What does yellow tinting represent when using “color misaligned images” on iPhone/iOS
Magenta overlays are caused by subpixel misalignment, while yellow overlays are caused by stretching. Prior to iOS 4, Instruments used magenta for both.
core-graphics
Create a rectangle with just two rounded corners in swift?
Update: See this answer below for Swift 4 / iOS 11 which is much, much easier Here’s a quick Swift 3 extension you can use to do rounding and optional borders. Note: if you’re using autolayout, you may need to call this in one of the view lifecycle callbacks like viewDidLayoutSubviews or layoutSubviews after the … Read more
Rounded Corners only on Top of a UIView
You can do this by setting a mask on your view’s layer: CAShapeLayer * maskLayer = [CAShapeLayer layer]; maskLayer.path = [UIBezierPath bezierPathWithRoundedRect: self.bounds byRoundingCorners: UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii: (CGSize){10.0, 10.}].CGPath; self.layer.mask = maskLayer; IMPORTANT: You should do this in your view’s layoutSubviews() method, so the view has already been resized from the storyboard In Swift … Read more
What’s the difference and compatibility of CGLayer and CALayer?
They are completely different, and not compatible. To be absolutely clear: it is strictly a coincidence that the word “layer” is used in both names; they are completely unrelated. CGLayers are a “special” “high performance” thingy. You could consider them “like bitmaps, but better.” Apple sat down and said “We’re sick of people using bitmaps, … Read more
Getting a screenshot of a UIScrollView, including offscreen parts
Here is code that works … – (IBAction) renderScrollViewToImage { UIImage* image = nil; UIGraphicsBeginImageContext(_scrollView.contentSize); { CGPoint savedContentOffset = _scrollView.contentOffset; CGRect savedFrame = _scrollView.frame; _scrollView.contentOffset = CGPointZero; _scrollView.frame = CGRectMake(0, 0, _scrollView.contentSize.width, _scrollView.contentSize.height); [_scrollView.layer renderInContext: UIGraphicsGetCurrentContext()]; image = UIGraphicsGetImageFromCurrentImageContext(); _scrollView.contentOffset = savedContentOffset; _scrollView.frame = savedFrame; } UIGraphicsEndImageContext(); if (image != nil) { [UIImagePNGRepresentation(image) writeToFile: @”/tmp/test.png” … Read more
How to merge two UIImages?
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 🙂
Detecting CGAssociateMouseAndMouseCursorPosition
I dont know if this can help you There is an option called Focus Follows Mouse Focus Follows Mouse – The Mouse pointer will grab automatically change focus to a new window inisde this one app if you mouse over it, instead of having to click a window to get focus, then clicking to do … Read more
Create and export an animated gif via iOS?
You can create an animated GIF using the Image I/O framework (which is part of the iOS SDK). You will also want to include the MobileCoreServices framework, which defines the GIF type constant. You need to add these frameworks to your target, and import their headers in the file where you want to create the … Read more
Draw segments from a circle or donut
There are many parts to your question. Getting the path Creating the path for such a segment shouldn’t be too hard. There are two arcs and two straight lines. I’ve previously explained how you can break down a path like that so I won’t do it here. Instead I’m going to be fancy and create … Read more
How to Convert UIImage to CIImage and vice versa
CIImage *ciImage = [UIImage imageNamed:@”test.png”].CIImage; UIImage *uiImage = [[UIImage alloc] initWithCIImage:ciImage]; To fix the case where myUIImage.CIImage returns nil like [UIImageView image], you can instead do [CIImage imageWithCGImage:myUIImage.CGImage] – Dylan Hand Swift version: let ciImage = UIImage(named: “test.png”)!.ciImage let uiImage = UIImage(ciImage: ciImage) To fix the case where myUIImage.ciImage returns nil like you can instead … Read more