¡@

Home 

2014/10/15 ¤U¤È 10:04:36

iphone Programming Glossary: bitwise

What's the difference between NSNumber and NSInteger?

http://stackoverflow.com/questions/1285098/whats-the-difference-between-nsnumber-and-nsinteger

it's unsigned he she has more freedom to perform operations that might be unreliable in the signed case including bitwise operations such as shifting. This blog post talks more about signed vs unsigned. My guess about CGFloat vs NSFloat which..

iPhone fluid simulation

http://stackoverflow.com/questions/1784745/iphone-fluid-simulation

compressible ones like air. Why this works well on limited hardware is that these calculations can be done using bitwise operators and simple lookup tables without the need for any floating point calculations. You might be able to make something..

How do those bitmasks actually work?

http://stackoverflow.com/questions/2555101/how-do-those-bitmasks-actually-work

how would that look iphone objective c cocoa cocoa touch share improve this question To do this you want to bitwise AND the value you're testing against the mask then see if the result of the ANDing equals the mask itself if options kCFCalendarUnitYear..

Setting direction for UISwipeGestureRecognizer

http://stackoverflow.com/questions/3319209/setting-direction-for-uiswipegesturerecognizer

You may specify multiple directions by specifying multiple UISwipeGestureRecognizerDirection constants using bitwise OR operands. The default direction is UISwipeGestureRecognizerDirectionRight. However for me it doesn't work. When all four..

Multiple value enum in Obj-C

http://stackoverflow.com/questions/4176149/multiple-value-enum-in-obj-c

UIButton setTitle:forState: question

http://stackoverflow.com/questions/4370466/uibutton-settitleforstate-question

you are saying the state property should be UIControlStateHighlighted OR UIControlStateDisabled but NOT both When you bitwise or them together you are stating they must BOTH be set in the state property. Meaning UIControlStateHighlighted AND UIControlStateDisabled..

Objective C alloc/release error

http://stackoverflow.com/questions/6928028/objective-c-alloc-release-error

NULL @ www.alues.com UTF8String SCNetworkReachabilityGetFlags reachability flags The reachability flags are a bitwise set of flags that contain the information about connection availability BOOL reachable flags kSCNetworkReachabilityFlagsConnectionRequired..