不能保留NSMutableArray对象（我正在使用ARC）

Question

我试图显示在表格视图中的Twitter应用搜索字段中搜索的关键字以及为此搜索返回的推文数量。 从主ViewController，我试图以编程方式创建另一个表视图。每当我将一个对象添加到NSMutableArray（我想要显示的表的数据）时，该对象就会存储在其中，但对于下一个函数调用，该数组不会保留其值。由于我使用ARC，因此我无法使用“保留”和“释放”语句。

我该如何解决这个问题？

请帮忙。

@interface AppViewController : UIViewController <UITableViewDataSource,UITableViewDelegate> 

@property (strong,nonatomic) NSMutableArray *searchWords; 
@property (strong,nonatomic) NSMutableArray *searchCount; 
@property (strong,nonatomic) NSString *count; 
@property (strong,nonatomic) UITableView *historyTable; 


@property (strong, nonatomic) IBOutlet UITextField *searchTextField; 
- (IBAction)showHistory:(id)sender; 

@end 

@implementation TwitterSearchViewController 
@synthesize searchTextField; 

@synthesize searchCount,searchWords,count,historyTable; 

- (void)viewDidLoad 
{ 

    count=[[NSString alloc] init]; 
    searchWords=[[NSMutableArray alloc] init]; 
    searchCount=[[NSMutableArray alloc] init]; 
    historyTable=[[UITableView alloc] init]; 

    [super viewDidLoad]; 
} 

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{ 
    if ([[segue identifier] isEqualToString:@"transitionToSearchResults"]) 
    { 
     NSLog(@"Count of searchWords before:%lu",(unsigned long)[searchCount count]); 
     //This prints 0 every time 

     [searchWords addObject:[searchTextField text]]; 

     NSLog(@"Count of searchWords:%lu",(unsigned long)[searchWords count]); 
     //This prints 1 every time    


     TWRequest *requestError = [[TWRequest alloc] initWithURL:[NSURL URLWithString:searchURL] parameters:nil requestMethod:TWRequestMethodGET]; 
     //searchURL is used to get the tweets using Twitter API 

     // Send the Twitter Search request and create a handler to handle the Search response 
     [requestError performRequestWithHandler:^(NSData *searchResponse, NSHTTPURLResponse *requestResponse, NSError *error) 
     { 

       // Extract the Twitter messages from search response 
       NSArray *tweetMessages = [searchResultsDict objectForKey:@"results"]; 

       // Set the Data Source for the Table in TwitterSearchResultsViewController 
       // which displays the search results nicely 
       [searchViewController setTweetMessages:tweetMessages]; 
       // Update the table view 
       [searchViewController updateTableView]; 
       count=[[NSString alloc] initWithFormat:@"%lu",(unsigned long)[tweetMessages count]]; 

      } 
     }]; 
     [searchCount addObject:count]; 
    } 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ 
    return [searchWords count]; 
} 

-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView{ 
    return 1; 
} 

// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier: 
// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls) 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ 
    NSString *[email protected]"HistoryCell"; 
    UITableViewCell *newCell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier]; 
    if(newCell==nil){ 
     newCell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue2 reuseIdentifier:cellIdentifier]; 
    } 

    [[newCell textLabel] setText:[searchWords objectAtIndex:[indexPath row]]]; 
    [[newCell detailTextLabel] setText:[searchCount objectAtIndex:[indexPath row]]]; 

    return newCell; 


} 

- (IBAction)showHistory:(id)sender { 
    //historyTable=[[UITableView alloc] init]; 
    historyTable.dataSource=self; 
    historyTable.delegate=self; 
    NSLog(@"Histroy count:%ld",(long)[historyTable numberOfRowsInSection:0]); 
    //Since the mutable arrays are not retaining their values, the number of rows in my  table is always zero 
    self.view=historyTable; 
    [email protected]"Search History"; 
} 
@end 

Answer 1

把你的[searchCount addObject:count];代码在caliculated count之后。

[requestError performRequestWithHandler:^(NSData *searchResponse, NSHTTPURLResponse *requestResponse, NSError *error) 
      { 

        // Extract the Twitter messages from search response 
        NSArray *tweetMessages = [searchResultsDict objectForKey:@"results"]; 

        // Set the Data Source for the Table in TwitterSearchResultsViewController 
        // which displays the search results nicely 
        [searchViewController setTweetMessages:tweetMessages]; 
        // Update the table view 
        [searchViewController updateTableView]; 
        count=[[NSString alloc] initWithFormat:@"%lu",(unsigned long)[tweetMessages count]]; 

        [searchCount addObject:count]; 
       } 
      }];