CATiledLayer uses different set of tiles to handle different levels of zoom This example is exactly what we left from previous part of this tutorial. Based on some further logging I’ve added to the example project, I think the problem is this: The CATiledLayer has two render threads that. Let’s take a look at a CATiledLayer demo. I first ran across the CATiledLayer class when I was looking into a multithreaded, tiled.

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Here is how I’m getting the tiles from the large image: To learn more about matrix transformations like those used in this example, check out 3DTransformFun project by fellow tutorial team member Rich Turton and Enter The Matrix project by Mark Pospesel. I have a large image, a map, that catildelayer x CAShapeLayer makes use of scalable vector paths to draw, and it’s much faster than using images.

CALayer Tutorial for iOS: Getting Started

The vast majority of the stuff you do in iOS is … well, not explicitly multithreaded, anyway; in fact, AAPL seems to be actively discouraging multithread techniques. That said, there are a fairly large number of things missing from, and issues unaddressed by, this demo.

I can’t seem to find any solutions to my issue on the Google. If locations is set, though, its count must match colors count, or else undesirable things will happen: And, finally, set the instance layer’s opacity to 0 so that it’s transparent until each instance is drawn and its color and alpha values are set.

Check out Section 1 of iOS 8 by Tutorials and you’ll become a master of them: The label is rendered for debugging purposes only. Notice how the star is centered — this is because you set the contentsGravity property to kCAGravityCenter.


Here you’re creating a positive or negative offset based on the user’s pinch, and then adjusting the size of the layer’s frame, width of its border and the border’s corner radius. With a block of code like this, it’s possible to manipulate the font, font size, color, alignment, wrapping and truncation, as well as animate the changes:.

I carefully prioritized generating tiles for the lowest level of detail first, so I would maximize responsiveness to the user. His PDF demo concisely illustrated how a CATiledLayer could be wired up and integrated into an application, and saved me no end of trouble.

An Apple support engineer provided me with a workaround: Setting rate to anything higher than 1 is equivalent to asking the player to exwmple playback at that number times regular speed, for instance, setting rate to 2 means double-speed. Then set the transform layer’s z axis anchor point, rotate the cube and add the cube to the view hierarchy.

ios – CATiledLayer shows previous tiles – Stack Overflow

The rendering of a tile can be expensive and can use the render thread for 10ms. Next, draw the shape layer’s path. Sign up or log in Sign up using Google. Build and run the project, just to ensure the old stuff still works. I first ran across the CATiledLayer exampoe when I was looking into a multithreaded, tiled, vector-graphics rendering solution for the Demine project.

Layer Player also includes playback controls:. And in case you’re curious to know what this drawing looks like in PaintCode:. Then a TilingViewForImagesized to the original image’s dimensions can be added to a scroll view.

For example, increasing the levelsOfDetailBias to 5 for the blurry tiled layer above would result in caching levels magnified at 2x, 4x, 8x, 16x and 32x, and the zoomed in layer would look like this:.


CATransformLayer does not flatten its sublayer hierarchy like other layer classes, so it’s handy for drawing 3D structures. Sign up using Facebook. I think the result is pretty nice, though: As you might expect, you can also change the gravity to top, top-right, right, bottom-right, bottom, bottom-left, left and top-left. Proudly powered by WordPress. After a few emails back and forth, I figured out why: Note this is just a simple example to get you started.

This basic operation visibility calculation is essential to any rendering engine. This is great for very large images or other sets of content where you are only looking at small bits at a time, because you can start seeing your content without having to load it all into memory.

Add this line to the end of the sizeContent method: As always, if you have any questions or comments about this article or working with layers, join in on the discussion below!

Delete these members and references to them: If left unspecified the stop locations default to evenly spaced. Finally, to create a little visual interest in the absence of zooming recode viewDidLoad to look like this: I needed a new approach. Sign up using Email and Password.

You may notice that we’re skipping over the next demo in the Layer Player app. CGRect call, compare the saved updateID with the current one. Next, set the replicator layer’s number of copies instanceCount and drawing delay.

Things that were not immediately obvious to me.

Layer Player includes controls to adjust all of the above-mentioned properties, and several more:.