带有JSON帮助的UITableView [英] UITableView with JSON help

问题描述

我正在尝试将一些JSON数据提供给我的iPhone应用程序，由于NSLog告诉我，数据可以正常使用.

I am trying to feed in some JSON data to my iPhone app, the data is coming in fine as I have NSLog's telling me so.

我遇到的问题是试图使结果显示在UITableView中.我在标签栏控制器下面有一个导航控制器，该导航控制器包含一个表视图控制器，该控制器加载另一个NIB文件，并将另一个表视图连接到一个类，该类是委托和数据源委托.

The problem I am having is trying to get the results to show in a UITableView. I have a navigation controller underneath a tab bar controller, the navigation controller contains a table view controller which loads another NIB file with a table view connected to a class which is the delegate and data source delegate.

我还需要将结果分为几部分-这些是

I also need to categorize the results into sections - these being

• 英国
• 苏格兰
• 威尔士
• 爱尔兰北部

要了解我使用的是什么JSON字符串，请请参阅此.

To get an idea of what JSON string I am using see this one.

您可以看到JSON不能满足各节的要求，但是我还没有实现，所以我需要事先知道，这样以后就不必修改太多代码了.

As you can see the JSON does not cater for the sections but I am yet to implement this, so i would need to know beforehand so I do not have to amend much code later on.

确定-我正在使用Stig JSON解析器.

这是我的ListVenuesView.h(已连接到表格视图)

Here is my ListVenuesView.h (connected to table view)

#import <UIKit/UIKit.h>
#import "SBJson.h"

@interface ListVenuesView : UITableViewController <UITableViewDelegate, UITableViewDataSource> {
    IBOutlet UITableView *venueList;
    NSMutableDictionary *jsonArray;
}

@property (nonatomic, retain) IBOutlet UITableView *venueList;
@property (nonatomic, retain) NSMutableDictionary *jsonArray;

@end

jsonArray用于存储JSON数据，并最终存储适当的数组.

jsonArray is used to store the JSON data and eventually the proper array.

这是我的ListVenuesView.m(有问题的关键区域)

And here is my ListVenuesView.m (key areas in question)

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSLog(@"Table View Loaded");

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;

    // This is where we load the JSON data

    NSURL *jsonURL = [NSURL URLWithString:@"http://www.thebigfishexperience.org.uk/sources/ajax/venue-json.php?location=peterborough"];

    NSString *jsonData = [[NSString alloc] initWithContentsOfURL:jsonURL];
    NSLog(@"%@", jsonData);

    // Convert jsonData to array
    self.jsonArray = [jsonData JSONValue];
    NSLog(@"%@", jsonArray);

    NSLog(@"count is: %i", [self.jsonArray count]);

    // Release NSString and NSURL
    [jsonURL release];
    [jsonData release];

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [self.jsonArray count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

    NSMutableDictionary *dict = [self.jsonArray objectAtIndex: indexPath.row];

    cell.textLabel.font = [UIFont fontWithName:@"Arial" size:15.0];

    cell.textLabel.text = [dict objectForKey:@"venueName"];
    cell.detailTextLabel.text = [dict objectForKey:@"venueCordDist"];
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    // Configure the cell...

    return cell;

此外，我该如何使用单元格中的数据转到导航控制器的另一个子视图，该子视图为我提供了一个后退按钮，并显示JSON字符串中仅针对已点击的特定单元格的信息.

Also how can I use the data in the cells to go to another subview of the nav controller which gives me a back button and displays the info from the JSON string just for that particular cell that has been tapped.

我认为这与它有关吗?不确定，因为这是我正在构建的第一个应用程序！因此，可能希望得到更多的援助请求-哈！ ;)

I think this has something to do with it? Not sure though as this is my first app i am building! So probably expect more pleas of assistance - ha ! ;)

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"Nib name" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     [detailViewController release];
     */
}

推荐答案

如u所提到的，在选择一行时，我们将导航到另一个视图.让我们假设视图控制器是DetailViewController，它是UIViewController的子类.

On selecting a row, as mentioned by u, we are navigating to another view. Let us assume that the view controller is DetailViewController which is a sub-class of UIViewController.

在DetailViewController.h中，声明一个NSDictionary对象.

In the DetailViewController.h , declare a NSDictionary object.

在DetailViewController.m中，添加

In DetailViewController.m, add

-(void)setVenueDict:(NSDictionary*)venueDict
{
    if( _venueDict )
    {
      [_venueDict release];
    }
    _venueDict = [venueDict retain];

}

在ParentViewController中，您的didSelectRow ..方法应如下所示.

In ParentViewController, ur didSelectRow.. method should be like this.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.

     DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"Nib name" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     NSDictionary *dict = [self.jsonArray objectAtIndex: indexPath.row];
     [detailViewController setVenueDict:dict];
     detailViewController.title = [dict objectForKey:@"venueName"];
     [self.navigationController pushViewController:detailViewController animated:YES];
     [detailViewController release];

}

在第二个视图控制器中，您可以使用_venueDict做任何您想做的事情.

In the second view controller, u can do whatever u want with the _venueDict.

这篇关于带有JSON帮助的UITableView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！