NSArray life cycle

I create an NSArray object in .h file:

NSArray *tempArray;

and than I alloc it in .m file in viewDidLoad() metho开发者_开发百科d:

tempArray = [[NSArray alloc] init]; //initilaize
tempArray = [connect connectSeriesJSonBack]; //fill it (I try it works)

But I want to use this array in another method like:

    - (void)scrollViewDidEndDecelerating:(UIScrollView *)_scrollView 

How can i organize array lifecycle because I use alloc, retain etc. no way the reach array data again.

Don't release the array in the method, and instead release it in the dealloc method -- that way you can use it other places.

Otherwise there is another problem here.

Here you create a retained, empty, immutable NSArray

tempArray = [[NSArray alloc] init];

And now you overwrite the pointer to that retained instance, yay, you just leaked an NSArray

tempArray = [connect connectSeriesJSonBack];

And that method should be returning an autoreleased NSArray. Which will be automatically released and go away once you hit an event loop.

You should do something like this

-(void)whereverThisIs {
    // Do not retain here if connectSeriesJSonBack returns a retained instance
    tempArray = [[connect connectSeriesJSonBack] retain];
 }

 -(void)dealloc {
     [tempArray release];
 }

 -(void)anotherMethod {
     if ( tempArray ) { // Do things }
 }

Your second assignment for tempArray will generate a memory leak because the allocation can never be accessed again. connectSeriesJSonBAck will probably return a autoreleased NSArray. If you want to keep referencing it outside of the current scope then you should retain it:

instead of:

tempArray = [[NSArray alloc] init]; //initilaize
tempArray = [connect connectSeriesJSonBack]; //fill it (I try it works)

do

tempArray = [connect connectSeriesJSonBack];
[tempArray retain];

and add [tempArray release] in your class' dealloc method.

If you want to access the same array within the class then you can probably try making it a class variable so that its members can be accessed throughout the class.

I suggest to declar it in implemantation like

@implementation YourViewController

NSMutableArray *mutableExample;
// or 
NSArray *example;

then in -()viewdidload alloc it like mutableExample = [[[NSMutableArray alloc] init]retain]; or just example = [[NSArray alloc] init];

and the you can use it every where.do not forget to release it!!!

hope it helps if something is unclear ask it in the comment

wblade

If you return an autoreleased array from the function [connect connectSeriesJSonBack]; than your tempArray will be have a return count of 0 after the viewDidLoad method.

There are 2 approaches how to make it work

1) use an NSMutableArray object and add the objects

tempArray = [[NSMutableArray alloc] init];
[tempArray addObjectsFromArray:[connect connectSeriesJSonBack]];

2) retain the returned array

tempArray = [[connect connectSeriesJSonBack] retain];