NSMutableArray not random enough

[Justsomedesigner]

Hi i made a random text generator using a NSMutableArray shown in the code below ( but with 200 sentences or more ). I wondered if somebody knows how to make it more random because everytime i start the app again its the same "random" order.
What could fix my problem is save it where you left off and load that sentence where you left off when you start the app again ( but i dunno how to ).
Also i would like to know how to prevent the repeating of the sentences.
Please be free to tell me if something , entirely different would be better.
Thanks in advance...

Here's the code

#import "RandomnessViewController.h"

@implementation RandomnessViewController

- (void)viewDidLoad {
	allText = [[NSMutableArray alloc] init];
[allText addObject:@"one sentence"];
[allText addObject:@"another sentence"];
[allText addObject:@"and another"];

}

- (IBAction)setRandomText {
	NSString *text = [allText objectAtIndex:(rand() % [allText count])];
	[randomText setText:text];
	
}

[Kalimba]

The 'rand' function has deterministic behavior, which means it's designed to purposely give the same sequence of random values, given the same seed.

Replace the call to 'rand' with 'arc4random'. The 'arc4random' function doesn't provide the same type of deterministic behavior as 'rand'.

[Duncan C]

Originally Posted by Justsomedesigner

Hi i made a random text generator using a NSMutableArray shown in the code below ( but with 200 sentences or more ). I wondered if somebody knows how to make it more random because everytime i start the app again its the same "random" order.
What could fix my problem is save it where you left off and load that sentence where you left off when you start the app again ( but i dunno how to ).
Also i would like to know how to prevent the repeating of the sentences.
Please be free to tell me if something , entirely different would be better.
Thanks in advance...

Here's the code

#import "RandomnessViewController.h"

@implementation RandomnessViewController

- (void)viewDidLoad {
	allText = [[NSMutableArray alloc] init];
[allText addObject:@"one sentence"];
[allText addObject:@"another sentence"];
[allText addObject:@"and another"];

}

- (IBAction)setRandomText {
	NSString *text = [allText objectAtIndex:(rand() % [allText count])];
	[randomText setText:text];
	
}

Use arc4random() in place of rand(). It is a self-seeding random number generator that generates better random numbers.

[Justsomedesigner]

Yes thank you , both of you..
That really did the trick. Now it really IS random.
With the arc4random() instead of rand() everytime i start the app
it's in a different order.