Question

I am using below code to check ary_navigationControllerViews array contains myclass object or not its working fine but i need with out for loop.I know we have method like containsObject but how to use in this situation. Is there any way to check this condition with out using for loop.

NSArray *ary_navigationControllerViews = [[NSArray alloc] initWithArray:[self.navigationController viewControllers]];
    for(id obj_viewController in ary_navigationControllerViews) {
        if([obj_viewController isKindOfClass:[myClass  class]]) {
            //some my code
            return;
        }
    }

Answer 1

NSPredicate does this kind of jobs a lot simpler.

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY SELF.class.description == %@", [[myClass class] description]];
BOOL exists =  [predicate evaluateWithObject:ary_navigationControllerViews];
if (exists) {
    //some my code
    return;
}

To get the view controller instance, you can use the following code.

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self.class.description == %@", [[self class] description]];
NSArray *vcs = [ary_navigationControllerViews filteredArrayUsingPredicate:predicate];
if ([vcs count] > 0) {
    id vc = [vcs objectAtIndex:0];
    // Now vc is the view controller you are looking for
}