iOS-未将对象添加到数组中

我不明白为什么没有将附件添加到数组

filteredAttachments

？

dataAttachment

是具有附件的附件，我想在其中搜索具有特定名称的附件，然后搜索与要添加的附件相匹配的附件

.h:

@property (nonatomic, strong) NSMutableArray * dataAttachments;

@property (nonatomic, strong) NSMutableArray * filteredAttachments;

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {

  self.filteredAttachments = [NSMutableArray new];

  [self.dataAttachments enumerateObjectsUsingBlock:^(Attachment *attachment, NSUInteger index, BOOL *stop) {

    if ([attachment.name containsString:self.searchBarFiltern.text]) {

      [self.filteredAttachments addObject:attachment];

    }
  }];

  [self.tableView reloadData];
}

.m:

@property (nonatomic, strong) NSMutableArray * dataAttachments;

@property (nonatomic, strong) NSMutableArray * filteredAttachments;

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {

  self.filteredAttachments = [NSMutableArray new];

  [self.dataAttachments enumerateObjectsUsingBlock:^(Attachment *attachment, NSUInteger index, BOOL *stop) {

    if ([attachment.name containsString:self.searchBarFiltern.text]) {

      [self.filteredAttachments addObject:attachment];

    }
  }];

  [self.tableView reloadData];
}

---

首先，初始化self.dataAttachments数组

self.dataAttachments = [NSMutableArray array]:

---

然后检查self.dataAttachments数组的输出是空还是满。

containssString:方法仅在iOS 8中添加。 如果你想让你的代码在iOS 7和iOS 8上运行，你应该使用一个rangeOfString调用。基本上，如果返回的范围长度为零，则子字符串不存在

if([string1 rangeOfString:string2].length >0)
{
  // found
}

---

您确定

self.dataAttachments！=nil

？解释@trojanfoe的答案：您是否分配了ed+init ed

self.dataAttachments

？同时检查

filteredAttachments

Yes的相同项。我敢肯定。我正在用另一种方法（lldb）po self.dataAttachments.count 3OK cool向它添加附件。现在，您是否确定筛选文本包含在一个或多个名称中（包括确切的字母大小写）？谢谢。显然，问题是我在做self.filteredAttachments=[NSMutableArray new]；在错误的地方。