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2014/10/15 ¤U¤È 10:13:19
iphone Programming Glossary: representationsDecimal point in UIKeyboardTypeDecimalPad can't be used in mathematical calculation http://stackoverflow.com/questions/11487850/decimal-point-in-uikeyboardtypedecimalpad-cant-be-used-in-mathematical-calculat A scanner bases some of its scanning behavior on a locale which specifies a language and conventions for value representations. NSScanner uses only the locale ™s definition for the decimal separator given by the key named NSDecimalSeparator . You can..
Improving Finger Painting Performance http://stackoverflow.com/questions/1355527/improving-finger-painting-performance 2 dimensional C array representing the entire screen is the most obvious. You may also want to look into bitmap image representations and draw directly into a CGImage rather than maintaining a bunch of CGPoints. Take a look at the Quartz 2D Programming Guide..
iPhone button with non-rectangle shape? http://stackoverflow.com/questions/1561585/iphone-button-with-non-rectangle-shape image and get a bitmap representation of it buttonImage NSImage imageNamed @ myButtonImage buttonImageRep buttonImage representations objectAtIndex 0 Then you can draw it to the control's view where stateImage is a pointer to the image that must be drawn..
Using quaternion instead of roll, pitch and yaw to track device motion http://stackoverflow.com/questions/19239482/using-quaternion-instead-of-roll-pitch-and-yaw-to-track-device-motion especially interested in small values. Maybe it's worth to emphasize that every 3D rotation has two unit quaternion representations q and q . This might be confusing but doesn't matter. Update So a bit of pseudo code would look something like CMQuaternion..
Core data images from desktop to iphone http://stackoverflow.com/questions/2271195/core-data-images-from-desktop-to-iphone you are handling it data. You need to convert it to a standard format first like this NSBitmapImageRep bits myImage representations objectAtIndex 0 NSData data bits representationUsingType NSPNGFileType properties nil myManagedObject setImage data I recommend.. @ image return image #else void setImage NSImage image self willChangeValueForKey @ image NSBitmapImageRep bits image representations objectAtIndex 0 NSData data bits representationUsingType NSPNGFileType properties nil myManagedObject setImage data self..
Cocoa Touch - Comparing Images http://stackoverflow.com/questions/3400707/cocoa-touch-comparing-images cocoa touch uiimage share improve this question If you have two UIImages you should get their CGImageRef quartz representations from those objects. Then create two new bitmap contexts backed by a memory buffer that you create and pass in one for each..
How can I improve the performance of my custom OpenGL ES 2.0 depth texture generation? http://stackoverflow.com/questions/6051237/how-can-i-improve-the-performance-of-my-custom-opengl-es-2-0-depth-texture-gener depth texture generation I have an open source iOS application that uses custom OpenGL ES 2.0 shaders to display 3 D representations of molecular structures. It does this by using procedurally generated sphere and cylinder impostors drawn over rectangles..
Objective-C get a class property from string http://stackoverflow.com/questions/6179427/objective-c-get-a-class-property-from-string improve this question The Key Value Coding mechanism allows you to interact with a class's properties using string representations of the property names. So for example if your Record class has a property called column1 you can access that property as..
http://stackoverflow.com/questions/7362199/iphone-correct-way-for-getting-current-date-and-time-for-a-given-place-timez time zones. NSDate objects represent an absolute instant in time. Consider the following example of how two date representations in different time zones 9 9 11 3 54 PM in Paris and 9 9 11 11 54 PM in Sydney are actually the same date. NSDateFormatter..
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