How to work with one array in two methods - ios

Question

How can i insert value in array in one method and work with this full of value array in other method.
-(void)firstMethod {
NSMutableArray *array = [[NSMutableArray alloc] init];
../// add some value in array.
}
-(void)secondMethod {
..// here i want to work with array which consist of value from first method.
}

Answer 1

You can create one instance of NSMutableArray and use that in the both method.
#interface ViewController () {
NSMutableArray *array;
}
#end
Now access this array in both methods
-(void)firstMethod {
array = [[NSMutableArray alloc] init];
[array addObject:#"Hello"];
}
-(void)secondMethod {
if (array) {
[array addObject:#"World"];//Add object that you want
}
else {
array = [[NSMutableArray alloc] init];
[array addObject:#"World"];
}
}

Answer 2

You can declare a NSMutableArray property
#interface ViewController ()
#property(nonatomic,strong)NSMutableArray *array;
#end
create instance in init method
- (instancetype)init{
if(self == [super init]) {
_array = [NSMutableArray array];
}
return self;
}
-(void)firstMethod {
[self.array addObject:#"obj1"];
}
-(void)secondMethod {
[self.array addObject:#"obj2"];
}

Answer 3

YOU CAN USE BELOW CODE:
#property (nonatomic, strong) dispatch_queue_t concurrentQueue;
_concurrentQueue= dispatch_queue_create("any String", DISPATCH_QUEUE_CONCURRENT);
- (NSArray *)secondMethod
{
__block NSArray *array;
dispatch_sync(self.concurrentQueue, ^{
array= [NSArray arrayWithArray:array];
});
return array;
}
- (void)firstMethod:(NSString *)str
{
if (str) {
dispatch_barrier_async(self.concurrentQueue, ^{
[array addObject:str];
dispatch_async(dispatch_get_main_queue(), ^{
//Do some asynchronous work
});
});
}
}

Answer 4

Other answers suggest you to declare array as property. But usually it's more clear to just pass needed data as arguments to another method:
-(void)firstMethod {
NSMutableArray *array = [[NSMutableArray alloc] init];
../// add some value in array.
[self secondMethod:array];
}
-(void)secondMethod:(NSArray *)array {
..// here i want to work with array which consist of value from first method.
}