NSURLConnection이 주 스레드에서 실행되고 있지 않음

Question

NSURLConnection doesn't call delegate methods, NSURLConnection didReceiveData not called 이상을 읽었지만 문제를 해결할 수 없습니다. 내 URL이 유효하고 일반적인 nsurlconnection으로 데이터를받을 수 있지만 대리자 방법을 사용하지는 못한다는 것을 확인했습니다.

가져 오기 작업을 설정했지만 대리자 메서드가 호출되지 않습니다. 일부 디버깅 및 연구 후 nsurlconnection이 주 스레드에서 실행되고 있지 않으며 이것이 대리자 메서드가 호출되지 않는 이유라고 생각합니다. 나는 그 밖의 무엇을 시도해야할지 모르겠다. 도움에 감사드립니다.

내 수입 클래스는

#import "importOperation.h" 

@interface importOperation()<NSURLConnectionDelegate> 
@property (nonatomic, strong) NSURL* url; 
@property (nonatomic, strong) NSURLConnection* connection; 
@property (nonatomic, strong) NSMutableData* buffer; 
@property (nonatomic) long long int expectedContentLength; 
@property (nonatomic, readwrite) NSError* error; 
@property (nonatomic) BOOL isExecuting; 
@property (nonatomic) BOOL isConcurrent; 
@property (nonatomic) BOOL isFinished; 
@end 
@implementation importOperation 
-(id)initWithURL:(NSURL *)url 
{ 
    self = [super init]; 
    if (self) { 
     self.url = url; 
    } 
    return self; 
} 
-(void)start 
{ 
    NSURLRequest * request = [NSURLRequest requestWithURL:self.url]; 
    self.isExecuting = YES; 
    self.isConcurrent = YES; 
    self.isFinished = NO; 

    [[NSOperationQueue mainQueue]addOperationWithBlock:^{ 
    self.connection = [NSURLConnection connectionWithRequest:request delegate:self]; 
}]; 

} 
#pragma mark NSURLConnectionDelegate 
-(NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)response 
{ 
    return request; 
} 
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
{ 
    self.expectedContentLength = response.expectedContentLength; 
    self.buffer = [NSMutableData data]; 
} 
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
    [self.buffer appendData:data]; 
    self.progressCallback(self.buffer.length/(float)self.expectedContentLength); 
} 
- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse {// implemented} 
- (void)connectionDidFinishLoading:(NSURLConnection *)connection { 
    self.data = self.buffer; 
    self.buffer = nil; 
    self.isExecuting = NO; 
    self.isFinished = YES; 
} 
- (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error 
{// implemented} 
- (void)setIsExecuting:(BOOL)isExecuting 
{// implemented} 
- (void)setIsFinished:(BOOL)isFinished 
{// implemented} 
- (void)cancel 
{// implemented} 
@end 

이다 난 내 가져 오기 작업 호출 방법

-(void)getStuff:(void(^) (NSArray *result, NSError *error))completion 
{ 

    __block importOperation *anImportOperation = nil; 
    void(^completionBlock)(void)= ^(void){ 
     NSData * importOperationData = [anImportOperation data]; 
     NSError * error; 
     NSDictionary * jsonDictionary = [NSJSONSerialization JSONObjectWithData:importOperationData options:NSJSONReadingMutableContainers error:&error]; 
     NSLog(@"parse data %@",jsonDictionary); 

     completion([jsonDictionary objectForKey:@"data"],error); 
    }; 
    anImportOperation =[[importOperation alloc]initWithURL:[ServiceManager baseURLWithResource:@"beers"]]; 
    [anImportOperation setCompletionBlock:completionBlock]; 
    [self.operationQueue addOperation:anImportOperation]; 

    if ([NSThread isMainThread] ==YES) { 
     completionBlock(); 
    } 
    else{ 
     dispatch_sync(dispatch_get_main_queue(),completionBlock); 
    } 

그리고 이것은 로그 문을입니다

2014-12-22 23:42:58.430 Cheers[4736:621077] requested string https://api.brewerydb.com/v2/beers?key=APIKE 
2014-12-22 23:42:58.456 Cheers[4736:621076] Is NOT main thread 
2014-12-22 23:42:58.520 Cheers[4736:621136] PATH TO SQL STORE /Users/bla/Library/Developer/CoreSimulator/Devices/817B8B49-6316-40BD-ABF1-98C34FFD9299/data/Containers/Data/Application/252FA241-CE21-4C0E-A4DB-32D3DECC9DFB/Documents/CheersDataModel.sqlite 
2014-12-22 23:42:58.647 Cheers[4736:620751] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'data parameter is nil' 
*** First throw call stack: 
(
    0 CoreFoundation      0x000000010dc72f35 __exceptionPreprocess + 165 
    1 libobjc.A.dylib      0x000000010d90bbb7 objc_exception_throw + 45 
    2 CoreFoundation      0x000000010dc72e6d +[NSException raise:format:] + 205 
    3 Foundation       0x000000010d5b01bf +[NSJSONSerialization JSONObjectWithData:options:error:] + 67 
    4 Cheers       0x000000010d006396 __27-[ServiceManager getBeers:]_block_invoke + 118 
    5 libdispatch.dylib     0x00000001105107f4 _dispatch_client_callout + 8 
    6 libdispatch.dylib     0x00000001104fbec9 _dispatch_barrier_sync_f_slow_invoke + 275 
    7 libdispatch.dylib     0x00000001105107f4 _dispatch_client_callout + 8 
    8 libdispatch.dylib     0x00000001104f98fb _dispatch_main_queue_callback_4CF + 949 
    9 CoreFoundation      0x000000010dbdafe9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9 
    10 CoreFoundation      0x000000010db9deeb __CFRunLoopRun + 2043 
    11 CoreFoundation      0x000000010db9d486 CFRunLoopRunSpecific + 470 
    12 GraphicsServices     0x00000001121739f0 GSEventRunModal + 161 
    13 UIKit        0x000000010e2a2420 UIApplicationMain + 1282 
    14 Cheers        0x000000010d009153 main + 115 
    15 libdyld.dylib      0x0000000110545145 start + 1 
) 
libc++abi.dylib: terminating with uncaught exception of type NSException 

Answer 1

귀하의 importOperationData가 그것의 그 이유는, nil입니다 충돌. 서버에서 반환 된 값의 유효성을 검사해야합니다.

NSData * importOperationData = [anImportOperation data]; 
     NSError * error; 

if(importOperationData) 
{ 
    NSDictionary * jsonDictionary = [NSJSONSerialization JSONObjectWithData:importOperationData options:NSJSONReadingMutableContainers error:&error]; 
    if(jsonDictionary) 
    { 
     completion([jsonDictionary objectForKey:@"data"],error); 
    } 
} 

Answer 2

당신이 NSOperation를 서브 클래스 아마도 하지 메인 큐 일부 self.operationQueue,에 추가되기 때문에 당신은 비 메인 스레드에서 요청을 시작하고있다.

그러나 작업을 큐에 추가 한 후 완료 블록을 호출하는 것이 문제입니다. 다음 코드를 제거하십시오 :

if ([NSThread isMainThread] ==YES) { 
    completionBlock(); 
} 
else{ 
    dispatch_sync(dispatch_get_main_queue(),completionBlock); 
}