How to Shuffle the Array

Hello friends!

Here is the very simple and easy example to shuffle array  values
here we go!
Just copy and paste in your .m file

 >>randomNo is NSMutableArray
>>ran is int value
>>
//random shuffle generate start

static NSUInteger random_below(NSUInteger n)

{

    int ran;

    ran = 1+ arc4random() % 5;

    //NSLog(@"random>>>%i",ran);

    NSUInteger m = ran;

    

    // Compute smallest power of two greater than n.

    // There's probably a faster solution than this loop, but bit-twiddling

    // isn't my specialty.

    do {

        m <<= 1;

    } while(m < n);

    

    NSUInteger ret;

    

    do {

        ret = random() % m;

    } while(ret >= n);

    

    return ret;

}

- (void)shuffle {

    for(NSUInteger i = [randomNo count]; i > 1; i--) {

        NSUInteger j = random_below(i);

        [randomNo exchangeObjectAtIndex:i-1 withObjectAtIndex:j];

    }

    NSLog(@"this is shuffle array %@",randomNo);

}

//random shuffle  generat end

iOS NSNotification

NSNotification is a great and simple way to inform other 

methods to trigger in different classes

eg : we have two classes : class A and class B , in class B 

we perform some tasks and we have to inform class A that 

class B has finished it's task so, we can handle this by

simple implementation of two piece of code : one is post 

notification which has to implement in class B and other one

will be implemented in class A which will receive notification from class 

Class B:

Below method you can implement after completing any task with any

 key liek ("Task_done")

    [[NSNotificationCenter defaultCenter]

     postNotificationName:@"Task_done"

     object:self];

Class A:

This class will receive notification with the same key , and it

 will automatically call the method (AfterTaskDone:)

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(AfterTaskDone:)

                                                 name:@"Task_done"        object:nil];

-(void)AfterTaskDone{

    

}