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2014/10/15 ¤U¤È 10:10:14

iphone Programming Glossary: immutable

Why do weak NSString properties not get released in iOS?

http://stackoverflow.com/questions/11107729/why-do-weak-nsstring-properties-not-get-released-in-ios

trickery to reuse objects and avoid unnecessary allocations and copies. It can do this because NSString instances are immutable. In this case there is probably a shared instance to represent an empty string which is being returned by NSString alloc..

NSFetchedResultsController with sections created by first letter of a string

http://stackoverflow.com/questions/1112521/nsfetchedresultscontroller-with-sections-created-by-first-letter-of-a-string

NSArray arrayWithObject nameInitialProperty NSARRAY tempPropertyArray RETURNS CFArray 0xf54090 0x30307a00 type immutable count 1 values 0 NSAttributeDescription 0xf2df80 name committeeNameInitial isOptional 1 isTransient 1 entity CommitteeObj..

How to add to an NSDictionary

http://stackoverflow.com/questions/3159844/how-to-add-to-an-nsdictionary

share improve this question A mutable dictionary can be changed i.e. you can add and remove objects. An immutable is fixed once it is created. create and add NSMutableDictionary dict NSMutableDictionary alloc initWithCapacity 10 dict..

How Do I sort an NSMutable Array with NSNumbers in it?

http://stackoverflow.com/questions/3205792/how-do-i-sort-an-nsmutable-array-with-nsnumbers-in-it

NSMutableArray addObject: -[__NSArrayI addObject:]: unrecognized selector sent to instance

http://stackoverflow.com/questions/3220120/nsmutablearray-addobject-nsarrayi-addobject-unrecognized-selector-sent-t

this question The synthesized setter for @property copy sends a copy message to the array which results in an immutable copy. You have no choice but the implement the setter yourself here as detailed in the Objective C guide. share improve..

NSMutableString as retain/copy

http://stackoverflow.com/questions/4995254/nsmutablestring-as-retain-copy

quite yet should be the default. the reason as stated by other posters is that the implementation of an immutable instance can simply retain itself in its implementation of copyWithZone . also copy gives you the expected behavior. in.. . also copy gives you the expected behavior. in other words there is not a use for retaining a string if it is in fact immutable. in order to guarantee that you're dealing with an immutable string you simply copy at creation and set. If yes can I just.. is not a use for retaining a string if it is in fact immutable. in order to guarantee that you're dealing with an immutable string you simply copy at creation and set. If yes can I just replace retain to copy in my app and remove the release in..

how to do true deep copy for NSArray and NSDictionary with have nested arrays/dictionary?

http://stackoverflow.com/questions/5453481/how-to-do-true-deep-copy-for-nsarray-and-nsdictionary-with-have-nested-arrays-di

example for me I'm trying to load save the following config with NSUserDefaults and when loading need to convert the immutable copies one gets from NSUserDefault to mutable prior to making changes. Items NSDictionary Item NSDictionary aString NSString..

NSString retainCount is 2147483647 [duplicate]

http://stackoverflow.com/questions/5483357/nsstring-retaincount-is-2147483647

constant strings and decides that your particular code has no need of a second space consuming copy of a constant immutable string and thus returns the already existing constant string. I.e. a singleton. Of a class whose instances are only ever..

What is __NSArrayI and __NSArrayM? How to convert to NSArray?

http://stackoverflow.com/questions/7684611/what-is-nsarrayi-and-nsarraym-how-to-convert-to-nsarray

class. iphone objective c ios nsarray nsobject share improve this question __NSArrayI is a code word for an immutable array that is a regular NSArray which you cannot change. __NSArrayM is a code word for a mutable array that is NSMutableArray..

iPhone fetch data dictionary from keychain

http://stackoverflow.com/questions/7827730/iphone-fetch-data-dictionary-from-keychain

lets ARC know about this responsibility so it will be able to do it for us automatically. Don't cast the immutable Core Foundation dictionary returned by SecItemCopyMatching to NSMutableDictionary that's just wrong. Also it is against..

What's the best way to use Obj-C 2.0 Properties with mutable objects, such as NSMutableArray?

http://stackoverflow.com/questions/816720/whats-the-best-way-to-use-obj-c-2-0-properties-with-mutable-objects-such-as-ns

2.0 class that has an NSMutableArray property. If I use the following code then the synthesised setter will give me an immutable copy not a mutable one @property readwrite copy NSMutableArray myArray Is there any reason that Apple didn't implement the..

why is “error:&error” used here (objective-c)

http://stackoverflow.com/questions/8334518/why-is-errorerror-used-here-objective-c

local only error SomeNSErrorSubclass alloc init... autorelease local only Reason #2 instances of NSError are immutable Let's keep the same function declaration but call the function like this NSError error NSError alloc init... autorelease.. to check for specific error information inside the if block you would be out of luck because instances of NSError are immutable . This means that once they are created you cannot modify their properties so the function would not be able to change the..

The model used to open the store is incompatible with the one used to create the store

http://stackoverflow.com/questions/8881453/the-model-used-to-open-the-store-is-incompatible-with-the-one-used-to-create-the

operation couldn ™t be completed. Cocoa error 134100. UserInfo 0x8829cd0 metadata CFBasicHash 0x882a370 0x1839b38 type immutable dict count 7 entries 2 CFString 0x8829b90 0x1839b38 contents NSStoreModelVersionIdentifiers CFArray 0x8829ff0 0x1839b38.. 7 entries 2 CFString 0x8829b90 0x1839b38 contents NSStoreModelVersionIdentifiers CFArray 0x8829ff0 0x1839b38 type immutable count 0 values 4 CFString 0x8829bc0 0x1839b38 contents NSPersistenceFrameworkVersion CFNumber 0x8829770 0x1839b38 value.. 6 CFString 0x8829bf0 0x1839b38 contents NSStoreModelVersionHashes CFBasicHash 0x882a080 0x1839b38 type immutable dict count 1 entries 0 CFString 0x882a010 0x1839b38 contents AlkitabDB CFData 0x882a030 0x1839b38 length 32 capacity 32..