Best way to pass data from Child Modal VC to the Parent View Controller?

Question

What is the best way to pass data from a child modal view to the parent view controller?

I have a Child Modal Login Screen on my iPad app that I want to pass back user i

Answer 1

You can get it by using Protocol, it is Best way.

I will give you the Basic Idea for how to create a Protocol

Also, read this question: How do I create delegates in Objective-C?

Following code give you the basic idea for Protocol, here in below code you can get Button title from MasterViewController to DetailViewController.

#DetailViewController.h

#import 

@protocol MasterDelegate 
-(void) getButtonTitile:(NSString *)btnTitle;
@end


@interface DetailViewController : MasterViewController

@property (nonatomic, assign) id customDelegate; 

#DetailViewController.m

if([self.customDelegate respondsToSelector:@selector(getButtonTitile:)])
{
          [self.customDelegate getButtonTitile:button.currentTitle];    
}

#MasterViewController.m

create obj of DetailViewController

DetailViewController *obj = [[DetailViewController alloc] init];
obj.customDelegate = self;
[self.navigationController pushViewController:reportTypeVC animated:YES];

and add delegate method in MasterViewController.m for get button title.

#pragma mark -
#pragma mark - Custom Delegate  Method

-(void) getButtonTitile:(NSString *)btnTitle;
{
    NSLog(@"%@", btnTitle);

}