How to pass array value from one class to other class - iphone

Question

How can i pass an array value from a delegate class to view controller class
const char *query2=[tempQuery UTF8String];
NSMutableArray *arr1 = [[NSMutableArray alloc]init];;
if (sqlite3_prepare_v2(database,query2,-1,&statement1,NULL)==SQLITE_OK) {
//NSLog(#"vt", vt);
while (sqlite3_step(statement1)==SQLITE_ROW) {
vt=[[[Question1 alloc]init]autorelease];
vt.question=[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement1,3)];
[arr1 addObject:vt.question];
NSLog(#"arr1 is %#",[arr1 description]);
Where arr1 is an array value. So that array value has to pass in another class.
Thanks in advance.

Answer 1

In a class where you want to pass this "arr1" array do following steps:
1) define a array there (lets say it is aryTest)
2) make property for it
3) synthesize it
Now in a view where you are getting this "arr1" array.
From this view when ever you write code to push to next view do following steps:
NextViewController *objVc = [[NextViewController alloc] initWithNibName:#"NextViewController" bundle:nil];
objVc.aryTest = arr1;
[self.navigationController pushViewController:vc animated:YES];
[vc release];
so by this you will get this arr1 array into next view in aryTest array.

Answer 2

just create a Array method like in +(NSMutableArray *)getData in delegate class
+(NSMutableArray *)getData
{
const char *query2=[tempQuery UTF8String];
NSMutableArray *arr1 = [[NSMutableArray alloc]init];;
if (sqlite3_prepare_v2(database,query2,-1,&statement1,NULL)==SQLITE_OK) {
//NSLog(#"vt", vt);
while (sqlite3_step(statement1)==SQLITE_ROW) {
[arr1 addObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement1,3)]];
NSLog(#"arr1 is %#",[arr1 description]);
}
}
return [arr1 autorelease];
}
in your view controller just call the method like
NSMutableArray * data=[[delegate getData]retain];

Answer 3

Try creating the array in your appDelegate. Thus it can be accessible in any view controller by calling your appDelegate:
myAppDelegate *myDelegate = (myAppDelegate *)[[UIApplication sharedApplication] delegate];
arrayInView = [myDelegate msgFilter];

Answer 4

You can pass NSString or NSMutableArray using NSUserDefault method...
NSUserDefaultExample and Saving/Retrieving Data Using NSUserDefaults
For Saving
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
// saving an NSString
[prefs setObject:#"TextToSave" forKey:#"keyToLookupString"];
// saving an NSInteger
[prefs setInteger:42 forKey:#"integerKey"];
// saving a Double
[prefs setDouble:3.1415 forKey:#"doubleKey"];
// saving a Float
[prefs setFloat:1.2345678 forKey:#"floatKey"];
// saving an array
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:array];
[prefs setObject:data forKey:#"lastResults"]
// This is suggested to synch prefs, but is not needed (I didn't put it in my tut)
[prefs synchronize];
For Retrieving
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
// getting an NSString
NSString *myString = [prefs stringForKey:#"keyToLookupString"];
// getting an NSInteger
NSInteger myInt = [prefs integerForKey:#"integerKey"];
// getting an Float
float myFloat = [prefs floatForKey:#"floatKey"];
// getting an array
NSData *dataRepresentingSavedArray = [prefs objectForKey:#"lastResults"];
if (dataRepresentingSavedArray != nil)
{
NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArray];
if (oldSavedArray != nil)
objectArray = [[NSMutableArray alloc] initWithArray:oldSavedArray];
else
objectArray = [[NSMutableArray alloc] init];
}
or
filename *detailViewController = [[filename alloc] initWithNibName:#"filename" bundle:nil];
detailViewController.audio=#"yourData";
[self presentModalViewController:detailViewController animated:YES];
[detailViewController release];
Declare in filename.h
NSArray *audio;
#property(nonatomic,retain) NSArray *audio;
and filename.m
#synthesize audio;
thats all.