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2014/10/15 ¤U¤È 10:08:31
iphone Programming Glossary: everDeclaration/definition of variables locations in ObjectiveC? http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec 1 What do I declare here @interface SampleClass NSObject 2 ivar declarations Pretty much never used 3 class specific method property declarations @end and #import SampleClass.h 4 what goes here @interface.. is that those are C style file based declarations and definitions that have no understanding whatsoever of the concept of class and thus have to be used exactly how they would be used in C. I've seen them.. the @synthesize directive and thus can be mostly ignored. Is that the case Regarding 5 why would I ever want to declare methods in private interfaces My private class methods seem to compile just fine without..
How to add more details in MKAnnotation in iOS http://stackoverflow.com/questions/2342070/how-to-add-more-details-in-mkannotation-in-ios setCanShowCallout YES return annotationView And that will display your custom view where ever you have an annotation... if you want a step by step tutorial check out this video . hope this helps..
iPhone: Detecting user inactivity/idle time since last screen touch http://stackoverflow.com/questions/273450/iphone-detecting-user-inactivity-idle-time-since-last-screen-touch of timer resets. NSSet allTouches event allTouches if allTouches count 0 allTouches count only ever seems to be 1 so anyObject works here. UITouchPhase phase UITouch allTouches anyObject .phase if phase..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 theoretically build a single static library that includes both simulator and iPhone and iPad. However Apple has no documentation on this that I can find and Xcode's default templates are NOT configured.. this script with a project embedded in another project although I highly recommend NOT doing that ever Apple has a couple of show stopper bugs in Xcode if you embed projects inside each other from Xcode.. from the Project section to the Public section OPTIONAL ...and they will AUTOMATICALLY be exported every time you build the app into a sub directory of the debug universal directory they will be in usr local..
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 the run loop to come to completion in the middle of operations performed on the main thread. However this still may reduce the responsiveness of your application. In general it is recommended that you.. a while to perform to a background thread so that the user interface can remain responsive. However any updates you wish to perform to the UI need to be done back on the main thread. Perhaps the easiest.. continuous progress tracking in your UI you could place the dispatch to the main queue where ever you needed a UI update to be performed. For older OS versions you can break off a background thread..
Create singleton using GCD's dispatch_once in Objective C http://stackoverflow.com/questions/5720029/create-singleton-using-gcds-dispatch-once-in-objective-c to create an instance of your class. It may not technically be a singleton in that there can only ever be 1 of these objects but as long as you only use the Foo sharedFoo method to access the object this..
How to convert NSData to byte array in iPhone? http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone
Objective-C ARC: strong vs retain and weak vs assign http://stackoverflow.com/questions/8927727/objective-c-arc-strong-vs-retain-and-weak-vs-assign crash when I send a message to the pointer once it's been released. But if I use weak this won't ever happen because message send to nil won't do anything. I don't know about any differences between strong..
How to detect first time app launch on an iPhone http://stackoverflow.com/questions/9964371/how-to-detect-first-time-app-launch-on-an-iphone
Declaration/definition of variables locations in ObjectiveC? http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec Here's a sample class .h and .m #import Foundation Foundation.h 1 What do I declare here @interface SampleClass NSObject 2 ivar declarations Pretty much never used 3 class specific method property declarations @end and #import SampleClass.h 4 what goes here @interface SampleClass 5 private interface can define private.. and private interfaces @end My understanding of 1 and 4 is that those are C style file based declarations and definitions that have no understanding whatsoever of the concept of class and thus have to be used exactly how they would be used in C. I've seen them used for implementing static variable based singletons before... that ivars have been alost completely phased out outside of the @synthesize directive and thus can be mostly ignored. Is that the case Regarding 5 why would I ever want to declare methods in private interfaces My private class methods seem to compile just fine without a declaration in the interface. Is it mostly for readability..
How to add more details in MKAnnotation in iOS http://stackoverflow.com/questions/2342070/how-to-add-more-details-in-mkannotation-in-ios newAnnotationView annotationView setEnabled YES annotationView setCanShowCallout YES return annotationView And that will display your custom view where ever you have an annotation... if you want a step by step tutorial check out this video . hope this helps EDIT I actually just found a new Maps example on the apple..
iPhone: Detecting user inactivity/idle time since last screen touch http://stackoverflow.com/questions/273450/iphone-detecting-user-inactivity-idle-time-since-last-screen-touch timer on a Began touch or an Ended touch to reduce the number of timer resets. NSSet allTouches event allTouches if allTouches count 0 allTouches count only ever seems to be 1 so anyObject works here. UITouchPhase phase UITouch allTouches anyObject .phase if phase UITouchPhaseBegan phase UITouchPhaseEnded self resetIdleTimer..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 simulator using Xcode and SDK 4 It appears that we can theoretically build a single static library that includes both simulator and iPhone and iPad. However Apple has no documentation on this that I can find and Xcode's default templates are NOT configured to do this. I'm looking for a simple portable re usable technique.. library into a Framework . RECENT CHANGES Info on how to use this script with a project embedded in another project although I highly recommend NOT doing that ever Apple has a couple of show stopper bugs in Xcode if you embed projects inside each other from Xcode 3.x through to Xcode 4.6.x Bonus script to let you auto include.. to the Copy Headers phase OPTIONAL ...and drag drop them from the Project section to the Public section OPTIONAL ...and they will AUTOMATICALLY be exported every time you build the app into a sub directory of the debug universal directory they will be in usr local include OPTIONAL NOTE if you also try to drag drop your..
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 is not entirely correct as Tom's answer shows. You can allow the run loop to come to completion in the middle of operations performed on the main thread. However this still may reduce the responsiveness of your application. In general it is recommended that you move anything that takes a while to perform to a background.. In general it is recommended that you move anything that takes a while to perform to a background thread so that the user interface can remain responsive. However any updates you wish to perform to the UI need to be done back on the main thread. Perhaps the easiest way to do this under Snow Leopard and iOS 4.0 is to use blocks.. UI is only updated at the end of the operation but if you wanted continuous progress tracking in your UI you could place the dispatch to the main queue where ever you needed a UI update to be performed. For older OS versions you can break off a background thread manually or through an NSOperation. For manual background threading..
Create singleton using GCD's dispatch_once in Objective C http://stackoverflow.com/questions/5720029/create-singleton-using-gcds-dispatch-once-in-objective-c
How to convert NSData to byte array in iPhone? http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone
Objective-C ARC: strong vs retain and weak vs assign http://stackoverflow.com/questions/8927727/objective-c-arc-strong-vs-retain-and-weak-vs-assign the pointer while assign won't which means the program will crash when I send a message to the pointer once it's been released. But if I use weak this won't ever happen because message send to nil won't do anything. I don't know about any differences between strong and retain . Is there any reason why should I use assign..
How to detect first time app launch on an iPhone http://stackoverflow.com/questions/9964371/how-to-detect-first-time-app-launch-on-an-iphone
How 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 iphone objective c ios share improve this question Looked into it and it doesnt link against IOSurface. I did however find that it uses dlsym and after some more reverse engineering I found this System Library Frameworks IOKit.framework IOKit.. Looked into it and it doesnt link against IOSurface. I did however find that it uses dlsym and after some more reverse engineering I found this System Library Frameworks IOKit.framework IOKit IOServiceGetMatchingServices IOServiceGetMatchingService.. 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 are still many more tricks developers could potentially use to hide..
Declaration/definition of variables locations in ObjectiveC? http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec Foundation Foundation.h 1 What do I declare here @interface SampleClass NSObject 2 ivar declarations Pretty much never used 3 class specific method property declarations @end and #import SampleClass.h 4 what goes here @interface SampleClass.. of 1 and 4 is that those are C style file based declarations and definitions that have no understanding whatsoever of the concept of class and thus have to be used exactly how they would be used in C. I've seen them used for implementing.. out outside of the @synthesize directive and thus can be mostly ignored. Is that the case Regarding 5 why would I ever want to declare methods in private interfaces My private class methods seem to compile just fine without a declaration in..
Break on EXC_BAD_ACCESS in XCode? http://stackoverflow.com/questions/1622079/break-on-exc-bad-access-in-xcode to send a message to a released object. The BEST way to track these down is use NSZombieEnabled . This works by never actually releasing an object but by wrapping it up as a zombie and setting a flag inside it that says it normally would.. helps in background threads when the Debugger sometimes craps out on any useful information. VERY IMPORTANT TO NOTE however is that you need to 100 make sure this is only in your debug code and not your distribution code. Because nothing is ever.. is that you need to 100 make sure this is only in your debug code and not your distribution code. Because nothing is ever released your app will leak and leak and leak. To remind me to do this I put this log in my appdelegate if getenv NSZombieEnabled..
@property and retain, assign, copy, nonatomic in Objective-C http://stackoverflow.com/questions/2255861/property-and-retain-assign-copy-nonatomic-in-objective-c a setter will be created for you. If you use readonly no setter will be created. Use it for a value you don't want to ever change after the instantiation of the object. retain vs. copy vs. assign assign is the default. In the setter that is created..
How to add more details in MKAnnotation in iOS http://stackoverflow.com/questions/2342070/how-to-add-more-details-in-mkannotation-in-ios setEnabled YES annotationView setCanShowCallout YES return annotationView And that will display your custom view where ever you have an annotation... if you want a step by step tutorial check out this video . hope this helps EDIT I actually just..
iPhone: Detecting user inactivity/idle time since last screen touch http://stackoverflow.com/questions/273450/iphone-detecting-user-inactivity-idle-time-since-last-screen-touch to reduce the number of timer resets. NSSet allTouches event allTouches if allTouches count 0 allTouches count only ever seems to be 1 so anyObject works here. UITouchPhase phase UITouch allTouches anyObject .phase if phase UITouchPhaseBegan..
Practical rules for premature optimization [closed] http://stackoverflow.com/questions/2978460/practical-rules-for-premature-optimization doesn't matter instead of the 10 that does. No one cares if some code takes 10ms instead of 1ms if that code is hardly ever called. There are times when just doing something simple that works and moving on is a good choice even though you know..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 appears that we can theoretically build a single static library that includes both simulator and iPhone and iPad. However Apple has no documentation on this that I can find and Xcode's default templates are NOT configured to do this. I'm looking.. Info on how to use this script with a project embedded in another project although I highly recommend NOT doing that ever Apple has a couple of show stopper bugs in Xcode if you embed projects inside each other from Xcode 3.x through to Xcode.. drag drop them from the Project section to the Public section OPTIONAL ...and they will AUTOMATICALLY be exported every time you build the app into a sub directory of the debug universal directory they will be in usr local include OPTIONAL..
Getting displacement from accelerometer data with Core Motion http://stackoverflow.com/questions/4449565/getting-displacement-from-accelerometer-data-with-core-motion twice to get velocity from acceleration and then position from velocity. But there is no example in code whatsoever and I don't think that is really necessary. Also there is the problem that when the iPhone is still on a plane accelerometer.. integration's result 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.. approach is to introduce something I call synthectic forces or virtual forces . This is some strategy to react on several bad situations triggering the object to drift away although the device remains fixed no native speaker I mean without..
What is -[NSString sizeWithFont:forWidth:lineBreakMode:] good for? http://stackoverflow.com/questions/455553/what-is-nsstring-sizewithfontforwidthlinebreakmode-good-for it out and returns how big of an area it would need to really lay it out. its the responsibility of the label or what ever container you are using for the text to perform the wrapping what ever else that needs to be done. Hope that helps. chris...
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 shows. You can allow the run loop to come to completion in the middle of operations performed on the main thread. However this still may reduce the responsiveness of your application. In general it is recommended that you move anything that takes.. anything that takes a while to perform to a background thread so that the user interface can remain responsive. However any updates you wish to perform to the UI need to be done back on the main thread. Perhaps the easiest way to do this under.. but if you wanted continuous progress tracking in your UI you could place the dispatch to the main queue where ever you needed a UI update to be performed. For older OS versions you can break off a background thread manually or through..
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 You won't have any issues with concurrency if you do your swizzling here. If you were to swizzle in void initialize however you could end up with a race condition in your swizzling implementation and the runtime could end up in a weird state. Changes.. setFrame like it should be. It's now my_setFrame . The original implementation is being called with an argument it never expected it would receive. This is no good. There's a simple solution &mdash use the alternative swizzling technique defined.. debug One of the confusions during debugging is seeing a strange backtrace where the swizzled names are mixed up and everything gets jumbled in your head. Again the alternative implementation addresses this. You'll see clearly named functions..
Create singleton using GCD's dispatch_once in Objective C http://stackoverflow.com/questions/5720029/create-singleton-using-gcds-dispatch-once-in-objective-c and thread safe way to create an instance of your class. It may not technically be a singleton in that there can only ever be 1 of these objects but as long as you only use the Foo sharedFoo method to access the object this is good enough. share..
How to convert NSData to byte array in iPhone? http://stackoverflow.com/questions/724086/how-to-convert-nsdata-to-byte-array-in-iphone
What does the Xcode 4.2 preference “Support Wirelessly Connected Devices” do? http://stackoverflow.com/questions/7266391/what-does-the-xcode-4-2-preference-support-wirelessly-connected-devices-do 4.4 . 2 2012 This feature is still gone as of Xcode 4.6. There is currently no sign of it returning in near future if ever. 10 2013 Xcode 5.0 is here and there is still no sign the feature will return. We can pretty much assume it's dead for the..
Objective-C ARC: strong vs retain and weak vs assign http://stackoverflow.com/questions/8927727/objective-c-arc-strong-vs-retain-and-weak-vs-assign the program will crash when I send a message to the pointer once it's been released. But if I use weak this won't ever happen because message send to nil won't do anything. I don't know about any differences between strong and retain . Is..
Secure https encryption for iPhone app to webpage http://stackoverflow.com/questions/9181186/secure-https-encryption-for-iphone-app-to-webpage If you have a web service that uses a shared credential one bundled in the application then it will be possible to reverse engineer that credential. Ultimately it is impossible to ensure that a client running on another machine is your client... vigilance watching for new attacks and responding with fixes that patch them. The latter is very expensive and never ends. Make sure it's worth it. Some other useful discussions Anti piracy and app identification. iPhone SDK Easiest way.. to implement a challenge response system where the server authenticates that the client has the shared secret without ever putting it on the wire. The Wikipedia article on Challenge resonse authentication includes a good explanation of the algorithm...
How to detect first time app launch on an iPhone http://stackoverflow.com/questions/9964371/how-to-detect-first-time-app-launch-on-an-iphone
Declaration/definition of variables locations in ObjectiveC? http://stackoverflow.com/questions/12632285/declaration-definition-of-variables-locations-in-objectivec definition of variables locations in ObjectiveC Ever since starting to work on iOS apps and objective C I've been really puzzled by the different locations where one could be..
Xcode 5 shows the same device twice http://stackoverflow.com/questions/19054395/xcode-5-shows-the-same-device-twice 5 shows the same device twice Ever since my team switched from Xcode 4 to 5 this weird bug shows up that When we connect the iPhone iPod touch to the macs..
Playing videos in UIWebView broken in iOS4? http://stackoverflow.com/questions/3000021/playing-videos-in-uiwebview-broken-in-ios4 since version 2.0 of the SDK where I create and add a UIWebView and then load the URL of an .mov to play a movie. Ever since the early version of the 4.0 beta up until the 4.0 GM this has stopped working. When I load a movie now I get the..
Sorting an NSArray like the MPMediaPickerController/iPod Library http://stackoverflow.com/questions/4707892/sorting-an-nsarray-like-the-mpmediapickercontroller-ipod-library Here's an example of how the song names need to be sorted Awesome Song Title Cool Song The Darkest Song Ever My Song Title A Really Cool Song Why Me 4 Hours Wasted As you can see the sorting excludes the leading articles in the song..
css styling for input buttons on ipad / iphone http://stackoverflow.com/questions/5449412/css-styling-for-input-buttons-on-ipad-iphone
What are your favourite UITableView / UITableViewCell tricks? [closed] http://stackoverflow.com/questions/843427/what-are-your-favourite-uitableview-uitableviewcell-tricks the ones I found on Stack Overflow and the ones from my bookmarks. iphone cocoa touch share improve this question Ever wondered what UITableViewController really does In viewWillAppear it deselects any selected rows with animated YES . This..
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