catiledlayer

I'd like to present and allow the user to zoom large images on the iPhone and iPad in much the same way that the Photos app works. I realize CATiledLayer is the goto class for this, but the aesthetic it uses won't work for my application. It renders tiles one after another, while the Photos app renders the whole screen at once (and shows a pixellated version during and after a zoom until the app can catch up). I could certainly implement a view which renders the image in the background after each zoom. However, once the source image gets to large, this will crash the app. So tiling is

I have a CATiledLayer that is used to display a PDF page (this CATiledLayer is the layer type of my UIView which is a subview of a UIScrollView). I want to add overlay markers on this page. So I add a sublayer to my CATiledLayer. This sublayer again hosts the different marker's layers and acts as a grouping layer. So graphically, I have: (keep in mind that I have multiple markers which are CALayers also, this is ascii art after all) pdf page (CATiledLayer) ---------------------- | CALayer | | +---------+ | | | +----+ | | | | |mker| | | | | +----+ | | | +---------+ | | | ----------------------

I have a CATiledLayer into which I render content in the following method - (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx I used the QuartzDemo code to draw a pattern. This works very well until I apply a rotation transform to the layer's parentLayer (a UIView): rotated: These zigzag artefacts become worse when I start drawing lines and texts into the CATiledLayer. I applied the transform as follows (I also tried using an affine transform on the view itself): self.containerView.layer.transform = CATransform3DMakeRotation(angleRadians, 0.0f, 0.0f, 1.0f); I transform the

In my app I'm trying to render text along a path; this is fine for most characters but not for Japanese (or anything non mac-Roman). I've been advised to use [NSString drawAtPoint] which displays the correct characters in my CATiledLayer; however, they dissapear after approximately 5 seconds. In this time I can zoom the layer and they scale properly, but they don't seem to get committed to the CATiledLayer like the rest of the text usually is. Before I render, I check the string and decide whether any of them will not be renderable. If I'm going to have issues, I use drawAtpoint instead: if (

I have a pdf reader app for the iPad where I am using a scrollview to display each page. I keep the page in view and one page either side of the page in view. I have seperate views for portrait and landscape views. The portrait view showns a single page and the landscape viewer shows 2 pages. When the iPad changes orientation I unload the view for the old orientation and load the view for the new orientation. So say it was in portrait view and then changes to landscape the app unloads the portrait view and loads the landscape view. This all works great except when the pdf's are large. The pdf

I'm generating a bunch of tiles for CATiledLayer . It takes about 11 seconds to generate 120 tiles at 256 x 256 with 4 levels of detail on an iPhone 4S. The image itself fits within 2048 x 2048. My bottleneck is UIImagePNGRepresentation . It takes about 0.10-0.15 seconds to generate every 256 x 256 image. I've tried generating multiple tiles on different background queue's, but this only cuts it down to about 9-10 seconds. I've also tried using the ImageIO framework with code like this: - (void)writeCGImage:(CGImageRef)image toURL:(NSURL*)url andOptions:(CFDictionaryRef) options {