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2014/10/15 ¤U¤È 10:11:11
iphone Programming Glossary: lowhttp://stackoverflow.com/questions/1816144/uipagecontrol-help
What exactly must I do in viewDidUnload? http://stackoverflow.com/questions/2261972/what-exactly-must-i-do-in-viewdidunload things in your dealloc method as well as long as you set them to nil when you release them in viewDidUnload . The following quote from the Memory Management section of Apple's UIViewController documentation describes it in more detail ...in.. detail ...in iPhone OS 3.0 and later the viewDidUnload method may be a more appropriate place for most needs. When a low memory warning occurs the UIViewController class purges its views if it knows it can reload or recreate them again later...
iOS 4 app crashes at startup on iOS 3.1.3: Symbol not found: __NSConcreteStackBlock http://stackoverflow.com/questions/3313786/ios-4-app-crashes-at-startup-on-ios-3-1-3-symbol-not-found-nsconcretestackbl 431E B0E9 67C1F41FD5DA MyApp.app MyApp Expected in usr lib libSystem.B.dylib It appears to be an issue with a fairly low level dynamically linked library BEFORE my main function even gets called. I have even tried re starting the device etc...
Is it a problem when an iAd may be obscured? http://stackoverflow.com/questions/4160010/is-it-a-problem-when-an-iad-may-be-obscured it a problem when an iAd may be obscured I added the ADBannerView to a view and when I load the app I get the following message ADBannerView WARNING A banner view 0x7a023c0 has an ad but may be obscured. This message is only printed once..
Getting displacement from accelerometer data with Core Motion http://stackoverflow.com/questions/4449565/getting-displacement-from-accelerometer-data-with-core-motion and ended up with poor results. I am sure that there won't be an acceptable solution for either larger distances or slow motions lasting for more than 1 or 2 seconds. If you can live with some restrictions like small distances 10 cm and a given.. or a higher degree Newton Cotes formula. If you managed this you will have to keep an eye on setting up the right low pass filtering. I cannot give a general value but as a rule of thumb experimenting with filtering factors between 0.2 and.. greater than 0 without any acceleration. This is an unavoidable result of error propagation and can be handled by slowing down artificially that means introducing a virtual deceleration even if there is no real counterpart. A very simplified..
http://stackoverflow.com/questions/4949809/pdf-viewer-ipad-app like this which I've used for a handful of projects for clients. Search Highlight was by far the most difficult followed by text selection. Keeping memory usage low for large PDF's is tricky too. I cant share my source. But here's someone.. projects for clients. Search Highlight was by far the most difficult followed by text selection. Keeping memory usage low for large PDF's is tricky too. I cant share my source. But here's someone who has a free library that looks promising http..
Creating a JSON Store For iPhone http://stackoverflow.com/questions/5237943/creating-a-json-store-for-iphone lessor dimension volatility i.e. how often the data changes 1 If the size complexity and volatility of the data are low then using a collection e.g. NSArray NSDictionary NSSet of a serialized custom object would be the best option. Collections.. and all changes require rewriting the entire persistence file. 2 If the size is very large but the complexity is low then SQL or other database API can give superior performance. E.g. an old fashion library index card system. Each card is.. themselves and the cards have no behaviors. SQL or other procedural DBs are very good at processing large amounts of low complexity information. If the data is simple then SQL can handle even highly volatile data efficiently. If the UI is equally..
instruments with iOS: Why does Memory Monitor disagree with Allocations? http://stackoverflow.com/questions/5518918/instruments-with-ios-why-does-memory-monitor-disagree-with-allocations why there is such a big disagreement between these two tools Additionally is it possible to find the source of the low system memory or how to keep it from running out so quickly My app doesn't appear to be leaking memory but somehow it's..
How to record and play sound in iPhone app? http://stackoverflow.com/questions/5662297/how-to-record-and-play-sound-in-iphone-app I tried using AVAudioSession and AVAudioPlayer to record and play sounds respectively but the sound volume is very low. I tried putting volume value of AVAudioPlayer to 1.0 and more but didnt help much. What could be my other options to record..
iOS Low Memory Crash, but very low memory usage http://stackoverflow.com/questions/5980636/ios-low-memory-crash-but-very-low-memory-usage Low Memory Crash but very low memory usage This has been annoying me for a long time. My app runs taking up about 2.74MB of memory. That's fine. But.. given under Live Bytes in Instruments while running on my 1st gen iPad. There is no crash log that I can find. The following is from the console MyApp 1205 Warning Received memory warning. Level 1 MyApp 1205 Warning applicationDidReceiveMemoryWarning.. 30 Warning Application 'MyApp' exited abnormally with signal 9 Killed 9 configd 26 Debug CaptiveNetworkSupport UIAllowedNotifyCallback 70 uiallowed false ReportCrash 1206 Error libMobileGestalt loadBasebandMobileEquipmentInfo CommCenter error..
Example or explanation of Core Data Migration with multiple passes? http://stackoverflow.com/questions/5995231/example-or-explanation-of-core-data-migration-with-multiple-passes do the migration in two steps because it's taking long to migrate 2k entries and we like to keep the memory footprint low. You could even go ahead and split these mapping models further to migrate only ranges of the entities. Say we got one million.. the Migration Process it's just a merge of the first two code examples. The third and last part will be modified as follows Instead of using the class method of the NSMappingModel class mappingModelFromBundles forSourceModel destinationModel we..
http://stackoverflow.com/questions/6214725/iphone-call-log-history an error DB Error 23 authorization denied So this file must be sandboxed as I initially expected I searched high and low again but can't seem to find anything that will do... but these guyse seem to get away with it http itunes.apple.com us..
Need to find Distance using Gyro+Accelerometer http://stackoverflow.com/questions/6647314/need-to-find-distance-using-gyroaccelerometer in y and z and basic geometry is the Pythagorean theorem So once you have your accelerometer signals passed through a low pass filter and binned in time with sampling interval dt you can find the displacement in x as pardon my C... float dx 0.0f..
Last In-First Out Stack with GCD? http://stackoverflow.com/questions/7567827/last-in-first-out-stack-with-gcd using the nested dispatch_async as well. another potential optimization could be to start downloading the images on a low priority background queue when the app launches. i.e. in the ApplicationDidFinishLaunchingWithOptions method dispatch in.. queue as soon as we get onto the main queue so as not to block the main queue and therefore the UI dispatch_queue_t lowPriorityQueue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_BACKGROUND 0 dispatch_apply contactsCount lowPriorityQueue.. lowPriorityQueue dispatch_get_global_queue DISPATCH_QUEUE_PRIORITY_BACKGROUND 0 dispatch_apply contactsCount lowPriorityQueue ^ size_t idx skip the first 25 because they will be called almost immediately by the tableView if idx 24..
Correct Singleton Pattern Objective C (iOS)? http://stackoverflow.com/questions/7598820/correct-singleton-pattern-objective-c-ios found some information in the net to create a singleton class using GCD. Thats cool because it's thread safe with very low overhead. Sadly I could not find complete solutions but only snippets of the sharedInstance method. So I made my own class.. snippets of the sharedInstance method. So I made my own class using the trial and error method and et voila the following came out @implementation MySingleton MARK MARK Singleton Pattern using GCD id allocWithZone NSZone zone return self sharedInstance..
iOS 5 does not allow to store downloaded data in Documents directory? http://stackoverflow.com/questions/8209406/ios-5-does-not-allow-to-store-downloaded-data-in-documents-directory 5 does not allow to store downloaded data in Documents directory I have made an application for my client by keeping target iOS as 4. But.. files in the Cache directory then they won't be backed up and Apple won't reject your app. However when iOS 5 gets low on space it may delete all the files in there. However with iOS 5.0.1 there is a third option Put files in Documents but..
http://stackoverflow.com/questions/983657/iphone-device-debugging all of the suggestions mentioned here. EDIT 4 FINALLY got device debugging to work. I have a feeling that something low level on my device was causing issues...nothing I did worked on my system. However I installed Xcode on another system and..
Why is my CLLocation speed so inaccurate? http://stackoverflow.com/questions/1180050/why-is-my-cllocation-speed-so-inaccurate like running or biking. The Best I´ve seen is RunKeeper. But in my Application the Speed is absolutely inaccurate. In Low Speeds is always null and only at higher speeds it shows some values but they are rarely updated and noot really usefull...
Finding Distance from RSSI value of bluetooth low energy enable device http://stackoverflow.com/questions/13705647/finding-distance-from-rssi-value-of-bluetooth-low-energy-enable-device RSSI value Are there any available formulas I am getting the RSSI value of the device with the help of this bluetooth Low energy delegate method void centralManager CBCentralManager central didDiscoverPeripheral CBPeripheral peripheral advertisementData..
how some apps can open setting app programmatically within their app http://stackoverflow.com/questions/14587370/how-some-apps-can-open-setting-app-programmatically-within-their-app screen. The reason that apps like MapMyFitness open preferences is because they ask for permission to use Bluetooth Low Energy. Asking for permission is managed by CBCentralManager on first usage. This is also the class that knows if Bluetooth..
Video file formats supported in iPhone http://stackoverflow.com/questions/1535836/video-file-formats-supported-in-iphone and using the following compression standards H.264 video up to 1.5 Mbps 640 by 480 pixels 30 frames per second Low Complexity version of the H.264 Baseline Profile with AAC LC audio up to 160 Kbps 48kHz stereo audio in .m4v .mp4 and .mov..
Supported Audio file formats in iPhone http://stackoverflow.com/questions/1761460/supported-audio-file-formats-in-iphone iPhone OS are the following AAC HE AAC AMR Adaptive Multi Rate a format for speech ALAC Apple Lossless iLBC internet Low Bitrate Codec another format for speech IMA4 IMA ADPCM linear PCM uncompressed µ law and a law MP3 MPEG 1 audio layer 3..
How can I record AMR audio format on the iPhone? http://stackoverflow.com/questions/276644/how-can-i-record-amr-audio-format-on-the-iphone Official api says that supported encoding formats are ALAC Apple Lossless ~ kAudioFormatAppleLossless iLBC internet Low Bitrate Codec for speech ~ kAudioFormatiLBC IMA ADPCM IMA4 ~ kAudioFormatAppleIMA4 linear PCM ~ kAudioFormatLinearPCM µ..
Low memory with 640Kb of live bytes? http://stackoverflow.com/questions/2865786/low-memory-with-640kb-of-live-bytes memory with 640Kb of live bytes i've a problem with my application that need to display a lot of images and video. After..
Memory Troubles with UIImagePicker http://stackoverflow.com/questions/2921560/memory-troubles-with-uiimagepicker view if it doesn't have a superview. super didReceiveMemoryWarning UIAlertView alert UIAlertView alloc initWithTitle @ Low Memory Warning message @ Cleaning out events data delegate nil cancelButtonTitle @ All right then. otherButtonTitles..
Looking for a graph layout framework for iOS [closed] http://stackoverflow.com/questions/3692840/looking-for-a-graph-layout-framework-for-ios ios graph layout share improve this question According to a post on the graphviz development mailing list Glen Low of pixelglow has already managed to port graphviz and uses it in Instaviz . He also has some hints on the configure script...
Out-Of-Memory while doing Core Data migration http://stackoverflow.com/questions/4479229/out-of-memory-while-doing-core-data-migration performance. My issue is that during the migration it seems that Core Data loads everything into memory which leads to Low Memory Warnings and then to my app being killed. Apple documentation suggests the following http developer.apple.com library..
iPhone Development - Memory limitation for iphone application http://stackoverflow.com/questions/457568/iphone-development-memory-limitation-for-iphone-application
How to get the status of bluetooth (ON/OFF) in iphone programatically http://stackoverflow.com/questions/4955007/how-to-get-the-status-of-bluetooth-on-off-in-iphone-programatically lost update imminent. break case CBCentralManagerStateUnsupported stateString @ The platform doesn't support Bluetooth Low Energy. break case CBCentralManagerStateUnauthorized stateString @ The app is not authorized to use Bluetooth Low Energy... Low Energy. break case CBCentralManagerStateUnauthorized stateString @ The app is not authorized to use Bluetooth Low Energy. break case CBCentralManagerStatePoweredOff stateString @ Bluetooth is currently powered off. break case CBCentralManagerStatePoweredOn..
AVAssetWritter does not work with audio http://stackoverflow.com/questions/5200077/avassetwritter-does-not-work-with-audio sorts out the session configuration otherwise the torch goes off etc session beginConfiguration switch quality case Low session.sessionPreset AVCaptureSessionPresetLow break case Medium session.sessionPreset AVCaptureSessionPreset640x480 break.. the torch goes off etc session beginConfiguration switch quality case Low session.sessionPreset AVCaptureSessionPresetLow break case Medium session.sessionPreset AVCaptureSessionPreset640x480 break session commitConfiguration camera lockForConfiguration..
iOS Low Memory Crash, but very low memory usage http://stackoverflow.com/questions/5980636/ios-low-memory-crash-but-very-low-memory-usage Low Memory Crash but very low memory usage This has been annoying me for a long time. My app runs taking up about 2.74MB of.. Could not get mobile equipment info dictionary ReportCrash 1206 Error Saved crashreport to Library Logs CrashReporter LowMemory 2011 05 12 160645.plist using uid 0 gid 0 synthetic_euid 0 egid 0 I have removed all calls to imageNamed changed autoreleased..
Accelerometer Low Pass Filtering http://stackoverflow.com/questions/6942626/accelerometer-low-pass-filtering Low Pass Filtering Still on the BigNerdRanch iOS Development book. In the Accelerometer chapter they first implement accelerometer..
Low quality of capture view context on iPad http://stackoverflow.com/questions/8891772/low-quality-of-capture-view-context-on-ipad quality of capture view context on iPad I need capture specific UIView but the result is in low quality how can fix this..
Maintain PHP Session in web app on iPhone http://stackoverflow.com/questions/9998900/maintain-php-session-in-web-app-on-iphone
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