NSUserDefaults EXC_BAD_ACCESS

Question

由於「onlineLastUpdatedAt」，我收到錯誤消息「EXC_BAD_ACCESS」，我不明白爲什麼。這裏是我的代碼：

#define IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY @"iMonggoFetcher.ImonggoOnlineProductsLastUpdatedAt" 

- (void) saveLastUpdatedAtDate{ 
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
    NSMutableArray *onlineLastUpdatedAt = [[defaults objectForKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY] mutableCopy]; 
    NSString *onlineLastUpdatedAtValue = [iMonggoFetcher lastUpdatedAtDate]; 

    if (!onlineLastUpdatedAt) onlineLastUpdatedAt = [[NSMutableArray alloc]init]; 

    if([onlineLastUpdatedAt containsObject:onlineLastUpdatedAtValue]){ 
     NSLog(@"onlineLastUpdated at contains a value for onlineLastUpdatedatValue"); 
     //[defaults setObject:onlineLastUpdatedAt forKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY]; 

    }else{ 
     NSLog(@"!onlineLastUpdated at contains a value for onlineLastUpdatedatValue"); 

     [onlineLastUpdatedAt addObject:onlineLastUpdatedAt]; 
     NSLog(@"mutablearray: %@", onlineLastUpdatedAt); 
     [defaults setValue:onlineLastUpdatedAt forKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY]; 
     [defaults synchronize]; 
    } 
    NSLog(@"added to defaults: %@ ",onlineLastUpdatedAtValue); 
} 

Answer 1

你打電話setValue:ForKey:時您應該致電setObject:ForKey：

[defaults setValue:onlineLastUpdatedAt forKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY]; 

替換爲：

[defaults setObject:onlineLastUpdatedAt forKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY]; 

Answer 2

你不能直接輸入任何物體進入NSUserDefaults 首先你必須是對象轉換成NSData或NSMutableData 試試這個

NSData *dataVal = [NSKeyedArchiver archivedDataWithRootObject:onlineLastUpdatedAt]; 
[defaults setObject:dataVal forKey:IMONGGO_PRODUCTS_ONLINE_LAST_UPDATED_AT_KEY]; 
[defaults synchronize];