cgcontext
How can I remove a UIView with rounded corners from its parent view?
I\'m creating an iPad app for 3.2 and later. My app has an overlay view which has a semi-transparency that makes everything below it darker. In the middle of this view I am chopping a hole in this sem[详细]
2023-01-28 01:43 分类:问答Why does my CGContext-drawn circle suck?
I have a custom table view cell that is intended to draw a circle like the iPhone’s Mail.app does: Instead, it draws like this:[详细]
2023-01-27 20:37 分类:问答Getting 0 values for RGB when trying to change pixels in an CGImageRef data
Hi guys I am getting 0 for RGB values in this code. Any idea why? The inImage was created with this CGContext.[详细]
2023-01-27 05:41 分类:问答How to get a global(screen, device) coordinates with CGContext?
I try to make a plugin for browsers in Mac OSX. I got a CGContext from browser process. So I ca开发者_JS百科n draw with it.[详细]
2023-01-26 09:12 分类:问答Thread Safe (CG) Version of UIGraphicsGetImageFromCurrentImageContext?
Im trying to render PDF pages to imag开发者_如何学Pythones on a background thread, is there a thread safe way of generating an image from a pdfContext/context that doesn\'t not use:[详细]
2023-01-26 05:48 分类:问答Is CGContextAddArc really that slow (compared to a circle drawn with a few lines
Folks, While coding up a few dials and sliders (e.g. like a big volume button one can rotate around) - I found that the standard CGContextAddArc() used like:[详细]
2023-01-25 06:06 分类:问答UIColor in SetStrokeColorWithColor triggers EXC_BAD_ACCESS - memory issue?
I have a large line to draw that the colour changes along the line. Now and again I get EXC_BAD_ACCESS on the 4th line of the code there.[详细]
2023-01-23 19:17 分类:问答-
Drawing in CATiledLayer with CoreGraphics CGContextDrawImage
I would like to use a CATiledLayer in iPhone OS 3.1.3 and to do so all drawing in -(void)drawLayer:(CALayer *)layer inContext:(CGContext)context has to be done with coregraphics only.[详细]
2023-01-23 02:55 分类:问答 Copying the drawn contents of one UIView to another
I\'d like to take a UITextView and allow the user to enter text into it and then trigger a copy of the contents onto a quartz bitmap context.Does anyone know how I can perform this copy action?Should[详细]
2023-01-22 01:19 分类:问答Set background color in table view while using Core Graphics to add vertical lines for grid
I\'m attempting to create a grid-style table using the UITableView by overwriting vertical lines on top of the standard horizontal lines provided by default in a UITableView. I am adapting my code to[详细]
2023-01-17 19:43 分类:问答