HTTPLoader

HTTPLoader.m

//
//  HTTPLoader.h
//

#import <Foundation/Foundation.h>

typedef void(^ HTTPLoaderCompletionBlock)(NSData *data, NSError *erorr);

@interface HTTPLoader : NSObject

+ (void)loadAsync:(NSURLRequest *)request complete:(HTTPLoaderCompletionBlock)block;

@end


//
//  HTTPLoader.m
//

#import "HTTPLoader.h"

@interface HTTPFetcher : NSObject

@property (copy, nonatomic) HTTPLoaderCompletionBlock completionBlock;

@end

@implementation HTTPFetcher {
    NSMutableData *receivedData;
    NSInteger statusCode;
}

- (id)init {
    self = [super init];
    if (self) {
        receivedData = [NSMutableData data];
    }
    return self;
}

- (void)requestGet:(NSURLRequest *)request {
    NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
    [connection start];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
        NSHTTPURLResponse *res = (NSHTTPURLResponse *)response;
        statusCode = res.statusCode;
        if (statusCode >= 400) {
            [connection cancel];
            
            NSError *error = [NSError errorWithDomain:NSURLErrorDomain code:statusCode userInfo:nil];
            [self connection:connection didFailWithError:error];
        }
    }
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [receivedData appendData:data];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    if (self.completionBlock) {
        self.completionBlock(receivedData, nil);
    }
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    if (self.completionBlock) {
        self.completionBlock(nil, error);
    }
}

@end


@implementation HTTPLoader

+ (void)loadAsync:(NSURLRequest *)request complete:(HTTPLoaderCompletionBlock)block {
    HTTPFetcher *fetcher = [[HTTPFetcher alloc] init];
    fetcher.completionBlock = ^(NSData *data, NSError *error) {
        if (block) {
            block(data, error);
        }
    };
    [fetcher requestGet:request];
}

@end

[NSURLConnect sendSynchronizedRequest...]を使えばいいじゃないですか。。