Hope this may help you, var bottomImage = UIImage(named: “bottom.png”) var topImage = UIImage(named: “top.png”) var size = CGSize(width: 300, height: 300) UIGraphicsBeginImageContext(size) let areaSize = CGRect(x: 0, y: 0, width: size.width, height: size.height) bottomImage!.draw(in: areaSize) topImage!.draw(in: areaSize, blendMode: .normal, alpha: 0.8) var newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()! UIGraphicsEndImageContext() All the Best 🙂
Yes, yes there is… If you want both a corner radius and a drop shadow, you don’t turn on -masksToBounds, but rather set the corner radius and set the bezier path of the shadow with a rounded rect. Keep the radius of the two the same: [layer setShadowOffset:CGSizeMake(0, 3)]; [layer setShadowOpacity:0.4]; [layer setShadowRadius:3.0f]; [layer setShouldRasterize:YES]; … Read more
[Note: The code on the github example does not calculate the gradient on a pixel basis. The code on the github example calculates the gradient on a points basis. -Fattie] The code is working in pixels. First, it fills a simple raster bitmap buffer with the pixel color data. That obviously has no notion of … Read more
Yes, on iOS Core Graphics (Quartz) appears to be layered on top of OpenGL ES for drawing that targets the screen, although not in an explicit way that we have access to. Core Graphics takes vector elements (lines, arcs, etc.) and some raster ones (images) and processes them for display to the screen or for … Read more
The callback parameter of CGEventTapCreate() is a C function pointer, and in Swift 1.x it is not possible call it with a Swift function argument. However, in Swift 2 (Xcode 7), C functions that take function pointer arguments can be called using closures or global functions (with the restriction that the closure must not capture … Read more
CGContextFillRect(context, CGRectMake(x,y,1,1));
The mask layer doesn’t get drawn, just used to compute the mask. Try: -(void)roundCorners:(UIRectCorner)corners radius:(CGFloat)radius { CGRect bounds = self.bounds; UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:corners cornerRadii:CGSizeMake(radius, radius)]; CAShapeLayer *maskLayer = [CAShapeLayer layer]; maskLayer.frame = bounds; maskLayer.path = maskPath.CGPath; self.layer.mask = maskLayer; CAShapeLayer* frameLayer = [CAShapeLayer layer]; frameLayer.frame = bounds; frameLayer.path = maskPath.CGPath; frameLayer.strokeColor = … Read more
You need to setup the graphics context first: UIGraphicsBeginImageContext(myView.bounds.size); [myView.layer renderInContext:UIGraphicsGetCurrentContext()]; viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();
NSImage size method returns size information that is screen resolution dependent. To get the size represented in the actual file image you need to use an NSImageRep. You can get an NSImageRep from an NSImage using the representations method. Alternatively you can create a NSBitmapImageRep subclass instance directly like this: NSArray * imageReps = [NSBitmapImageRep … Read more
You could use the path of your shape to create a masking layer and apply that on the gradient layer, like this: UIView *v = [[UIView alloc] initWithFrame:self.window.frame]; CAShapeLayer *gradientMask = [CAShapeLayer layer]; gradientMask.fillColor = [[UIColor clearColor] CGColor]; gradientMask.strokeColor = [[UIColor blackColor] CGColor]; gradientMask.lineWidth = 4; gradientMask.frame = CGRectMake(0, 0, v.bounds.size.width, v.bounds.size.height); CGMutablePathRef t = … Read more