在表视图中使用字典数组帮助

本文介绍了在表视图中使用字典数组帮助的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

这有点令人困惑，所以请忍受我.

This is kinda confusing so please bear with me.

我有一个字典数组(listOfStates).其中listOfStates具有以下结构:

I have an array (listOfStates) of dictionaries. Where listOfStates has this structure:

{stateName} - {stateCapital} {Alabama} - {Montgomery} {Alaska} - {Juneau} {Arizona} - {Phoenix} ... {West Virginia} - {Charleston} {Wisconsin} - {Madison} {Wyoming} - {Cheyenne}

这是用于获取每个美国州(州名)的第一个字母以便将它们按字母顺序组合在一起的代码:

This is the code used to obtain the 1st letter of each US State(stateName) in order to group them together alphabetically:

listOfStates = [[NSArray alloc] init]; stateIndex = [[NSMutableArray alloc] init]; NSMutableArray *tempArray = [[NSMutableArray alloc] init]; for (NSDictionary *row in listOfStates) { [tempArray addObject:[row valueForKey:@"stateName"]]; for (int i=0; i<[tempArray count]-1; i++){ char alphabet = [[tempArray objectAtIndex:i] characterAtIndex:0]; NSString *uniChar = [NSString stringWithFormat:@"%C", alphabet]; if (![stateIndex containsObject:uniChar]){ [stateIndex addObject:uniChar]; } } }

该代码可以很好地工作，但是我在使用NSPredicate来理解如何使用 BOTH 的@"stateName"和@"stateCapital"(作为字幕)填充表格视图单元时遇到了问题对数组进行排序.

That code works beautifully, however I'm having issues understanding how to populate a tableview cell with BOTH the @"stateName" and @"stateCapital"(as the subtitle) after I use NSPredicate to sort the array.

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease]; } //---get the letter in the current section--- NSString *alphabet = [stateIndex objectAtIndex:[indexPath section]]; //---get all states beginning with the letter--- NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", alphabet]; NSArray *states = [[listOfStates valueForKey:@"stateName"] filteredArrayUsingPredicate:predicate]; //---extract the relevant state from the states object--- cell.textLabel.text = [states objectAtIndex:indexPath.row]; //cell.textLabel.text = [[listOfStates objectAtIndex:indexPath.row] objectForKey:@"stateName"]; //cell.detailTextLabel.text = [[listOfStates objectAtIndex:indexPath.row] objectForKey:@"stateCapital"]; return cell; }

感谢您的帮助，如果您认为这会帮助您理解，我将非常乐意发送整个项目.

Any help is appreciated and I am more than willing to send the entire project, if you think it'll help you understand.

非常感谢.

推荐答案

也许更改数据结构，以便您拥有一本以州名作为关键字，以州大写字母作为值的字典.这样，您可以对键进行排序并使用键而不是索引来获取值.

Maybe change the data structure so you have one dictionary with state name as a key and state capital as a value. That way you can sort your keys and get the value using the keys, not indexes.