2014/10/15 下午 10:11:10

iphone Programming Glossary: lookup

Retrieving a pixel alpha value for a UIImage

http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage

was in the context's buffer before CGContextSetBlendMode context kCGBlendModeCopy Edit after thinking You could do the lookup much more efficient by building the smallest possible CGBitmapContext 1x1 pixel maybe 8x8 have a try and translating the..

OpenGL ES 2.0 texture distortion on large geometry GL_REPEAT

http://stackoverflow.com/questions/11370074/opengl-es-2-0-texture-distortion-on-large-geometry-gl-repeat

in mid texture. That's how the hardware works. You can work around the issue by using nearest filter texture lookup in a fragment program which calculates the texture lookup modulo your texture tile size and position and does its linear..

iOS crash reports: atos not working as expected

http://stackoverflow.com/questions/13574933/ios-crash-reports-atos-not-working-as-expected

UIApplicationMain 11 MYAPP 0x0004934a main 70 12 MYAPP 0x000492fc start 36 The funny thing is when I use atos to lookup the line of code that corresponds to address locations 0x0006573a and 0x0004fb26 I get completely different match. The atos..

How can I fetch information about the app/song/video etc. from iTunes Store?

http://stackoverflow.com/questions/1460364/how-can-i-fetch-information-about-the-app-song-video-etc-from-itunes-store

iPhone fluid simulation

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

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 like this work on the iPhone's..

Suggestions on implementing an iPad magazine app

http://stackoverflow.com/questions/2853881/suggestions-on-implementing-an-ipad-magazine-app

magazine Sequential images PDF ebook I'll need to have some form of interactivity. I guess I could have some form of lookup table which would include information such as if the user taps on this page within these coordinates then launch this item...

iPhone - debugging “pointer being freed was not allocated” errors

http://stackoverflow.com/questions/295778/iphone-debugging-pointer-being-freed-was-not-allocated-errors

This will bring up instruments. Look at the Console log as provided by Xcode organizer. Once you get the crash lookup the memory address in instruments. You will see the entire history of mallocs frees on that object as well as links straight..

Not safe to lookup objc runtime data

http://stackoverflow.com/questions/3293523/not-safe-to-lookup-objc-runtime-data

safe to lookup objc runtime data Every now and then I start getting this error in the debugger constantly. Sometimes the debugger will..

Alternatives to NSHost in iPhone app

http://stackoverflow.com/questions/3434192/alternatives-to-nshost-in-iphone-app

You can use CFHost to achieve the same. On the top of the CFHost Reference is a cookbook recipe for making the lookup. The following code does very very basic synchronous resolution as yours above would with NSHost . Note that you don't want.. can render your app unresponsive because it doesn't return until it's resolved or the timeout hits. Use asynchronous lookup instead CFHostSetClient and CFHostScheduleWithRunLoop as described in the CFHost documentation above . Also depending on..

UITextField auto correction crash in iOS 4.3 on simulator

http://stackoverflow.com/questions/5257175/uitextfield-auto-correction-crash-in-ios-4-3-on-simulator

in UITextChecker checkSpellingOfString startingAt language wrap correction #4 0x0b335725 in TIInputManagerZephyr lookup_spellcheck_candidates KB String const #5 0x0b3353f3 in TIInputManagerZephyr lookup_static_dynamic_candidates KB String const.. 0x0b335725 in TIInputManagerZephyr lookup_spellcheck_candidates KB String const #5 0x0b3353f3 in TIInputManagerZephyr lookup_static_dynamic_candidates KB String const KB String const KB Vector KB FPoint const bool #6 0x0b332b2b in TIInputManager.. KB String const KB String const KB Vector KB FPoint const bool #6 0x0b332b2b in TIInputManager lookup #7 0x0b332e18 in TIInputManager autocorrection #8 0x0b34a06b in TIKeyboardInputManagerZephyr autocorrection #9 0x005cfbe8..

What are the Dangers of Method Swizzling in Objective C?

http://stackoverflow.com/questions/5339276/what-are-the-dangers-of-method-swizzling-in-objective-c

to use a trampoline in the case where the implementation isn't already defined in the class and have the trampoline lookup and call the super class method properly. Defining the method so it dynamically looks up the super implementation will ensure..

Reachability causes crash after no network situation — how to properly use Reachability asynchronously

http://stackoverflow.com/questions/5900181/reachability-causes-crash-after-no-network-situation-how-to-properly-use-reac

Watchdog. That's because to do the reachability check the SCNetworkReachability functionality needs to do a DNS lookup which can take up to 30 seconds. If check reachability on the main thread i.e. in viewDidAppear you block the main thread..

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

of using the step function now that I have fewer fragments to discard due to the octagons. This combined with a depth lookup texture for the sphere now leads to a 2 ms average rendering time on the iPad 1 for the depth texture generation for my..

How to find Location using Zipcode?

http://stackoverflow.com/questions/6172199/how-to-find-location-using-zipcode

I don't develop for this platform so I can't give specifics using Apple's location API or if you really want to do a lookup by zipcode you might want to look at Google's Geocoding API . Keep in mind that Google's services are by no means the only..

Generating cryptographically secure authentication tokens

http://stackoverflow.com/questions/840537/generating-cryptographically-secure-authentication-tokens

SHA 256 etc a random string and store it in the database for the given user along with an expiration date. Do a simple lookup of the token on subsequent requests to make sure it matches. Encrypte the user id and some additional information timestamp..

Will my iPhone app take a performance hit if I use Objective-C for low level code?

http://stackoverflow.com/questions/926728/will-my-iphone-app-take-a-performance-hit-if-i-use-objective-c-for-low-level-cod

C but this is a larger question of comparing two object oriented languages to each other. For example is a C vtable lookup really faster than an Obj C message How much faster Threading polymorphism sorting etc. Before I go on a quest to build..