使用快速枚举或NSPredicate在数组中搜索(来自plist with dictionaries)

时间:2013-07-23 14:21:36

标签: ios arrays nspredicate fast-enumeration

我的应用程序从plist文件读取数据并在UITableView

中显示数据

我的plist示例:

<array>
<dict>
      <key>name</key>
      <string>One</string>
      <key>value</key>
      <string>1</string>
</dict>
<dict>
      <key>name</key>
      <string>Two</string>
      <key>value</key>
      <string>2</string>
</dict>
<dict>
      <key>name</key>
      <string>Three</string>
      <key>value</key>
      <string>3</string>
</dict>
<dict>
      <key>name</key>
      <string>Four</string>
      <key>value</key>
      <string>4</string>
</dict>
<dict>
      <key>name</key>
      <string>Five</string>
      <key>value</key>
      <string>5</string>
</dict>
<dict>
      <key>name</key>
      <string>Six</string>
      <key>value</key>
      <string>6</string>
</dict>
</array

现在一切正常。所有内容都显示在我的TableView中,并带有正确的详细单元格。 我在detailTextLabel中显示值,在TextLabel中显示名称。

if (isSearching==true) {
    cell.textLabel.text = [searchArray objectAtIndex:indexPath.row];
//How to include the key "value" from this non-dictionary Array?
    return cell;
}

cell.textLabel.text = [[mainArray objectAtIndex:indexPath.row] objectForKey:@"name"];
cell.detailTextLabel.text = [[mainArray objectAtIndex:indexPath.row] objectForKey:@"value"];

当然还有numbersOfRowsInSection:

if (isSearching) {
    return [searchArray count];
}
return [IDarray count];

我正在使用它从plist中获取数组:

NSMutableArray *mainArray = [[NSMutableArray alloc] initWithContentsOfFile:path-to-plist-file];

但后来我想添加一个UISearchBar来搜索我的数据(数组)。

我已经看过并阅读了教程,但我无法使用快速枚举或NSPredicate,更多替代方案?

因为我正在阅读带有许多词典的plist数据?

到目前为止,我测试了这个没有成功:

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
if (searchText.length==0) {
    isSearching = false;
}

else {
    isSearching=true;
    searchArray = [[NSArray alloc]init];

    NSPredicate *pre = [NSPredicate predicateWithFormat:@"SELF contains [search] %@", searchText];
    searchArray = [mainArray filteredArrayUsingPredicate:pre];
}
[tableView reloadData]; 
}

搜索时会显示“无结果”,有时会崩溃。

我也测试过:

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
if (searchText.length==0) {
    isSearching = false;
}

else {
    isSearching=true;
    searchArray = [[NSArray alloc]init];

    for (NSString *str in mainArray) {
        NSRange searchRange = [str rangeOfString:searchText options:NSCaseInsensitiveSearch];


        if (searchRange.location !=NSNotFound) {
            [searchArray addObject:str];
        }
}
[tableView reloadData]; 
}

不起作用......

如何实施搜索栏以搜索数据? 如何在搜索显示控制器中显示值和名称?

1 个答案:

答案 0 :(得分:1)

你在mainArray中有一系列词典。它不起作用:

for (NSString *str in mainArray)

尝试:

id mainArray = [[NSMutableArray alloc] initWithContentsOfFile:path-to-plist-file];
NSMutableArray *names = [mainArray valueForKey:@"name"];
NSMutableArray *values = [mainArray valueForKey:@"value"];

并寻找必要的数组