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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Finally, call the path drawing and layer set up code, and then it add the layer to the view hierarchy. The following diagram gives you an idea of Pholio used tiling for large photos. I’m running into an issue with using CATiledLayer On demand, I would spawn a background thread to generate tiles of photos.
You use this filter when enlarging the image via contentsGravitywhich can be used to change both size resize, resize aspect, and resize aspect fill and position center, top, top-right, right, etc. My first attempt at handling large images relied upon tiling. Layers are not part of the responder chain so they won’t directly react to touches or gestures like views can, as you saw in the CALayerPlayground example.
Next write a function that applies a rotation based on specified x and y offsets. The label is rendered for catilwdlayer purposes only. Each defaults to 0, and that effectively preserves color value across all instances. As always, if you have any questions or comments about this article or working with layers, join in on the discussion below!
Things that were not immediately catjledlayer to me. Here’s a sneak peak of some juicy examples:. I carefully prioritized generating tiles for the lowest level of detail first, so I would maximize responsiveness to the user. Create some helper code to create each side layer of a cube with the specified color, and to convert degrees to radians.
CATiledLayer – Core Animation | Apple Developer Documentation
I’m glad you asked, sort of: 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 overriding fadeDuration to return But hit testing is all a layer can do because it cannot react to recognized gestures. Next, draw the shape layer’s path.
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.
Simply because I find it more intuitive to work with degrees than radians. This code behaves a little strangely on my device iPhone 3G running iOS 3.
This property does not exist in runtime environments prior to exxample 4. The cached value is based on the previous “data source” just the tile color in this examplerather catjledlayer the updated data source.
I needed a new approach. In other cagiledlayer, an x value of 1 means the point is at the right edge of the layer, and a y value of 1 means the point is at the bottom edge of the layer.
Finally, to create a little visual interest in the absence of zooming recode viewDidLoad to look like this: Post as actiledlayer guest Name. With those tiles in place, a custom UIView subclass can be created to draw those tile layers:.
If the photographer is using an iPad examplee, with MB of RAM, the device will be straining to show even one full resolution photo. Note this is just a simple example to get you started. At its core, I use code from the great tutorial at Cocoa is my Girlfriend.
Pholio Coder’s Guide: Tiling Large Images
Layer Player also includes playback controls:. The previous changes are not animated, and if isGeometryFlipped is not set to truethe positional geometry and shadow will be upside-down.
UIView takes care of many things including layout or handling touch events. As you can see in the above animation, though, there is noticeable blockiness when fast-scrolling as individual tiles are drawn. 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:.
CALayer has several properties that let you customize its appearance. Pretty cool effect with just a cattiledlayer lines of code, eh?
CALayer Tutorial for iOS: Getting Started |
However, in this case, the instance color was originally set to white, meaning red, green and blue are 1. Here’s an example of creating an AVPlayerLayer:. Download this simple project which is just a single view app with a view inserted in the center.
You do this by drawing from point to point using methods like move to: I did eexample my device testing on an iPad 2, which has twice the memory of the iPad 1. In the above code, you create catilexlayer gradient layer, match its frame to the bounds of someViewassign an array of colors, set start and end points, examplr add the gradient layer to the view hierarchy.