Difference Between Completion Handler and Blocks : [iOS]

Question

I am messed with both completion handler and blocks while I am using them in Swift and Objective-C. And when I am searching blocks in Swift

Answer 1

I am hope this will help.

First Step:

#import 

@interface ViewController : UIViewController


-(void)InsertUser:(NSString*)userName InsertUserLastName:(NSString*)lastName  widthCompletion:(void(^)(NSString* result))callback;

@end

Second Step :

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

-(void)InsertUser:(NSString *)userName InsertUserLastName:(NSString*)lastName widthCompletion:(void (^)(NSString* result))callback{

    callback(@"User inserted successfully");

}
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    [self InsertUser:@"Ded" InsertUserLastName:@"Moroz" widthCompletion:^(NSString *result) {

        NSLog(@"Result:%@",result);

    }];

}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end