Question

说明

我有一个UITableView，每行都加载了Facebook好友json数据。用户将选择多个朋友，并且他们的选择内容将填写前一页上的标签，当＆＃34;完成＆＃34;按下按钮。

NSMutableArray *friends;
NSDictionary *friendsDict;
NSArray *selectedIndexes;


-viewDidLoad {

//Grab the data from Facebook and put it into an array

friends = [NSMutableArray arrayWithArray:jsonData[@"data"]];

}

-cellForRowAtIndexPath {   

friendsDict = friends[indexPath.row];

cell.textLabel.text = friendsDict[@"name"];

}

-doneButtonPushed {

selectedIndexes = [self.tableView indexPathsForSelectedRows];

//NOW WHAT?

}

问题：

我不清楚如何处理所选索引。我知道我订购的朋友名单在＆＃34; friendsDict＆＃34;字典，但我如何得到＆＃34; id＆＃34;来自词典中选定的朋友使用＆＃34; selectedIndexes＆＃34;阵列

我失败的尝试：

-doneButtonPushed {

selectedIndexes = [self.tableView indexPathsForSelectedRows];


//this does not work
NSMutableArray *friendsArray = [friends objectsAtIndexes:selectedIndexes];

}

我已经在这上面翻了两天头，这真的到了我脑袋里的椒盐脆饼。我不知道如何再考虑它。请帮助编码神！

Answer 1

您的代码的主要问题是NSArray方法objectsAtIndexes:采用NSIndexSet类型的参数，但UITableview的indexPathsForSelectedRows为您提供包含NSIndexPath对象的NSArray。以下是您使用NSArray的方法：

- doneButtonPushed
{
  selectedIndexes = [self.tableView indexPathsForSelectedRows];
  if (nil == selectedIndexes)
  {
    // No selection
    return;
  }

  // The documentation of indexPathsForSelectedRows talks about
  // "index-path objects" - by this it means that the objects
  // in the array have the type NSIndexPath
  for (NSIndexPath* indexPath in selectedIndexes)
  {
    // Here we get onto familiar ground :-)
    friendsDict = friends[indexPath.row];

    // I don't know the type of the "id" object, so I am just
    // using the generic type id in this example. This is just
    // a coincidence and has nothing to do with the key of
    // your dictionary being "id". If you know that the "id"
    // object is, for instance, an NSString, then change
    // the type of the variable friendId to NSString*.
    id friendId = friendsDict[@"id"];

    // Now do something with friendId ...
  }

iOS UITableView - 来自NSDictionary的多项选择

1 个答案: