Objective-C APIClient

APIClient.h

#import <Foundation/Foundation.h>

@interface APIClient : NSObject

@property(strong,nonatomic) NSString *urlString;
@property(strong, nonatomic) NSURL *url;
@property(strong, nonatomic) NSURLSessionDataTask *downloadTask;

-(void)sendAPICallWith:(void (^)(NSDictionary * dictionary))completionHandler;
-(id)initWithURLString:(NSString *)url;

@end

APIClient.m

#import "APIClient.h"

@implementation APIClient

- (id) init {
    if (self = [super init]) {
        return self;
    } else {
        return nil;
    }
}

-(id)initWithURLString:(NSString *)url {
    self.urlString = url;
    return [self init];
}

-(void)sendAPICallWith:(void (^)(NSDictionary * dictionary))completionHandler {
    self.url = [NSURL URLWithString:self.urlString];
    NSURLSession *session = [NSURLSession sharedSession];
    self.downloadTask = [session dataTaskWithURL: self.url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
        if (completionHandler) {
            completionHandler(json);
        }
    }];
    [self.downloadTask resume];
    
}

@end