How do you generate a random number when a button is clicked, and depending on that number, different actions take place.
I probably only need a random number from 1-10.
-(IBAction)buttonClicked{ "generate the random number" if(number == 1){ something happens } else if(number == 2){ something else happens } etc } There are a few problems with rand() which there are loads of posts about and they recommend that you use arc4random() instead. This function is seeded automatically and has a 'better' algorithm for number generation.
int myNumber = arc4random() % 10 This would mean that myNumber would be between 0-9.
So in your case you want:
int number = (arc4random() % 2) + 1; which would give you a range of 1-2.
And please, please, if you are generating a random number from 1 to 10... use switch rather than a pile of if {} else if {} clauses:
switch (arc4random() % 10){ case 0: //blah blah break; case 1: //blah blah break; //etc etc } 
If you need a cryptographically secure random number you may use:
int SecRandomCopyBytes ( SecRandomRef rnd, size_t count, uint8_t *bytes ); as described here.
I have had good success with arc4random() - just modulus it to set a range. For instance:
arc4random() % 100;
I would actively avoid using rand() as it does not produce truly random numbers and it needs to be seeded.
NSArray *arr=[NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10", nil]; NSMutableArray *valueArray=[[NSMutableArray alloc]init]; int count=0; while(count<5) { int rand= arc4random()%10; NSLog(@"%d",rand); NSString *str=[arr objectAtIndex:rand]; if(![valueArray containsObject:str]) { [valueArray addObject:str]; count++; } } NSLog(@"%@",valueArray); 