How to select random method using perform selector?

Question

In my application I use performSelector to call methods. I have three different methods in my application, I want that randomly I assign one of these three methods to perform selector. Here is my code.

[self performSelector:@selector()];

Here is my three methods..

-(void)Act1
{
}

-(void)Act2
{
}

-(void)Act3
{
}

Now I want to assign each time one method randomly to selector. Can any one guide me how I can do this.

Answer 1

This should do it:

int rand = (arc4random() % 3) + 1;
[self performSelector:NSSelectorFromString([NSString stringWithFormat:@"Act%d",rand])];

Answer 2

Use an array of selectors, SEL is their type.

SEL mySelectors[3] = { @selector(Act1), @selector(Act2), @selector(Act3) };
[self performSelector:mySelectors[rand() % 3]];

You may want to suppress the warning issued by ARC about a potential memory leak, it's safe since your methods are void. Use objc_msgSend or wrap the code like this:

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
    [self performSelector:mySelectors[rand() % 3]];
#pragma clang diagnostic pop

Answer 3

You could put 3 strings in an array representing your methods, pick randomly one and the use Nsselectorfromstring to get your selector