iphone - 从 plist 中过滤 NSArry 的数据

Question

我想按城市过滤数据并将其打印到表格部分。我有这样的代码。

NSMutableArray *key1=[NSMutableArray arrayWithCapacity:count];
NSMutableArray *city=[NSMutableArray arrayWithCapacity:count];
NSMutableArray *name= [NSMutableArray arrayWithCapacity:count];
for(id key in data) {
    [key1 addObject:key];
}
for (int i=0;i<[key1 count]; i++) {
    NSLog(@"key:%@",[key1 objectAtIndex:i]);
}
for (int i=0;i<[key1 count]; i++) {
    NSDictionary *email_key=[data objectForKey:[key1 objectAtIndex:i]];
    [city addObject:[email_key objectForKey:@"city"]]; 
    [name addObject:[email_key objectForKey:@"f_name"]];
}

我有来自 plist 的城市数组。

我的 Plist 的内容：

<key>bh@gmail.com</key>
<dict>
    <key>fnmae</key><string>hello</string>
    <key>city</key><string>DElhi</string>
</dict>
<dict>
    <key>fnmae</key><string>hi</string>
    <key>city</key><string>Bombay</string>
</dict>

Answer 1

首先获取所有唯一城市的名称，如下所示：

NSMutableDictionary *cityBasedData=[[NSMutableDictionary alloc] init];
for(id key in data) {
    [key1 addObject:key];
}
for (int i=0;i<[key1 count]; i++) {
    NSDictionary *email_key=[data objectForKey:[key1 objectAtIndex:i]];
    if (![cityBasedData objectForKey:[email_key objectForKey:@"city"]]) {
     NSMutableArray *nameList = [[NSMutableArray alloc] init];
     [nameList addObject:[email_key objectForKey:@"f_name"]];
     [cityBasedData setValue:nameList forKey:[email_key objectForKey:@"city"]];
     [nameList release]; 
    }
    else
    {
      NSMutableArray *nameList = [cityBasedData objectForKey:[email_key objectForKey:@"city"]];
      [nameList addObject:[email_key objectForKey:@"f_name"]];
     [cityBasedData setValue:nameList forKey:[email_key objectForKey:@"city"]];
    }

}

得到这个字典后，可以遍历字典中的每个键，得到每个键的数组：

for(id key in cityBasedData)
{
   //get array as follows:
   NSArray *namelist = [cityBasedData objectForKey:key];
}