¡@
2014/10/15 ¤U¤È 10:04:58
iphone Programming Glossary: cfWhat programming skills I need to become an iPhone developer? [closed] http://stackoverflow.com/questions/1043820/what-programming-skills-i-need-to-become-an-iphone-developer as you can all on one thread. For C developers I push C developers to stay away from Core Foundation things that start CF . Core Foundation is very useful but it's too easy to let it become a crutch to avoid actually learning Cocoa. It's better..
NSArray becomes NSCFArray when passed http://stackoverflow.com/questions/1438860/nsarray-becomes-nscfarray-when-passed becomes NSCFArray when passed I have a method that receives many different kinds of objects and decides what to do with them void performAction.. controller performAction myAction withItem nil ...the custom action is never called because it reads myAction as an NSCFArray rather than an NSArray. When I try myAction isMemberOfClass NSCFArray class it doesn't recognise the CF. The simple.. never called because it reads myAction as an NSCFArray rather than an NSArray. When I try myAction isMemberOfClass NSCFArray class it doesn't recognise the CF. The simple way to get it working at the moment is just to assume that anything not..
CGBitmapContextCreate on the iPhone/iPad http://stackoverflow.com/questions/2619224/cgbitmapcontextcreate-on-the-iphone-ipad so you run out of memory and die. I'm not sure how Core Foundation deals with temporary objects though. I don't think CF objects have the equivalent of autorelease and a Core Graphics context is almost certainly dealing with CF objects rather.. don't think CF objects have the equivalent of autorelease and a Core Graphics context is almost certainly dealing with CF objects rather than NSObjects. To reduce the memory churn in your code I would suggest refactoring it to create an offscreen..
Converting plist to binary plist http://stackoverflow.com/questions/264440/converting-plist-to-binary-plist which is opensource. CoreFoundation can be directly built and run on Linux and Windows so you can write a CF tool using the normal APIs you would use on Mac OS X but build and run it on other platforms. The particular API you want.. you would use on Mac OS X but build and run it on other platforms. The particular API you want to be looking at is CFPropertyListWriteToStream . The code for CoreFoundation is available from Apple tarball among other places. Finally depending.. content you may see a significant size reduction by uniquing them. You can enable that by hacking up _flattenPlist in CFBinaryPlist.c . If you do that make sure to test it very thoroughly and do not do on any files you cannot update over the..
Objective-c iPhone percent encode a string? http://stackoverflow.com/questions/3423545/objective-c-iphone-percent-encode-a-string iphone objective c share improve this question I've found that both stringByAddingPercentEscapesUsingEncoding and CFURLCreateStringByAddingPercentEscapes are inadequate. The NSString method misses quite a few characters and the CF function.. and CFURLCreateStringByAddingPercentEscapes are inadequate. The NSString method misses quite a few characters and the CF function only lets you say which specific characters you want to escape. The proper specification is to escape all characters..
NSMutableString as retain/copy http://stackoverflow.com/questions/4995254/nsmutablestring-as-retain-copy garbage collected environments. immutable strings are still reference counted. there are exceptions to this notably CF NS String literals exist for the program's duration you can use CF APIs to create strings which are never released or are.. counted. there are exceptions to this notably CF NS String literals exist for the program's duration you can use CF APIs to create strings which are never released or are managed beyond the scope of traditional retain release mechanisms..
Objective C HTML escape/unescape http://stackoverflow.com/questions/659602/objective-c-html-escape-unescape html objective c cocoa touch escaping share improve this question This link contains the solution below. Cocoa CF has the CFXMLCreateStringByUnescapingEntities function but that's not available on the iPhone. @interface MREntitiesConverter.. c cocoa touch escaping share improve this question This link contains the solution below. Cocoa CF has the CFXMLCreateStringByUnescapingEntities function but that's not available on the iPhone. @interface MREntitiesConverter NSObject..
Weak and strong property setter attributes in Objective-C http://stackoverflow.com/questions/7912555/weak-and-strong-property-setter-attributes-in-objective-c between weak and strong property setter attributes in Objective C @property retain weak strong __attribute__ NSObject CFDictionaryRef myDictionary What is the impact and benefit I heard that weak is not available on iOS 4 and we need to use.. child and the child retains the parent so neither is ever released . The 'toll free bridging' part casting from NS to CF is a little tricky. You still have to manually manage CFRelease and CFRetain for CF objects. When you convert them back.. released . The 'toll free bridging' part casting from NS to CF is a little tricky. You still have to manually manage CFRelease and CFRetain for CF objects. When you convert them back to NS objects you have to tell the compiler about the retain..
http://stackoverflow.com/questions/806115/toll-free-bridges and Objective C in general over the last few weeks I have come across numerous mentions of 'Toll free bridges' between CF and NS frameworks. One particular example would be CFStream and NSStream. Does a resource exists documenting all of these.. come across numerous mentions of 'Toll free bridges' between CF and NS frameworks. One particular example would be CFStream and NSStream. Does a resource exists documenting all of these bridges and how to use them Is it just as simple as.. I am using NSStream calls that are not stricly allowed within the iPhone SDK and understand that I should be using CFStream calls. EDIT A useful article about how TFB works iphone objective c osx core share improve this question Toll..
how to to make gesturerecognizer working in an animating UIImage view http://stackoverflow.com/questions/8340329/how-to-to-make-gesturerecognizer-working-in-an-animating-uiimage-view @ 7 @ 9 @ 11 @ 27 @ 6 nil self.defaultImageCaption NSMutableArray alloc initWithObjects @ Ver @ Green @ Red @ CF @ Dwarf nil default image imageViewTop.alpha 1.0 imageViewBottom.alpha 0.0 imageViewBottom UIImageView alloc initWithFrame..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons know the rules in order to bridge correctly with Core Foundation and every intermediate programmer needs to deal with CF at some point. And you need to know the rules for mixed ARC MRC code. And you need to know the rules when you start messing..
How to activate Cycles reporting in Instruments under ARC? http://stackoverflow.com/questions/8852451/how-to-activate-cycles-reporting-in-instruments-under-arc I found the it in Leaks under Cycles Roots . However I've found it less than useful when using ARC. It does detect CF leaks and apparently I'm leaking a recursive block which I can't do anything about but I've had to root out several retain..
UIImageWriteToSavedPhotosAlbum save as PNG with transparency? http://stackoverflow.com/questions/1489250/uiimagewritetosavedphotosalbum-save-as-png-with-transparency UIImage _compositeImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return _compositeImage cf. https developer.apple.com iphone library documentation iPhone Conceptual iPhoneOSProgrammingGuide FilesandNetworking FilesandNetworking.html#..
size of NSCachesDirectory in iphone http://stackoverflow.com/questions/2224642/size-of-nscachesdirectory-in-iphone YES _cacheFolderSize _cacheFileAttributes fileSize return _cacheFolderSize EDIT The value returned will be in bytes cf. http developer.apple.com mac library documentation Cocoa Reference Foundation Classes NSFileManager_Class Reference Reference.html#..
Create a table of contents from a pdf file http://stackoverflow.com/questions/2556344/create-a-table-of-contents-from-a-pdf-file objectInteger NSLog pdf integer value ld long int objectInteger test other object type cases here cf. http developer.apple.com mac library documentation GraphicsImaging Reference CGPDFObject Reference reference.html# apple_ref..
Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs http://stackoverflow.com/questions/3161385/install-xcode-3-2-3-w-iphone-sdk-4-get-base-sdk-missing-cant-see-other-sdk not limit downward what iOS version you can program to or support. Once you've patched things up in your project etc. cf. next section you can set iPhone OS Deployment Target to a lower iOS version. For a quick shot of how to do this cf. step.. cf. next section you can set iPhone OS Deployment Target to a lower iOS version. For a quick shot of how to do this cf. step 7 in the next section. Note that you are now entering some tricky terrain. Your usual Xcode 3.2.3 compiler will no.. to prevent crashes on 3.0 devices. Fun. You can still download from Apple and install a previous Xcode version or SDK cf. here . Yes you can install multiple Xcode versions in different directories i.e. put only one version in Developer. You..
Install Xcode 3.2.4, get “Base SDK Missing” http://stackoverflow.com/questions/3677487/install-xcode-3-2-4-get-base-sdk-missing the Base SDK does not downward limit what iOS versions you can support. In fact there are two different settings cf. Change Base SDK above. If you remain confused take heart and read my detailed post on the previous switchover which is..
http://stackoverflow.com/questions/8032652/is-it-ok-to-use-of-a-notification-to-communication-back-to-the-main-thread-of-an it ok to use of a notification to communication back to the main thread of an IOS app cf performSelectorOnMainThread Is it ok to use of a notification to communication back to the main thread of an IOS app cf.. performSelectorOnMainThread Is it ok to use of a notification to communication back to the main thread of an IOS app cf performSelectorOnMainThread . That is there are are there any gottcha's for this purpose Background want to call back to..
|