NSURLSession Code Examples

https://www.objc.io/issues/5-ios7/from-nsurlconnection-to-nsurlsession/

https://code.tutsplus.com/tutorials/networking-with-nsurlsession-part-1--mobile-21394

    
- (void)viewDidLoad {
    [super viewDidLoad];
 
    NSURLSession *session = [NSURLSession sharedSession];
}
- (void)viewDidLoad {
    [super viewDidLoad];
 
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithURL:[NSURL URLWithString:@"https://itunes.apple.com/search?term=apple&media=software"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
        NSLog(@"%@", json);
    }];
}

- (void)viewDidLoad {
    [super viewDidLoad];
 
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithURL:[NSURL URLWithString:@"https://itunes.apple.com/search?term=apple&media=software"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
        NSLog(@"%@", json);
    }];
 
    [dataTask resume];
}
#import 
 
@interface MTViewController : UIViewController
 
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UIProgressView *progressView;
 
@end

- (void)viewDidLoad {
    [super viewDidLoad];
 
    NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration delegate:self delegateQueue:nil];
    NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithURL:[NSURL URLWithString:@"http://cdn.tutsplus.com/mobile/uploads/2013/12/sample.jpg"]];
    [downloadTask resume];
}
#import "MTViewController.h"
 
@interface MTViewController () 
 
@end

- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location {
    NSData *data = [NSData dataWithContentsOfURL:location];
 
    dispatch_async(dispatch_get_main_queue(), ^{
        [self.progressView setHidden:YES];
        [self.imageView setImage:[UIImage imageWithData:data]];
    });
}
 
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes {
 
}
 
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite {
    float progress = (double)totalBytesWritten / (double)totalBytesExpectedToWrite;
 
    dispatch_async(dispatch_get_main_queue(), ^{
        [self.progressView setProgress:progress];
    });
}

/

http://demianturner.com/2016/08/synchronous-nsurlsession-in-obj-c/

    
#import "NSURLSession+DTAdditions.h"

@implementation NSURLSession (DTAdditions)

+ (NSData *)requestSynchronousData:(NSURLRequest *)request
{
    __block NSData *data = nil;
    dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *taskData, NSURLResponse *response, NSError *error) {
        data = taskData;
        if (!data) {
            NSLog(@"%@", error);
        }
        dispatch_semaphore_signal(semaphore);
        
    }];
    [dataTask resume];
    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
    return data;
}

+ (NSData *)requestSynchronousDataWithURLString:(NSString *)requestString
{
    NSURL *url = [NSURL URLWithString:requestString];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    return [self requestSynchronousData:request];
}

+ (NSDictionary *)requestSynchronousJSON:(NSURLRequest *)request
{
    NSData *data = [self requestSynchronousData:request];
    NSError *e = nil;
    NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&e];
    return jsonData;
}

+ (NSDictionary *)requestSynchronousJSONWithURLString:(NSString *)requestString
{
    NSURL *url = [NSURL URLWithString:requestString];
    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url
                                                              cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                          timeoutInterval:50];
    theRequest.HTTPMethod = @"GET";
    [theRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    return [self requestSynchronousJSON:theRequest];
}

@end

/