Random Number Array in Objective C

Hi, i think this is a common and basic requirement for every developer in each field, to get the Random numbers in Array. I have made a function to simplify this logic in Objective C.

So here is the code if this

-(void) checkExistance:(int) max

{

    int value = [self randomNumberFrom:0 to:max];//Modify according to minimum /maximum value in Array

    int i = 0;

    for (i = 0; i < [self.numbers count]; i++)

        if ([[self.numbers objectAtIndex:i] integerValue] == value)

            break;

    

    if (i == [self.numbers count])

        [self.numbers addObject:[NSNumber numberWithInt:value]];

    if ([self.numbers count] != max)

        [self checkExistance:max];

}

- (int) randomNumberFrom: (int) minValue to: (int) maxValue

{

    int rangeValue = maxValue - minValue;

    return (arc4random() % rangeValue) + minValue;

}

You just need to call checkExistance method with passing a maximum value in this. You can modify your code for minimum and maximum as well in this. 

Now just call

[self checkExistance:6];

and you will see the result by following

for(int j = 0;j<self.numbers.count;j++)

{

    NSLog(@" %@", [self.numbers objectAtIndex:j]);

}

How to work with NSMutable Array and For Loop in xCode

first declare the Mutable Array in filename.h

#import <Foundation/Foundation.h>

@interface FileNameAsClassName: NSObject

{

    NSMutableArray *users;

}

@property(nonatomic,strong) NSMutableArray *users;

@end;

Now define this users array in filename.m

#import "FileNameAsClassName.h"

@implementation FileNameAsClassName

@synthesize users;

Now use this to add Objects in any function, where you required, after initialize

//Initializing

users = [[NSMutableArray alloc] init];

//Inserting Objects in some function, where required

[users addObject:someObjectName];

Now use this as below in required function 

for(int i=0;i<users.count;i++)

{

    someObjectName = [users objectAtIndex:i];

    //Now use someObjectName as Obejct, which you have inserted

}