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2014/10/15 ¤U¤È 10:16:05
iphone Programming Glossary: you'reHow to add a breakpoint to objc_exception_throw? http://stackoverflow.com/questions/1163981/how-to-add-a-breakpoint-to-objc-exception-throw share improve this question I think Brad's answer is pretty clear hopefully this can help if you're not finding it clear. In XCode from the top menu click on Run Show Breakpoints. A new window pops up...
http://stackoverflow.com/questions/1388467/reading-epub-format it somewhere to parse the manifest and then to display the relevant content. Some pointers if you're just starting out parse xml unzip To display content just use a UIWebView for now. Here's a high level..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone this question Since you haven't posted any code it's difficult to know exactly which problems you're encountering. However the blog post you link to does seem to work pretty decently... aside from the..
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring value UIColor blueColor range NSMakeRange 11 5 typed in a browser. caveat implementor Obviously you're not going to hard code in the ranges like this. Perhaps instead you could do something like NSDictionary..
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 your Target and in the Run Script Phase you MUST untick Show environment variables in build log if you're using a custom build output directory for XCode4 then XCode puts all your unexpected files in the wrong..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c objects still have to send messages to themselves to access properties it's hard to confuse when you're accessing a property or when you're accessing its backing ivar directly though using the 2.0 dot access.. to themselves to access properties it's hard to confuse when you're accessing a property or when you're accessing its backing ivar directly though using the 2.0 dot access to properties does make it more..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c special process for creating them you simply define a class that implements the delegate methods you're interested in. Though with delegates that use a formal protocol you must declare your delegate to implement..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c to hang onto that string you'd need to call retain explicitly and then explicitly release it when you're done. Consider the following very contrived bit of code and you'll see a situation where autorelease.. Aaron Hillegas a very well written book with lots of great examples. It reads like a tutorial. If you're truly diving in you could head to Big Nerd Ranch . This is a training facility run by Aaron Hillegas..
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 conflicts just in case Apple decides to add such a method in a future version of the OS. In case you're always using the same date format s you could also add category methods that return singleton instances..
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 _controller methodForSelector selector _controller selector Explanation What's going on here is you're asking the controller for the C function pointer for the method corresponding to the controller. All.. in the third line the void on the right hand side simply tells the compiler that you know what you're doing and not to generate a warning since the pointer types don't match . Finally you call the function.. this warning is that with ARC the runtime needs to know what to do with the result of the method you're calling. The result could be anything void int char NSString id etc. ARC normally gets this information..
How to add a breakpoint to objc_exception_throw? http://stackoverflow.com/questions/1163981/how-to-add-a-breakpoint-to-objc-exception-throw mentioned objective c iphone xcode debugging memory leaks share improve this question I think Brad's answer is pretty clear hopefully this can help if you're not finding it clear. In XCode from the top menu click on Run Show Breakpoints. A new window pops up. Select global breakpoints in the left hand menu. There should..
http://stackoverflow.com/questions/1388467/reading-epub-format You'll need to work out how to download the EPUB to unzip it somewhere to parse the manifest and then to display the relevant content. Some pointers if you're just starting out parse xml unzip To display content just use a UIWebView for now. Here's a high level step by step for your code 1 create a view with a UIWebView..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone iphone objective c encryption nsstring aes share improve this question Since you haven't posted any code it's difficult to know exactly which problems you're encountering. However the blog post you link to does seem to work pretty decently... aside from the extra comma in each call to CCCrypt which caused compile errors...
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring 5 6 string addAttribute NSForegroundColorAttributeName value UIColor blueColor range NSMakeRange 11 5 typed in a browser. caveat implementor Obviously you're not going to hard code in the ranges like this. Perhaps instead you could do something like NSDictionary wordToColorMapping .... an NSDictionary of NSString UIColor..
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 Apple deletes all output after 200 lines. Select your Target and in the Run Script Phase you MUST untick Show environment variables in build log if you're using a custom build output directory for XCode4 then XCode puts all your unexpected files in the wrong place. Build the project Click on the last icon on the right..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c the pattern they expect you to follow. No matter what since objects still have to send messages to themselves to access properties it's hard to confuse when you're accessing a property or when you're accessing its backing ivar directly though using the 2.0 dot access to properties does make it more possible. Using the standard.. No matter what since objects still have to send messages to themselves to access properties it's hard to confuse when you're accessing a property or when you're accessing its backing ivar directly though using the 2.0 dot access to properties does make it more possible. Using the standard message passing syntax makes intent..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c that has been assigned as a delegate of another. There's no special process for creating them you simply define a class that implements the delegate methods you're interested in. Though with delegates that use a formal protocol you must declare your delegate to implement that protocol see below. For example suppose you have..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c s NSString stringWithString @ Hello World If you want to hang onto that string you'd need to call retain explicitly and then explicitly release it when you're done. Consider the following very contrived bit of code and you'll see a situation where autorelease is required NSString createHelloWorldString NSString s NSString.. management. Cocoa Programming for Mac OS X 4th Edition by Aaron Hillegas a very well written book with lots of great examples. It reads like a tutorial. If you're truly diving in you could head to Big Nerd Ranch . This is a training facility run by Aaron Hillegas the author of the book mentioned above. I attended the Intro..
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 want to prefix your category method somehow to avoid name conflicts just in case Apple decides to add such a method in a future version of the OS. In case you're always using the same date format s you could also add category methods that return singleton instances with certain configurations something like sharedRFC3339DateFormatter..
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 SEL selector NSSelectorFromString @ someMethod void id SEL _controller methodForSelector selector _controller selector Explanation What's going on here is you're asking the controller for the C function pointer for the method corresponding to the controller. All objects respond to methodForSelector and it works through some.. and _cmd of every Objective C method call . This is handled in the third line the void on the right hand side simply tells the compiler that you know what you're doing and not to generate a warning since the pointer types don't match . Finally you call the function pointer. Complex Example When the selector takes arguments.. someRect someView Reasoning for Warning The reason for this warning is that with ARC the runtime needs to know what to do with the result of the method you're calling. The result could be anything void int char NSString id etc. ARC normally gets this information from the header of the object type you're working with...
How to add a breakpoint to objc_exception_throw? http://stackoverflow.com/questions/1163981/how-to-add-a-breakpoint-to-objc-exception-throw memory leaks share improve this question I think Brad's answer is pretty clear hopefully this can help if you're not finding it clear. In XCode from the top menu click on Run Show Breakpoints. A new window pops up. Select global breakpoints..
http://stackoverflow.com/questions/1388467/reading-epub-format the EPUB to unzip it somewhere to parse the manifest and then to display the relevant content. Some pointers if you're just starting out parse xml unzip To display content just use a UIWebView for now. Here's a high level step by step for..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone aes share improve this question Since you haven't posted any code it's difficult to know exactly which problems you're encountering. However the blog post you link to does seem to work pretty decently... aside from the extra comma in each..
How do you use NSAttributedString? http://stackoverflow.com/questions/3482346/how-do-you-use-nsattributedstring value UIColor blueColor range NSMakeRange 11 5 typed in a browser. caveat implementor Obviously you're not going to hard code in the ranges like this. Perhaps instead you could do something like NSDictionary wordToColorMapping..
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-4 200 lines. Select your Target and in the Run Script Phase you MUST untick Show environment variables in build log if you're using a custom build output directory for XCode4 then XCode puts all your unexpected files in the wrong place. Build the..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c No matter what since objects still have to send messages to themselves to access properties it's hard to confuse when you're accessing a property or when you're accessing its backing ivar directly though using the 2.0 dot access to properties does.. have to send messages to themselves to access properties it's hard to confuse when you're accessing a property or when you're accessing its backing ivar directly though using the 2.0 dot access to properties does make it more possible. Using the..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c another. There's no special process for creating them you simply define a class that implements the delegate methods you're interested in. Though with delegates that use a formal protocol you must declare your delegate to implement that protocol..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c World If you want to hang onto that string you'd need to call retain explicitly and then explicitly release it when you're done. Consider the following very contrived bit of code and you'll see a situation where autorelease is required NSString.. OS X 4th Edition by Aaron Hillegas a very well written book with lots of great examples. It reads like a tutorial. If you're truly diving in you could head to Big Nerd Ranch . This is a training facility run by Aaron Hillegas the author of the book..
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 somehow to avoid name conflicts just in case Apple decides to add such a method in a future version of the OS. In case you're always using the same date format s you could also add category methods that return singleton instances with certain configurations..
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 someMethod void id SEL _controller methodForSelector selector _controller selector Explanation What's going on here is you're asking the controller for the C function pointer for the method corresponding to the controller. All objects respond to.. call . This is handled in the third line the void on the right hand side simply tells the compiler that you know what you're doing and not to generate a warning since the pointer types don't match . Finally you call the function pointer. Complex.. The reason for this warning is that with ARC the runtime needs to know what to do with the result of the method you're calling. The result could be anything void int char NSString id etc. ARC normally gets this information from the header..
UIButton in UITableView cell like “Delete Event” http://stackoverflow.com/questions/1076785/uibutton-in-uitableview-cell-like-delete-event be handed back the cached cell that you will have already set up so all you have to do is change the labels or icons. You're going to want to move all that button allocation stuff up inside the if conditional right after the cell allocation code...
iphone sdk - Remove all characters except for numbers 0-9 from a string http://stackoverflow.com/questions/1160403/iphone-sdk-remove-all-characters-except-for-numbers-0-9-from-a-string phoneURL if there are any obvious typos they're just typos. iphone nsstring share improve this question You're using a trim method which means that it's only looking at the outer edges of the string. You're probably getting something.. this question You're using a trim method which means that it's only looking at the outer edges of the string. You're probably getting something like 555 555 555 as the phone number correct I'm not aware of an NS Mutable String method along..
Assertion failure in dequeueReusableCellWithIdentifier:forIndexPath: http://stackoverflow.com/questions/12737860/assertion-failure-in-dequeuereusablecellwithidentifierforindexpath argc argv nil NSStringFromClass AppDelegate class please help iphone ios share improve this question You're using the dequeueReusableCellWithIdentifier forIndexPath method. The documentation for that method says this Important You..
How to add a contact to the iPhone's Address Book from a Web Page? http://stackoverflow.com/questions/1773876/how-to-add-a-contact-to-the-iphones-address-book-from-a-web-page method because you get a nice timestamped calendar event showing the time and date of the download. 4 That's it You're all set now browse to the web page on your iphone and click the link to execute vcal.php . Your browser should now show..
iPhone: how to get safari to recognize a vcard? http://stackoverflow.com/questions/1892373/iphone-how-to-get-safari-to-recognize-a-vcard method because you get a nice timestamped calendar event showing the time and date of the download. 4 That's it You're all set now browse to the web page on your iphone and click the link to execute vcal.php . Your browser should now show..
Key Value Observing with an NSArray http://stackoverflow.com/questions/3478451/key-value-observing-with-an-nsarray context directly on an NSArray . In your case you want to call it on your GameModel with @ playerNameArray as the key. You're not done yet though. The normal automatic KVO notifications will only kick in if you call setPlayerNameArray thereby replacing..
problem with “this class is not key value coding-compliant” http://stackoverflow.com/questions/3760803/problem-with-this-class-is-not-key-value-coding-compliant let you decide which is the most appropriate. The reason it's failing is because the owner is being passed as nil. You're binding the actionText outlet to the file's owner in IB but then when loading the nib the owner is nil. I'd guess that when..
Moving the cursor to the beginning of UITextField http://stackoverflow.com/questions/4180263/moving-the-cursor-to-the-beginning-of-uitextfield at the end of the string. I'd like to move it to the beginning. iphone uitextfield share improve this question You're fighting the system on this one. UITextField does not have any public properties to set the cursor position which actually..
setKeepAliveTimeout and BackgroundTasks http://stackoverflow.com/questions/4777499/setkeepalivetimeout-and-backgroundtasks When you call setKeepAliveTimeout handler you only get a maximum of 30 seconds to complete everything and suspend. You're not given the same background grace period as you'd be given when your application is first transitioned to the background...
Extract iPod Library raw PCM samples and play with sound effects http://stackoverflow.com/questions/4796643/extract-ipod-library-raw-pcm-samples-and-play-with-sound-effects AVAssetReaderStatusUnknown Something went wrong. Handle it. if reader.status AVAssetReaderStatusCompleted You're done. It worked. reader release return fullSongData autorelease I would recommend doing this on a background thread because..
Just two rounded corners? [duplicate] http://stackoverflow.com/questions/4845211/just-two-rounded-corners doing this for UIImages so my code isn't exactly set up for use in drawRect but it should be pretty easy to adapt it. You're basically just building up a path and then clipping the context to it. Edit To explain the bitmask part it's just an enum..
iPhone GPS Development - Tips + Tricks [closed] http://stackoverflow.com/questions/488088/iphone-gps-development-tips-tricks share improve this question I don't know of any specific list but here are a few of things you should keep in mind You're not doing GPS lookups. You're doing Core Location lookups. Core Location might or might not be getting its information from.. I don't know of any specific list but here are a few of things you should keep in mind You're not doing GPS lookups. You're doing Core Location lookups. Core Location might or might not be getting its information from GPS. Lots of people still..
Drawing waveform with AVAssetReader http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader AVAssetReaderStatusUnknown Something went wrong. Handle it. if reader.status AVAssetReaderStatusCompleted You're done. It worked. NSLog @ rendering output graphics using normalizeMax f normalizeMax UIImage test self audioImageLogGraph..
xcode 4 debugging shows 'Summary Unavailable' for most objects http://stackoverflow.com/questions/5301582/xcode-4-debugging-shows-summary-unavailable-for-most-objects is For years things worked smoothly then Apple stepped in again. Thanks iphone xcode share improve this question You're not going wrong Xcode 4 is. This problem is pretty common unfortunately. Report it at http bugreport.apple.com and hope..
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 all that color information. I saw a ~18 reduction in rendering time by binning the colors in one of my larger models. You're already using VBOs so you've taken advantage of that optimization. Don't halt the rendering pipeline at any point. Cut out..
What are the limitations of NSUserDefaults? http://stackoverflow.com/questions/6173625/what-are-the-limitations-of-nsuserdefaults objects in a property list or Core Data are all valid options for storing user data such as model objects you created. You're not going to see a speed difference but it's still best to pick the correct mechanism for what you're doing. If it's just..
UIScrollView : paging horizontally, scrolling vertically? http://stackoverflow.com/questions/728014/uiscrollview-paging-horizontally-scrolling-vertically OR vertically but not both simultaneously. iphone objective c uiscrollview share improve this question You're in a very tough situation I must say. Note that you need to use a UIScrollView with pagingEnabled YES to switch between..
Objective-C NSMutableArray mutated while being enumerated? http://stackoverflow.com/questions/8834031/objective-c-nsmutablearray-mutated-while-being-enumerated them. iOS doesn't use an interrupt model for timer callbacks they have to wait their turn just like any other event You're probably doing something like for id object in myArray if someCondition myArray removeObject object You can't edit a mutable..
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