2014/10/15 下午 10:08:11
iphone Programming Glossary: encapsulatesHardware accelerated h.264 decoding to texture, overlay or similar in iOS http://stackoverflow.com/questions/10646657/hardware-accelerated-h-264-decoding-to-texture-overlay-or-similar-in-ios Store. However you don't have to roll your own implementation of this. My BSD licensed open source framework GPUImage encapsulates these operations and handles all of this for you. You create a GPUImageMovie instance for your input H.264 movie attach..
Export SQLite data to Excel in iOS programmatically http://stackoverflow.com/questions/11132900/export-sqlite-data-to-excel-in-ios-programmatically self cancelButtonTitle @ Ok otherButtonTitles nil warning show warning release And then I have a class that encapsulates all my SQLite data. This class is the only one that makes sqlite calls. In this class I have a method for exporting data..
http://stackoverflow.com/questions/2406175/why-is-uiapplicationwillchangestatusbarframenotification-not-sent-when-the-statu application is about to change the frame of the status bar. The userInfo dictionary contains an NSValue object that encapsulates a CGRect structure expressing the location and size of the new status bar frame. Use UIApplicationStatusBarFrameUserInfoKey..
NSDate expressed in different time zones, i.e. local time zone (GMT-400) to PST http://stackoverflow.com/questions/2503397/nsdate-expressed-in-different-time-zones-i-e-local-time-zone-gmt-400-to-pst nsdate share improve this question NSDate always returns relative to GMT This doesn't make sense. NSDate just encapsulates an absolute moment in time let's forget about relativity for a second and it has no concept of time zones whatsoever. To..
Saving Geotag info with photo on iOS4.1 http://stackoverflow.com/questions/3884060/saving-geotag-info-with-photo-on-ios4-1 Unfortunately there is no documentation or sample code that describes how to form the metadata NSDictionary that encapsulates the GPS coordinates. Can somebody post a sample code that is known to work I have also tried using iPhone Exif library to..
How can you track motion using the iPhone's camera? http://stackoverflow.com/questions/3933716/how-can-you-track-motion-using-the-iphones-camera object. As an update to the above in the two years since I wrote this I've now developed an open source framework that encapsulates OpenGL ES 2.0 shader processing of images and video. One of the recent additions to that is a GPUImageMotionDetector class..
How do I convert the live video feed from the iPhone camera to grayscale? http://stackoverflow.com/questions/4381513/how-do-i-convert-the-live-video-feed-from-the-iphone-camera-to-grayscale 4 FPS if you rely on CPU bound code to do this. Since I wrote the above I've now created an open source framework that encapsulates this OpenGL ES 2.0 video processing and it has a built in grayscale filter that you can use for this. You can use a GPUImageGrayscaleFilter..
Highlighting a UIControl subclass http://stackoverflow.com/questions/4428437/highlighting-a-uicontrol-subclass basically I need an image button specifically a custom object that 1 calls a controller's action when tapped 2 encapsulates custom data 3 is automatically moved by wrapper view not relevant Well I got all this with a subclass of UIControl since..
How to apply “filters” to AVCaptureVideoPreviewLayer http://stackoverflow.com/questions/5156872/how-to-apply-filters-to-avcapturevideopreviewlayer 1.1 pipeline. Edit 2 13 2012 As an update on the above I've now created an open source framework called GPUImage that encapsulates this kind of custom image filtering. It also handles capturing video and displaying it to the screen after being filtered..
Use of VAO around VBO in Open ES iPhone app Causes EXC_BAD_ACCESS When Call to glDrawElements http://stackoverflow.com/questions/6240863/use-of-vao-around-vbo-in-open-es-iphone-app-causes-exc-bad-access-when-call-to-g 0 from the end of your setup function. Per the specification for OES_vertex_array_object a vertex array object encapsulates all state except the array buffer binding 1 so there is no element buffer bound at the time that you 胩e drawing whereas..
iPhone UIWebView - How do you set the zoom level and position? http://stackoverflow.com/questions/674368/iphone-uiwebview-how-do-you-set-the-zoom-level-and-position have a detailed discussion of how and why UIScrollView zooming works an example project and ZoomScrollView class that encapsulates the required zooming magic at github.com andreyvit ScrollingMadness . So probably you should put your images inside UIScrollView..
Converting a UIImage black'n white and not grayscale for using tesseract http://stackoverflow.com/questions/9992078/converting-a-uiimage-blackn-white-and-not-grayscale-for-using-tesseract way to do this would be to use OpenGL ES 2.0 shaders to apply the threshold to your image. My GPUImage framework encapsulates this so that you don't need to worry about the more technical aspects behind the scenes. Using GPUImage you could obtain..
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