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2014/10/15 ¤U¤È 10:11:00
iphone Programming Glossary: leadHow does the iOS app Display Recorder record the screen without using private API? http://stackoverflow.com/questions/11090184/how-does-the-ios-app-display-recorder-record-the-screen-without-using-private-ap the screen of an iOS device even while it is in the background. Given that UIGetScreenImage is private API and will lead to a rejection on application submission when detected by the static analysis Apple runs how were they able to do this recording.. an app that watches you as you type in your iTunes password is one example scary thought . I wonder if this will lead to a change in their reviewing process but we will likely never know. One thing that is interesting to me is that there..
Add UIPickerView & a Button in Action sheet - How? http://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how should you add views to its hierarchy I recommend against trying to customize the contents of an ActionSheet as it can lead to serious invalid context errors in iOS 7. I just spent a few hours working through this problem and ultimately decided..
How to access SOAP services from iPhone http://stackoverflow.com/questions/204465/how-to-access-soap-services-from-iphone some basic checking in the iPhone SDK I was not able to find any support for accessing SOAP services a bit of Googling lead to the conclusion that there is no support for SOAP in the iPhone SDK. So if I do want to build that app I'll need to come..
Delegates Vs. Notifications in iPhoneOS http://stackoverflow.com/questions/2232694/delegates-vs-notifications-in-iphoneos the second part I have used notifications but for this first I am trying to use a delegate because it so I have been lead to believe is a good programming practice. I am having trouble making it work and know that I can set up another notification..
CFNetwork and Bonjour integration for iPhone to Mac integration http://stackoverflow.com/questions/3240617/cfnetwork-and-bonjour-integration-for-iphone-to-mac-integration the iPhone app the label changes on the Mac app. Is there example code out there that can do this If not can someone lead me in the right direction Thanks iphone objective c osx bonjour cfnetwork share improve this question Bill Dudney created..
Getting displacement from accelerometer data with Core Motion http://stackoverflow.com/questions/4449565/getting-displacement-from-accelerometer-data-with-core-motion velocity because you will need it in a later stage for optimisation. Do it very careful because every tiny bug will lead to huge errors after short period of time. Always bear in mind that even a very small error e.g. 0.1 will grow rapidly after..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now that drawRect is run once only after step 6. What you want is for the ^ £@ @ view to be refreshed at point 5. This can lead to you smashing your ipops on the floor scanning Stackoverflow for hours screaming at the kids more than necessary about..
Animation in OpenGL ES view freezes when UIScrollView is dragged on iPhone http://stackoverflow.com/questions/4876488/animation-in-opengl-es-view-freezes-when-uiscrollview-is-dragged-on-iphone UITrackingRunLoopMode is considered one of the common modes. Spending too much time interrupting UIKit can lead to some very poor control responsiveness so you need to be careful. It'd be to diverge from the topic massively but although..
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 safer . Method swizzling can be used to write better more efficient more maintainable code. It can also be abused and lead to horrible bugs. Background As with all design patters if we are fully aware of the consequences of the pattern we are..
Am I abusing UIViewController Subclassing? http://stackoverflow.com/questions/5691226/am-i-abusing-uiviewcontroller-subclassing of the same view hierarchy you're using UIViewController in a way which was never intended and which is likely to lead to problems. The methods that you mentioned viewDidLoad viewWillAppear etc. are meant to tell the view controller that its..
How can I optimize the rendering of a large model in OpenGL ES 1.1? http://stackoverflow.com/questions/5718846/how-can-i-optimize-the-rendering-of-a-large-model-in-opengl-es-1-1 bottleneck is in the size of the geometry being sent to the GPU . Whatever you can do to shrink the geometry size can lead to an almost linear reduction in rendering time in my experience. These tuning steps have worked for me in the past If you're.. vertices and normals without losing much precision in the rendering. This will significantly compact your geometry and lead to a nice speed boost in rendering. Bin similarly colored vertices and render them as one group at a set color rather than.. glGet calls because they really mess with the flow of the PowerVR GPUs. There are other things you can do that will lead to smaller performance improvements like using interleaved vertex normal texture data in your VBOs aligning your data to..
What's the best approach to draw lines between views? http://stackoverflow.com/questions/5847876/whats-the-best-approach-to-draw-lines-between-views graphics calayer share improve this question Conceptually all your propositions are similar. All of them would lead to the following steps some of them done invisibly by UIKit Setup a bitmap context in memory. Use Core Graphics to draw.. Compose the layer view hierarchy using the GPU. The expensive part of the above steps are the first three points. They lead to repeated memory allocation memory copying and CPU GPU communication. On the other hand what you really want to do is..
Why is autorelease especially dangerous/expensive for iPhone applications? http://stackoverflow.com/questions/613583/why-is-autorelease-especially-dangerous-expensive-for-iphone-applications comment It sounds like there is a certain amount of overhead in maintaining the pool. I read this article which would lead me to probably avoid autorelease as much as possible because I prefer things to be consistent. If you have some memory under..
Do I need to release xib resources? http://stackoverflow.com/questions/61838/do-i-need-to-release-xib-resources variable directly self.anOutlet nil will be called in dealloc as well as in response to a memory warning... This will lead to a crash in dealloc . The remedy is to ensure that outlet variables are also set to nil in dealloc void dealloc release..
Moving a Stick figure, anchorpoints, animation, or something else…? http://stackoverflow.com/questions/7808981/moving-a-stick-figure-anchorpoints-animation-or-something-else means the position of that sprite is offset far to the left of where the actual image is being displayed. This can lead to collision check discrepancies in particular the above situation would entirely void radius based collision checks. This..
Why is object not dealloc'ed when using ARC + NSZombieEnabled http://stackoverflow.com/questions/8408071/why-is-object-not-dealloced-when-using-arc-nszombieenabled out I've written some serious nonsense If zombies worked like I originally wrote turning on zombies would directly lead to innumerable false positives... There is some isa swizzling going on probably in _objc_rootRelease so any override of.. .cxx_destruct to not be called at all at least that's what happened when I've edited your sample project zombies off leads to backtrace and both deallocs while zombies on yields no backtrace and only one dealloc. If you're interested the additional..
Is there any way to determine if the iphone is roaming? http://stackoverflow.com/questions/900547/is-there-any-way-to-determine-if-the-iphone-is-roaming key InternationalRoamingEDGE label EDGE_ROAMING_TOGGLE requiredCapabilities telephony This is certainly a lead as it appears I can sign up for notifications that the user has changed the InternationalRoaming settings. Still I'm not..
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