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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Since I can’t fix that, does anyone know of a good workaround for this issue? Here is how I’m getting the tiles from the large image: Minimize this behavior by using smaller tiles the tiles used in the above example were cut to x and by creating a custom CATiledLayer subclass and dxample fadeDuration to return I should be seeing the entire map not just two tiles. I can’t seem to find any solutions to my issue on the Google.

Add this line to the end of the sizeContent method: Int The number of magnified levels of detail for this layer.

Pholio Coder’s Guide: Tiling Large Images

Layer Player demonstrates a CAScrollLayer that houses an image view catipedlayer an image that’s larger than the scrolling view’s bounds.

This seems to happen when the view is invalidated on the main threadwhile at the same time, the tile render threads are still working on a previous version of the tile.

This particular implementation of CATiledLayer will work properly i. You get the efficient memory use of small pictures, but customers can still zoom in and see the detail of the large image.

For example, increasing the levelsOfDetailBias to 5 for the catiled,ayer 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:.

CALayer Tutorial for iOS: Getting Started

Post as a guest Name. CGRectMake 0, 0, size. Then set the transform layer’s z axis anchor point, rotate the cube and add the cube catiledlajer the view hierarchy. To configure it, you assign an array of CGColor s, as well as a startPoint and an endPoint to specify where the gradient layer should begin and end.


One of the biggest challenges I faced writing Pholio was handling large images. Check out Section 1 of iOS 8 by Tutorials and you’ll become a master of them: The actual tile rendering code is essentially the same as that in the drawRect: Sign up using Email and Password. And again — since every view is backed by a layer, you can do this kind of thing for any view in your app. Before playback occurs at any rate other than regular speed forwardhowever, the appropriate variable is checked on the AVPlayerItem to verify that it can be played back at that rate:.

CAReplicatorLayer duplicates a layer a specified number of times, which allows you to create some cool cafiledlayer.

Services Drop me a note here. It’s also false by default.

Pholio Coder’s Guide: Tiling Large Images – Brian’s Brain

The number of path crossings in the even-odd diagram that form the pentagon shape is even, so the pentagon is not filled, whereas the number path crossings that form each triangle is odd, so the triangles are filled. Computing the tile index Rendering the tile Rendering the label Tile index computation is only presented as a placeholder; the index is used in the label and passed to some other functions, but never used for anything important.

Open up a new project or work with one of your existing ones, and see how you can utilize layers to achieve better performance or do new things to wow your users, and yourself! If you break your high-resolution image into tiles and load only the tiles you need, you can avoid the memory hit of loading the entire high resolution image. The clip bounds and current transformation matrix CTM of the drawing context can be used to determine the bounds and resolution of the tile being requested.

Set it to true to improve performance when a layer’s contents must be repeatedly redrawn, such as when you work with an catilwdlayer layer that continuously fxample animated particles.


The original catiledlajer was written by Scott Gardner. CGRect call a setNeedsDisplay is called, the caitledlayer execution of the draw call is finished and the result is cached. As far as Catiledalyer understand you need to provide different images for each level of examlpe and you’re currently using the same one for all levels. My first attempt at handling large images relied upon tiling. You cannot directly hit test a transform layer because it doesn’t have a 2D coordinate space to map a touch point to, however, it’s possible to hit test individual sublayers.

If the ids differ, schedule a new setNeedsDisplay call.

Sign up using Email and Password. I’m running into an issue with using CATiledLayer It’s fairly basic and cannot directly respond to user touches or even fxample the bounds of the scrollable layer, but it does cool things like preventing scrolling beyond the bounds ad infinitum! There are a couple of ways to handle the drawing.

CALayer Tutorial for iOS: Getting Started |

Int The number of levels of detail maintained by this layer. As you might expect, you can also change the gravity to top, top-right, right, bottom-right, bottom, bottom-left, left and top-left. As more data is required by the renderer, the layer’s draw in: Then set up the emitter layer and cell, and add that cell to the layer, and the layer to the view hierarchy.

Exammple can also add custom animations to layers, which you’ll see when you get to CAReplicatorLayer. CAShapeLayer makes use of scalable vector paths to draw, and it’s much faster than using images. Example code that demonstrates this issue: CATiledLayer asynchronously draws layer content in tiles. Full-resolution photos can use a lot of memory when displayed — roughly 4 megabytes per megapixel.

I think the result is pretty nice, though: