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2014/10/15 ¤U¤È 10:03:30
iphone Programming Glossary: additionalWhen should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc through IBOutlets when loading from a nib or programmatically inside loadView for instance. The additional ownership of subviews by the UIViewController means that even when its view is removed from the view.. own outstanding retaining references to those objects as well. Releasing the UIViewController's additional ownership of these objects ensures they will be deallocated as well to free memory. The objects that..
Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar http://stackoverflow.com/questions/227078/creating-a-left-arrow-button-like-uinavigationbars-back-style-on-a-uitoolba code did the trick requires custom image in bundle should be combined with this answer. So here is additional code Creates a back button instead of default behaviour displaying title of previous screen UIBarButtonItem..
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self aController just changes the mainViewController instance variable directly skipping over any additional code that might be built into UIApplication's setMainViewController method such as releasing old objects..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library C class or category. While this option will typically result in a larger executable due to additional object code loaded into the application it will allow the successful creation of effective Objective..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file to create a PDF that works anywhere then you should take a closer look at this issue. Here's some additional info http www.iphonedevsdk.com forum iphone sdk development 15505 pdf font problem cant get cids glyphs.html#post97854..
Rendering to non-power-of-two texture on iPhone http://stackoverflow.com/questions/4760174/rendering-to-non-power-of-two-texture-on-iphone textures. The restrictions remain in place for cube map and 3D textures if supported. There is no additional procedural or enumerant API introduced by this extension except that an implementation which exports..
Xcode 4 failure to symbolicate Crash Log http://stackoverflow.com/questions/5458573/xcode-4-failure-to-symbolicate-crash-log Support iPhone Simulator file system for the iPhone Simulator Like this See this blog post for additional detail. Update from a comment by joerick This works but it also meant that Instruments.app couldn't..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature this question Instead of subclassing you could create an NSDateFormatter category with an additional initializer that takes care of assigning the locale and possibly also a format string so you'd have..
Detecting Color of iPhone/iPad/iPod touch? http://stackoverflow.com/questions/8463212/detecting-color-of-iphone-ipad-ipod-touch of now and personally I don't think it's worth much because what if the end user uses a skin or an additional casing for his iPhone I'd suggest to initially ask the user Hey what's the color of your phone and then..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically one is active. So in the implementation of myRootController I do this Implement viewDidLoad to do additional setup after loading the view typically from a nib. void viewDidLoad super viewDidLoad ViewControllerA..
When should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc in the view hierarchy. These properties could have been set through IBOutlets when loading from a nib or programmatically inside loadView for instance. The additional ownership of subviews by the UIViewController means that even when its view is removed from the view hierarchy and released to save memory through which the subviews.. because the UIViewController itself still contains its own outstanding retaining references to those objects as well. Releasing the UIViewController's additional ownership of these objects ensures they will be deallocated as well to free memory. The objects that you release here are usually recreated and set again when the..
Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar http://stackoverflow.com/questions/227078/creating-a-left-arrow-button-like-uinavigationbars-back-style-on-a-uitoolba PrairieHippo maralbjo found that using the following simple code did the trick requires custom image in bundle should be combined with this answer. So here is additional code Creates a back button instead of default behaviour displaying title of previous screen UIBarButtonItem backButton UIBarButtonItem alloc initWithImage UIImage..
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self aController On the other hand mainViewController aController just changes the mainViewController instance variable directly skipping over any additional code that might be built into UIApplication's setMainViewController method such as releasing old objects retaining new ones updating internal variables and so on...
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library to load every object file in the library that defines an Objective C class or category. While this option will typically result in a larger executable due to additional object code loaded into the application it will allow the successful creation of effective Objective C static libraries that contain categories on existing classes...
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file you should be fine using CoreGraphics . However if you need to create a PDF that works anywhere then you should take a closer look at this issue. Here's some additional info http www.iphonedevsdk.com forum iphone sdk development 15505 pdf font problem cant get cids glyphs.html#post97854 As a workaround I've used libHaru successfully..
Rendering to non-power-of-two texture on iPhone http://stackoverflow.com/questions/4760174/rendering-to-non-power-of-two-texture-on-iphone extension relaxes these size restrictions for 2D textures. The restrictions remain in place for cube map and 3D textures if supported. There is no additional procedural or enumerant API introduced by this extension except that an implementation which exports the extension string will allow an application to pass in 2D..
Xcode 4 failure to symbolicate Crash Log http://stackoverflow.com/questions/5458573/xcode-4-failure-to-symbolicate-crash-log Xcode DerivedData Xcode 4 build artefacts ~ Library Application Support iPhone Simulator file system for the iPhone Simulator Like this See this blog post for additional detail. Update from a comment by joerick This works but it also meant that Instruments.app couldn't find the debug symbols so I had to remove DerivedData from the..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature answer below. iphone ios locale nsdateformatter share improve this question Instead of subclassing you could create an NSDateFormatter category with an additional initializer that takes care of assigning the locale and possibly also a format string so you'd have a ready to use formatter right after initializing it. @interface..
Detecting Color of iPhone/iPad/iPod touch? http://stackoverflow.com/questions/8463212/detecting-color-of-iphone-ipad-ipod-touch improve this question The answer to the question is NO as of now and personally I don't think it's worth much because what if the end user uses a skin or an additional casing for his iPhone I'd suggest to initially ask the user Hey what's the color of your phone and then do accordingly. Additionally a research provided me with..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically ViewControllerB has a black background. Just to see which one is active. So in the implementation of myRootController I do this Implement viewDidLoad to do additional setup after loading the view typically from a nib. void viewDidLoad super viewDidLoad ViewControllerA vcA ViewControllerA alloc initWithNib self.contentView addSubview..
Iphone - How to encrypt NSData with public key and decrypt with private key? http://stackoverflow.com/questions/10072124/iphone-how-to-encrypt-nsdata-with-public-key-and-decrypt-with-private-key privateKey return privateKeyReference #pragma mark View lifecycle void viewDidLoad super viewDidLoad Do any additional setup after loading the view typically from a nib. void viewDidUnload super viewDidUnload Release any retained subviews..
RSA implementations in Objective C http://stackoverflow.com/questions/10222524/rsa-implementations-in-objective-c privateKey return privateKeyReference #pragma mark View lifecycle void viewDidLoad super viewDidLoad Do any additional setup after loading the view typically from a nib. void viewDidUnload super viewDidUnload Release any retained subviews..
When should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc could have been set through IBOutlets when loading from a nib or programmatically inside loadView for instance. The additional ownership of subviews by the UIViewController means that even when its view is removed from the view hierarchy and released.. still contains its own outstanding retaining references to those objects as well. Releasing the UIViewController's additional ownership of these objects ensures they will be deallocated as well to free memory. The objects that you release here are..
What happens if I don't retain IBOutlet? http://stackoverflow.com/questions/1250518/what-happens-if-i-dont-retain-iboutlet the property will have retained it. The UITextField will also be a subview of the top level UIView so it will have an additional retain on it being in the subviews array of the top level view so at this point the text field has been retained twice... it when setting the instance variable. One interesting point this highlights is that because the UITextField is additionally retained through the property you'll likely not want to keep it around in case of a memory warning. For this reason you.. the scenario. Simply following the guidelines will help avoid problems as you encounter more complex situations. It is additionally worth noting that the memory management behavior differs on Mac OS X on the desktop. On the desktop setting an IBOutlet..
Creating a left-arrow button (like UINavigationBar's “back” style) on a UIToolbar http://stackoverflow.com/questions/227078/creating-a-left-arrow-button-like-uinavigationbars-back-style-on-a-uitoolba following simple code did the trick requires custom image in bundle should be combined with this answer. So here is additional code Creates a back button instead of default behaviour displaying title of previous screen UIBarButtonItem backButton UIBarButtonItem..
Objective-C - When to use 'self' http://stackoverflow.com/questions/2385980/objective-c-when-to-use-self hand mainViewController aController just changes the mainViewController instance variable directly skipping over any additional code that might be built into UIApplication's setMainViewController method such as releasing old objects retaining new ones..
Objective-C categories in static library http://stackoverflow.com/questions/2567498/objective-c-categories-in-static-library that defines an Objective C class or category. While this option will typically result in a larger executable due to additional object code loaded into the application it will allow the successful creation of effective Objective C static libraries..
http://stackoverflow.com/questions/2694411/text-inset-for-uitextfield override at least this method CGRect textRectForBounds CGRect bounds It might be as simple as this if you have no additional content return CGRectInset bounds 10 10 UITextField provides several positioning methods you can override. share improve..
ApplicationWillTerminate in iOS 4.0 http://stackoverflow.com/questions/3139588/applicationwillterminate-in-ios-4-0 the system does call the applicationWillTerminate method of the application delegate. Your application cannot request additional background execution time from this method. So yes applicationWillTerminate will generally not be called very often in iOS..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file However if you need to create a PDF that works anywhere then you should take a closer look at this issue. Here's some additional info http www.iphonedevsdk.com forum iphone sdk development 15505 pdf font problem cant get cids glyphs.html#post97854 As..
What is -[NSString sizeWithFont:forWidth:lineBreakMode:] good for? http://stackoverflow.com/questions/455553/what-is-nsstring-sizewithfontforwidthlinebreakmode-good-for documentation for NSString sizeWithFont forWidth lineBreakMode states explains it doesn't actually wrap the text to additional lines. So how would I use it Examples would help. iphone objective c cocoa touch share improve this question It works..
Rendering to non-power-of-two texture on iPhone http://stackoverflow.com/questions/4760174/rendering-to-non-power-of-two-texture-on-iphone restrictions for 2D textures. The restrictions remain in place for cube map and 3D textures if supported. There is no additional procedural or enumerant API introduced by this extension except that an implementation which exports the extension string..
Xcode 4 failure to symbolicate Crash Log http://stackoverflow.com/questions/5458573/xcode-4-failure-to-symbolicate-crash-log ~ Library Application Support iPhone Simulator file system for the iPhone Simulator Like this See this blog post for additional detail. Update from a comment by joerick This works but it also meant that Instruments.app couldn't find the debug symbols..
Programatically Dial a Phone number and pass DTMF using the iPhone SDK http://stackoverflow.com/questions/584663/programatically-dial-a-phone-number-and-pass-dtmf-using-the-iphone-sdk Dial a Phone Number through the iPhone SDK 2 Bypass the dial cancel prompt that the iPhone brings up 3 Send additional DTMF after the number is dialed just like how you would program pauses into a regular phone. I know you can make a tel call..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature share improve this question Instead of subclassing you could create an NSDateFormatter category with an additional initializer that takes care of assigning the locale and possibly also a format string so you'd have a ready to use formatter..
http://stackoverflow.com/questions/6851660/version-vs-build-in-xcode-4 in Xcode to read the Build number increment it and write it back to the app's App Info.plist file. There are optional additional steps if you want to write your version build numbers to your Settings.bundle Root .plist file s . This is extended from..
Why is object not dealloc'ed when using ARC + NSZombieEnabled http://stackoverflow.com/questions/8408071/why-is-object-not-dealloced-when-using-arc-nszombieenabled to backtrace and both deallocs while zombies on yields no backtrace and only one dealloc. If you're interested the additional logging is contained in a fork of the sample project works by just running there are two shared schemes for zombies on off...
Detecting Color of iPhone/iPad/iPod touch? http://stackoverflow.com/questions/8463212/detecting-color-of-iphone-ipad-ipod-touch question is NO as of now and personally I don't think it's worth much because what if the end user uses a skin or an additional casing for his iPhone I'd suggest to initially ask the user Hey what's the color of your phone and then do accordingly...
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically Just to see which one is active. So in the implementation of myRootController I do this Implement viewDidLoad to do additional setup after loading the view typically from a nib. void viewDidLoad super viewDidLoad ViewControllerA vcA ViewControllerA..
UIBarButtonItem Custom Background Appearance 'Jumping' after flip transition http://stackoverflow.com/questions/15261148/uibarbuttonitem-custom-background-appearance-jumping-after-flip-transition nil Ignore the handler bit I'm using BlocksKit. You can see it happening here http screencast.com t HZRBS70OT6wt Additional Info It even does this when I put the button in place in storyboard's instead of code. Only seems to happen on the horizontal..
Custom UITableViewCell Not Using .xib (Most Likely Because of Flaw in init Method) http://stackoverflow.com/questions/15591364/custom-uitableviewcell-not-using-xib-most-likely-because-of-flaw-in-init-metho than the .xib and several setters and getters this is the only real part of my code that relates to retrieving a cell. Additional Information 1 This is my .xib which is linked to the class. 2 This is the code that calls creates the UITableView the delegate..
UITextField: move view when keyboard appears http://stackoverflow.com/questions/1775860/uitextfield-move-view-when-keyboard-appears context nil UIView setAnimationDuration animationDuration self.view.frame frame UIView commitAnimations Additional Code However this solution has a simple flaw When I finish editing one of the hidden textfields and touch another textfield..
Blank black screen when running my iPad App http://stackoverflow.com/questions/3216336/blank-black-screen-when-running-my-ipad-app table in it. Any help anyone can provide would really save me a lot of whining mopeyness and crying. heh Thanks. Additional Requested Code viewDidLoad from MasterView.m void viewDidLoad super viewDidLoad NSLog @ Master This self @ self self.contentSizeForViewInPopover..
Sqlite3_step() keeps returning SQLITE_MISUSE on this query. Any pointers? http://stackoverflow.com/questions/3651265/sqlite3-step-keeps-returning-sqlite-misuse-on-this-query-any-pointers failed call close to properly clean up resources. sqlite3_close database NSLog @ database opening failed d success Additional error handling as appropriate... if statement nil const char sql insert into name nid name values 6 'testname' success sqlite3_prepare_v2..
How to link to apps on the app store http://stackoverflow.com/questions/433907/how-to-link-to-apps-on-the-app-store send customers to a specific app with your company name included in the URL http itunes.com apps developername appname Additional notes You can replace http with itms or itms apps to avoid redirects. For info on naming see QA1633 https developer.apple.com..
PVR textures versus PNG in OpenGL ES http://stackoverflow.com/questions/501956/pvr-textures-versus-png-in-opengl-es proportional to image size. Can be further compressed by other methods. Size limitations. Powers of 2 square only. Additional conversion tool is required process can be automated but will slow down build times considerably. share improve this answer..
Using Phonegap for Native Application development [closed] http://stackoverflow.com/questions/5161004/using-phonegap-for-native-application-development background. LocalStorage GeoLocation etc.. works really well. I hope this helps a little... and feel to ask questions. Additional Edit I really think it comes down to what you want to do and what you know how to do. Matt pointed out that developing native..
how do I calculate heightForRowAtIndexPath when the cell is not even constructed yet? http://stackoverflow.com/questions/5294356/how-do-i-calculate-heightforrowatindexpath-when-the-cell-is-not-even-constructed delegate for every height but only ask for visible cells OR selectively reload the rows where the size has changed. Additional material If I understand the follow up question in the comment the following may help If you are implementing an editing..
iPhone FFT with Accelerate framework vDSP http://stackoverflow.com/questions/6358764/iphone-fft-with-accelerate-framework-vdsp i Fs N . Conversely if you are interested in a specific frequency f then the bin of interest i is given by i N f Fs . Additional note you will need to apply a suitable window function e.g. Hann aka Hanning to your FFT input data prior to calculating..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown returning a non object including void you could end up with a garbage pointer value being retained released and crash. Additional Arguments One consideration is that this is the same warning will occur with performSelector withObject and you could run..
Need some help understanding transient properties in Core Data http://stackoverflow.com/questions/7504391/need-some-help-understanding-transient-properties-in-core-data contents have changed. Anyway I don't use undo. So do I get any benefit if I declare grid to be a transient property Additional question. What if I have code like this Board board someOtherManagedObject.board NSObject boardContents board.grid objectAtIndex..
How to reload my UIViewController on click of some buttons? http://stackoverflow.com/questions/7725215/how-to-reload-my-uiviewcontroller-on-click-of-some-buttons custom drawing then it should cause your subviews to receive the same message so that they can get a chance to redraw. Additional information here. Specifically read the section labeled The View Drawing Cycle . http developer.apple.com library ios #documentation..
Crash when adding persistent store (iCloud enabled) in app delegate http://stackoverflow.com/questions/8021753/crash-when-adding-persistent-store-icloud-enabled-in-app-delegate URLForUbiquityContainerIdentifier nil ensuring that the container information is gathered from the entitlements file. Additional methods _notificationArray is defined as the following @property nonatomice strong NSMutableArray notificationArray @synthesize..
RestKit Object Mapping Relationships without KVC http://stackoverflow.com/questions/9318565/restkit-object-mapping-relationships-without-kvc the list of Contacts that belong to a company down in the payload instead. It may be more efficient for your use case. Additional details from my post to the RestKit mailing list http groups.google.com group restkit msg 416951f86b2862d1 share improve..
Additional Icon in App Name/Lable http://stackoverflow.com/questions/9891204/additional-icon-in-app-name-lable Icon in App Name Lable How can I add an additional icon to the Name Lable of app just the like snapshot of my test device..
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