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Questions tagged [cglayer]

90 questions
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Getting blur stroked while drawing in Cglayer

I am working with a drawing app where I draw inside CGlayers and then draw on grahics context, but I drawing is getting blurred. Here is my code - (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext();//Get a reference…
Ranjit
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Drawing a CGLayer outside the method drawRect: faster?

I'm not really sure, what am I asking... ...but if make layer composites in separate methods, and draw them to the view also outside of the drawRect: method... ...then could my app performance get raised? I'm actually subclassed a puzzlePiece:UIView…
Geri Borbás
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iOS Load CGImage into CGLayer and draw on top

I need to load an image into a CGLayer and draw some paths over it. The below code doesn't quite work: it doesn't allow me to draw the paths over the image (there are gaps in the paths). Please see the below image. The black square is an image…
Simon
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The antialias of rotated CGImage/CGlayer seems jaggy, UIImageView's is not

I need to mask a "texture" image with a rotated greyscale image. I found out, that I have to do it with CGImages or CGlayers (if there is a simplier way using UIImageViews only, please let me know about it). My problem is simple: The antialias of…
Geri Borbás
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iOS render image in context not working as expected in landscape orientation

The code below seems to work well to render an image from a view at retina resolution. The problem is it does not seem to work while my device is in landscape orientation. It returns an image rotated 90 degrees. Do I need to add options for image…
OWolf
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When to retain and release CGLayerRef?

I have a question similar to this one: CGLayerRef in NSValue - when to call retain() or release()? I am drawing 24 circles as radial gradients in a view. To speed it up I am drawing the gradient into a layer and then drawing the layer 24 times. …
Steve Ravet
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CGLayerRelease crashes

I have a Cocoa app with ARC enabled. I am using OS 10.8 and Xcode 4.4. The app sporadically crashes upon calls to CGLayerRelease, dumping messages like the following to console: error for object 0x10a2d2000: entry for pointer being freed from…
Ruben
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How to store CGLayers in Drawing

I am working with CgLayers for drawing in iOS, Now I want to store these layers and retrieve it later, so I want to know what are the available options. I tried to use NSMutableDictionary, below is the code, - (void)touchesEnded:(NSSet *)touches…
Ranjit
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How to use CgLayer for optimal drawing

I have created a simple drawing project,the code works fine, but I want to cache the drawing into CGlayer, because I read that its more efficient way in drawing . I have read through the documents, but not able to understand it properly. So friends,…
Ranjit
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iOS: How Can I Rotate A CGLayer?

I have been looking far and wide for the answer. I'm still coming up to speed on iOS dev, so I can definitely accept that I may be clooless here. However, the complete and utter lack of answers out there makes me wonder if there actually is an…
Chris Marshall
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Create CGContext for CGLayer

I want to pre-render some graphics into CGLayer for fast drawing in future. I found that CGLayerCreateWithContext requires a CGContext parameter. It can be easily found in drawRect: method. But I need to create a CGLayer outside of drawRect:.…
PDaria
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Why CGlayerRef or CGcontextRef can't be saved in NSdata?

I saved CGlayerRef and CGcontextRef in NSdata, and when I get them to cover the current one,I find that only the poiners were saved but not the data. For that reason, I can't make these CGlayerRef or CGcontextRef as a copy.(I did this all in…
dasheinz
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Strange behavior of CGLayerCreateWithContext on iPad 2 vs on the New iPad?

In a Single View App, FooView is the main view. In FooView's drawRect, if I do if (!self.layer1) { CGContextRef context = UIGraphicsGetCurrentContext(); NSLog(@"current context is drawRect is %@", context); self.layer1 =…
nonopolarity
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On iOS, why do we have to create a layer using an existing Graphics Context?

Possible Duplicate: On iOS, after we create a layer from context and get the layer's context, how do these contexts relate to each other? On iOS, we could do a CGLayerCreateWithContext using the existing Graphics Context, and we would get a…
Jeremy L
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How to display a UIView when it overlaps another iOS?

I am trying to re-implement something similar to the Apple Watch Friend Picker. I have two UIViews, both with a corner radius of half their height so they appear as circles. How do I calculate where they overlap and only show that part. My UI is in…
Big_Mac
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