NSMutableArray仅添加最后一个对象

Question

我首先允许描述该方案。我有一个名为“exibitors” 的数组，其中包含所有exibitors信息（所有数组信息都从URL中解析出来）。 目前它有“107”Fair01项目（fairId = Fair01）&“2”Fair02项目 （fairId = Fair02）。现在我想运行一个返回数组的方法。 在这种方法中，我将通过使用当前ViewController的“FairIdPassing”检查它们来选择Fair01或Fair02，并将当前的“FairId” 相应数据添加到名为“exibitorsWithFairIdComplete”的此方法数组中。

这里是方法：

-(NSMutableArray *) getFairInfoArray:(NSString *)FairIdForThisMethod From:(NSMutableArray*)exibitorsForThisMethod 
{ 
ExibitorInfo *currentExibitors2=[[ExibitorInfo alloc] init]; 
exibitorsWithFairId = [[NSMutableArray alloc] init]; 

// "FairIdHolderCount" = how many fairId is there, in the list 
int FairIdHolderCount = [exibitorsForThisMethod count]; 

for (int i=0; i<FairIdHolderCount; i++) 
{ 
    ExibitorInfo *currentExibitors1=[[ExibitorInfo alloc] init]; 
    currentExibitors1 = [exibitorsForThisMethod objectAtIndex:i]; 

    if ([currentExibitors1.FairId isEqualToString:FairIdForThisMethod]) 
    { 
     [currentExibitors2 setExibitorName:currentExibitors1.exibitorName]; 
     [currentExibitors2 setStallLocation:currentExibitors1.stallLocation]; 
     [currentExibitors2 setExibitorCellBackGround:currentExibitors1.exibitorCellBackGround]; 
     [currentExibitors2 setCompanyLogoURL:currentExibitors1.companyLogoURL]; 

    [exibitorsWithFairId addObject:currentExibitors2]; 
    } 
} 
    return exibitorsWithFairId; 
} 

我打电话的方法“的tableView numberOfRowsInSection：”因为我想 显示在一个表视图。该代码是：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    // call the method 
    exibitorsWithFairIdComplete = [self getFairInfoArray:FairIdPassing From:exibitors]; 
    return [self.exibitorsWithFairIdComplete count]; 
} 

但问题是，当我调用该方法，并希望通过一个特定FairId添加对象 数组中的一个，它只是增加了最后一个值。 并显示其相应信息。

例子：

For Fair02 ----> "exibitors" array contain 2 "Fair02" elements besides 107 "Fair01": 

(in array) 
fair id : Fair02, fairName : A, Location: A 
fair id : Fair02, fairName : B, Location: B 


(fair id : Fair01, fairName : X, Location: X 
fair id : Fair01, fairName : Y, Location: Y 
fair id : Fair01, fairName : Z, Location: Z 
....... 
....... 
....... 
....... 
....... 
total 107) 

调用此方法只打印最后的 “B” 相关拖表行 信息后， 像：

"fair id : Fair02, fairName : B, Location: B" 
"fair id : Fair02, fairName : B, Location: B" 

当我要显示所有fairInfo一个

一个。 像：

fair id : Fair02, fairName : A, Location: A 
fair id : Fair02, fairName : B, Location: B 

我不能指出在addingObject错误发生的MutableArray。 请问我，如果我不明确这个帖子给你。如果有任何一位 熟悉这个问题，请让我知道。

Answer 1

这应该使您的业务：

-(NSMutableArray *) getFairInfoArray:(NSString *)FairIdForThisMethod From:(NSMutableArray*)exibitorsForThisMethod { 
    NSMutableArray *exibitorsWithFairId = [[NSMutableArray alloc] init]; 
    // "FairIdHolderCount" = how many fairId is there, in the list 
    int FairIdHolderCount = [exibitorsForThisMethod count]; 

    for (ExibitorInfo *currentExibitors1 in exibitorsForThisMethod) { 
     if ([currentExibitors1.FairId isEqualToString:FairIdForThisMethod]) { 
      ExibitorInfo *currentExibitors2=[[[ExibitorInfo alloc] init] autorelease]; 

      [currentExibitors2 setExibitorName:currentExibitors1.exibitorName]; 
      [currentExibitors2 setStallLocation:currentExibitors1.stallLocation]; 
      [currentExibitors2 setExibitorCellBackGround:currentExibitors1.exibitorCellBackGround]; 
      [currentExibitors2 setCompanyLogoURL:currentExibitors1.companyLogoURL]; 

      [exibitorsWithFairId addObject:currentExibitors2]; 
     } 
    } 

    return exibitorsWithFairId; 
} 

你被分配一个ExibitorInfo对象，然后把它扔出去，访问对象的数组中，然后变异currentExibitors2和数组中插入。但是由于插入没有复制，你实际上正在改变和一次又一次地插入同一个对象。

Answer 2

尝试这样：

- (NSMutableArray*) getFairInfoArray: (NSString*) FairIdForThisMethod From: (NSMutableArray*) exibitorsForThisMethod 
{ 
    NSMutableArray* exibitorsWithFairId = [[NSMutableArray alloc] init]; 

    for (ExibitorInfo* currentExibitors1 in exibitorsForThisMethod) 
    { 
     if ([currentExibitors1.FairId isEqualToString: FairIdForThisMethod]) 
     { 
      ExibitorInfo* currentExibitors2 = [[ExibitorInfo alloc] init]; 
      [currentExibitors2 setExibitorName:currentExibitors1.exibitorName]; 
      [currentExibitors2 setStallLocation:currentExibitors1.stallLocation]; 
      [currentExibitors2 setExibitorCellBackGround:currentExibitors1.exibitorCellBackGround]; 
      [currentExibitors2 setCompanyLogoURL:currentExibitors1.companyLogoURL]; 

      [exibitorsWithFairId addObject:currentExibitors2]; 
     } 
    } 

    return exibitorsWithFairId; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    self.exibitorsWithFairIdComplete = [self getFairInfoArray: FairIdPassing 
                 From: exibitors]; 

    return [self.exibitorsWithFairIdComplete count]; 
} 

希望它可以帮助你。