPath = UIBezierPath(ovalInRect: CGRectMake(0, 0, frame.width, frame.height)) circleLayer = CAShapeLayer() circleLayer.path = arcPath.CGPath circleLayer.fillColor = UIColor.clearColor().CGColor circleLayer.strokeColor = UIColor.blueColor().CGColor circleLayer.lineWidth = 5.0; circleLayer.strokeStart = 0 circleLayer.strokeEnd = 0.7 which results like this: As you can see, the arc starts on the right side of the circle. I would like to draw the arc starting from

问题 Given the following CAShapeLayer is it possible to add a drop shadow like the following image at the tip? I'm using a UIBezierPath to draw the bars. - (CAShapeLayer *)gaugeCircleLayer { if (_gaugeCircleLayer == nil) { _gaugeCircleLayer = [CAShapeLayer layer]; _gaugeCircleLayer.lineWidth = self.gaugeWidth; _gaugeCircleLayer.fillColor = [UIColor clearColor].CGColor; _gaugeCircleLayer.strokeColor = self.gaugeTintColor.CGColor; _gaugeCircleLayer.strokeStart = 0.0f; _gaugeCircleLayer.strokeEnd =

问题 I created a rectangle using following code and now I need to rounded the corners of this rectangle. but I can't find a property called layer.cornerRadius, can anyone help me ? class OvalLayer: CAShapeLayer { let animationDuration: CFTimeInterval = 0.3 override init() { super.init() fillColor = Colors.green.CGColor path = ovalPathSmall.CGPath } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } var ovalPathStart: UIBezierPath { let path =

问题 I'm trying to create a bezier path like the instagram triangle in the picture below, however I must be doing something wrong. The Bezier path does not show! - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. } -(void)viewDidLayoutSubviews{ [super viewDidLayoutSubviews]; [self drawTriangle]; } - (IBAction)closeButton:(UIButton *)sender { [self dismissViewControllerAnimated:YES completion:nil]; } - (void)drawTriangle{ UIBezierPath* trianglePath =

问题 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

问题 I have been doing some experimenting with iOS drawing. To do a practical exercise I wrote a BarChart component. The following is the class diagram (well, I wasnt allowed to upload images) so let me write it in words. I have a NGBarChartView which inherits from UIView has 2 protocols NGBarChartViewDataSource and NGBarChartViewDelegate. And the code is at https://github.com/mraghuram/NELGPieChart/blob/master/NELGPieChart/NGBarChartView.m To draw the barChart, I have created each barChart as a

问题 I have one problem. I look for the answers on the net and I don't understand why is not working. I must do some stupid mistake which I can't figure it out. if I make : - (void)viewDidLoad { [super viewDidLoad]; UIView * view = [[UIView alloc]initWithFrame:CGRectMake(10, 10, 300, 400)]; view.backgroundColor = [UIColor blueColor]; [self.view addSubview:view]; } it create blue view on the screen, but if I make - (void)viewDidLoad { [super viewDidLoad]; UIView * view = [[UIView alloc

问题 is there a nice way to calculate the position of a path (CGPath or UIBezierPath) at a given time (from 0 to 1)? Using CAShapeLayer for example, one can create an animated stroke end. I want to know the position of that stroke end at arbitrary times. Thanks in advance, Adrian 回答1: You can definitely base your approach on the CADisplayLink and a tracking layer. However, if you don't mind doing a little bit of math on your own, the solution is not too complicated. Plus, you wont have to depend

问题 I want to simulate eraser effect with touch event to show a image that behind something block on top, eg, gray color; Something like that: I have find for a long time for the solution but I can't do it well. following is my custom view code: CustomView.m: -(id)initWithCoder:(NSCoder *)aDecoder { if (self = [super initWithCoder:aDecoder]) { [self setup]; } return self; } -(id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { [self setup]; } return self; } -(void