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對於塊和GCD，我一直很緊張，因爲我的大腦告訴我它看起來非常複雜！EXC_BAD_ACCESS在塊內創建的對象
我得到一個塊，最好看起來好了給我的內心崩潰：
#pragma mark -
-(void)fetchOrdersListWithInfoDict:(NSDictionary*)infoDict completionBlock:(CompletionBlock)completionBlock errorBlock:(ErrorBlock)errorBlock
{
__weak VTVehicleServiceNetworkManager *weakSelf = self;
TaskBlock fetchOrdersListTaskBlock = ^()
{
__block __strong HLOrdersDataProvider *ordersDataProvider = nil;
NSBlockOperation *fetchOrdersOperation = [NSBlockOperation blockOperationWithBlock:[^{
ordersDataProvider = [[HLOrdersDataProvider alloc] init];
[ordersDataProvider performFetchOrdersListWithInfoDict:infoDict
completionBlock:completionBlock
errorBlock:errorBlock];
} copy]];
[weakSelf.dataOperationQueue addOperation:fetchOrdersOperation];
};
[self fetchDataWithTaskBlock:[fetchOrdersListTaskBlock copy]
errorBlock:^(NSError *error) {
errorBlock(error);
}];
}
我能夠描繪出殭屍對象，但我無法弄清楚這是爲什麼對象轉向了成爲殭屍。下面是從配置文件中的快照：
我已經通過了以下指南（1，2）去看看，如果我能找出我做錯了，但我沒有在附近發現什麼出錯了。
任何幫助和參考文字，我什麼做錯了將有所幫助。
編輯： 我已經試過什麼@Jerimy曾建議，事實上我的代碼，我剛纔發佈正是要求一樣：聲明和初始化ordersDataProvider塊操作本身裏面。但是，既然它在同一時刻崩潰了，我試圖在塊之外聲明它，看看它是否解決了崩潰。
下面是我測試的新代碼：
#pragma mark -
-(void)fetchOrdersListWithInfoDict:(NSDictionary*)infoDict completionBlock:(CompletionBlock)completionBlock errorBlock:(ErrorBlock)errorBlock
{
__weak VTVehicleServiceNetworkManager *weakSelf = self;
completionBlock = [completionBlock copy];
errorBlock = [errorBlock copy];
TaskBlock fetchOrdersListTaskBlock = ^()
{
NSBlockOperation *fetchOrdersOperation = [NSBlockOperation blockOperationWithBlock:^{
HLOrdersDataProvider *ordersDataProvider = [[HLOrdersDataProvider alloc] init];
[ordersDataProvider performFetchOrdersListWithInfoDict:infoDict
completionBlock:completionBlock
errorBlock:errorBlock];
}];
[weakSelf.dataOperationQueue addOperation:fetchOrdersOperation];
};
[self fetchDataWithTaskBlock:[fetchOrdersListTaskBlock copy]
errorBlock:^(NSError *error) {
errorBlock(error);
}];
}
從檔案崩潰：
沒有多少從堆棧跟蹤爲好，SDMHTTPRequest是一個圖書館和我非常肯定這裏沒有錯，HLOrdersDataProvider是我能夠在Instruments應用程序中找到的殭屍對象：
EDIT 2 添加更多細節的接口和實現的HLOrdersDataProvider：
@interface HLOrdersDataProvider : HLDataProvider
-(void)performFetchOrdersListWithInfoDict:(NSDictionary*)infoDict completionBlock:(CompletionBlock)completionBlock errorBlock:(ErrorBlock)errorBlock;
@end
@implementation HLOrdersDataProvider
-(void)performFetchOrdersListWithInfoDict:(NSDictionary*)infoDict completionBlock:(CompletionBlock)completionBlock errorBlock:(ErrorBlock)errorBlock
{
// Using SDMConnectivity
NSString *queryString = [infoDict valueForKey:@"$filter"];
NSString *appendStringForEndpoint = [kRowsetsKeyword stringByAppendingFormat:@"?%@", queryString];
[self fetchDataFromServerWithEndPointAppendString:appendStringForEndpoint
completionBlock:completionBlock
errorBlock:errorBlock];
}
#pragma mark - Service Agent related
-(NSString*)collectionName
{
return [NSString stringWithString:kRowsetsKeyword];
}
-(void)requestFinished:(SDMHttpRequest *)request
{
NSError *error = nil;
// Let's parse the response and send the results back to the caller
NSString *collectionName = [self collectionName];
NSData *responseData = [request responseData];
NSArray *entitiesArray = [self parseODataEntriesWithData:responseData
withCollectionName:collectionName
error:&error];
if (error)
[self triggerFailureBlockWithArgument:error];
else
[self triggerCompletionBlockWithArgument:entitiesArray];
}
@end
此外，HLOrdersDataProvider從HLDataProvider所以下面繼承是這個類的接口和實現過：
#import <Foundation/Foundation.h>
//#import "SDMHttpRequestDelegate.h"
#import "SDMRequestBuilder.h"
#import "SDMHttpRequest.h"
#import "SDMParser.h"
#import "HLConstant.h"
#import "HLConnectionData.h"
@interface HLDataProvider : NSObject <SDMHttpRequestDelegate>
@property (copy, atomic) CompletionBlock completionBlock;
@property (copy , atomic) ErrorBlock errorBlock;
@property (copy, atomic) CompletionBlockWithDataFetchStatus completionBlockWithDataFetchStatus;
+ (id)sharedInstance;
- (NSMutableArray*)parseODataEntriesWithData:(NSData*)data withCollectionName:(NSString*)collectionName;
- (NSMutableArray*)parseODataEntriesWithData:(NSData*)data withCollectionName:(NSString*)collectionName error:(NSError**)outError;
- (NSMutableArray*)parseJSONEntriesWithData:(NSData*)data;
-(NSArray*)fetchEntriesFromDatabaseWithEntityName:(NSString*)entityName relationshipObjects:(NSMutableArray*)relationships;
-(void)updateDatabaseWithEntries:(NSMutableArray*)scanEntries;
-(void)updateDatabaseWithJSONEntries:(NSMutableArray*)scanEntries;
-(id)parsedOdataResultFromEntries:(NSMutableArray*)entries;
-(void)fetchDataFromServerWithEndPointAppendString:(NSString*)appendStr completionBlock:(CompletionBlock)inCompletionBlock errorBlock:(ErrorBlock)inErrorBlock;
-(NSString*)collectionName;
-(void)triggerCompletionBlockWithArgument:(id)inArg;
-(void)triggerFailureBlockWithArgument:(NSError*)inArg;
@end
@implementation HLDataProvider
+ (id)sharedInstance
{
//Subclassess will override this method
return nil;
}
-(NSMutableArray*)parseODataEntriesWithData:(NSData*)data withCollectionName:(NSString*)collectionName
{
return [self parseODataEntriesWithData:data
withCollectionName:collectionName
error:NULL];
}
-(NSMutableArray*)parseODataEntriesWithData:(NSData*)data withCollectionName:(NSString*)collectionName error:(NSError**)outError
{
NSMutableArray *entriesArray = nil;
@try {
entriesArray = sdmParseODataEntriesXML(data,
[[[HLConnectionData metaDataDocument] getCollectionByName:collectionName] getEntitySchema],
[HLConnectionData serviceDocument]);
}
@catch (NSException *exception) {
NSLog(@"Got exception: %@", exception);
if (outError)
{
*outError = [NSError errorWithDomain:@"Vehicle Service"
code:-1001
userInfo:[NSDictionary dictionaryWithObject:exception forKey:NSLocalizedDescriptionKey]];
}
}
@finally {
}
return entriesArray;
}
- (NSMutableArray*)parseJSONEntriesWithData:(NSData*)data
{
NSError *error = nil;
id object = [NSJSONSerialization
JSONObjectWithData:data
options:0
error:&error];
NSMutableArray *resultArray = nil;
if(error) { /* JSON was malformed, act appropriately here */ }
if([object isKindOfClass:[NSDictionary class]])
{
resultArray = [NSMutableArray arrayWithObject:object];
}
else if ([object isKindOfClass:[NSArray class]])
{
resultArray = [NSMutableArray arrayWithArray:object];
}
return resultArray;
}
#pragma mark -
#pragma mark - Data Fetch - Server - SDMConnectivity
-(void)fetchDataFromServerWithEndPointAppendString:(NSString*)appendStr completionBlock:(CompletionBlock)inCompletionBlock errorBlock:(ErrorBlock)inErrorBlock;
{
self.errorBlock = inErrorBlock;
self.completionBlock = inCompletionBlock;
id<SDMRequesting> request = nil;
//NSString *clientStr = @"&sap-client=320&sap-language=EN";
NSString *urlStr =[NSString stringWithFormat:@"%@/%@",[HLConnectionData applicationEndPoint], appendStr];
urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
[SDMRequestBuilder setRequestType:HTTPRequestType];
request=[SDMRequestBuilder requestWithURL:[NSURL URLWithString:urlStr]];
[request setUsername:kUserName];
/*Set Password in SDMRequesting object*/
[request setPassword:kPassword];
[request setRequestMethod:@"GET"];
[request setTimeOutSeconds:kTimeoutInterval];
/*set the Delegate. This class must adhere to SDMHttpRequestDelegate to get the callback*/
[request setDelegate:self];
/*Call startAsynchronous API to request object to retreive Data asynchrnously in the call backs */
[request startSynchronous];
}
-(void)updateDatabaseWithEntries:(NSMutableArray*)scanEntries
{
//Subclasses will override this
}
-(void)updateDatabaseWithJSONEntries:(NSMutableArray*)scanEntries
{
//Subclasses will override this
}
-(id)parsedOdataResultFromEntries:(NSMutableArray*)entries
{
//Subclasses will override this
return nil;
}
-(void)deleteExistingEntriesFromCoredata
{
//Subclasses will override this
}
-(NSArray*)fetchEntriesFromDatabaseWithEntityName:(NSString*)entityName relationshipObjects:(NSMutableArray*)array
{
//Subclasses will overide this method
return nil;
}
#pragma mark - SDMHTTPRequestDelegate methods
- (void)requestStarted:(SDMHttpRequest*) request
{
}
- (void)requestFinished:(SDMHttpRequest*) request
{
// For service doc and metadata we instantiate HLDataProvider, so we send this raw SDMHTTPRequest object as-is. For other service agents like HLOrdersDataProvider we send the parsed information, check the subclass' implementation of -requestFinished: method
[self triggerCompletionBlockWithArgument:request];
}
-(void)triggerCompletionBlockWithArgument:(id)inArg
{
self.completionBlock(inArg);
}
- (void)requestFailed:(SDMHttpRequest*) request
{
[self triggerFailureBlockWithArgument:request.error];
}
-(void)triggerFailureBlockWithArgument:(NSError*)inArg
{
self.errorBlock(inArg);
}
- (void)requestRedirected:(SDMHttpRequest*) request
{
}
#pragma mark - Service Agent related
-(NSString*)collectionName
{
// Should be overridden by the subclasses
return nil;
}
帖子堆棧跟蹤。 – trojanfoe
@Raj在塊外的ordersDataProvider的任何特殊原因？爲什麼不只是把HLOrdersDataProvider * ordersDataProvider = [[HLOrdersDataProvider alloc] init];直接在塊內。 – Allen
對不起，延遲迴復，我有orderDataDataProvider塊以外因爲它崩潰時，我有它。一旦我重新開始工作，我會發布堆棧跟蹤。 –