Question

我正在使用TouchJSON从http://enbr.co.cc/TrailsApp/shops.php检索JSON响应。在我的应用程序中，我使用此代码来处理网址方案。

- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url
{
    if (!url) {
        return NO;
    }
    NSString *urlString = [url absoluteString];
    NSString *urlStringDecoded = [urlString stringByReplacingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
    NSArray *list = [urlStringDecoded componentsSeparatedByString:@"="];
    NSString *urlPrefix = [list objectAtIndex:0];
    NSString *name = [list objectAtIndex:1];
    if ([urlPrefix isEqualToString:@"tridetrails://opentrail?name"]) {
        TrailViewController *trailViewController = [[TrailViewController alloc] initWithNibName:@"TrailViewController" bundle:[NSBundle mainBundle]];
        trailViewController.trailToGoto = name;
        [self.navigationController pushViewController:trailViewController animated:YES];
        [trailViewController release];
    }
    if ([urlPrefix isEqualToString:@"tridetrails://openshop?name"]) {
        ShopViewController *shopViewController = [[ShopViewController alloc] initWithNibName:@"ShopViewController" bundle:[NSBundle mainBundle]];
        shopViewController.shopToGoto = name;
        [self.navigationController pushViewController:shopViewController animated:YES];
        [shopViewController release];
    }
    return YES;
}

如何根据NSString名称将从JSON创建的NSDictionary中的正确条目推送到ShopViewController？这是我的字典由NSLog打印出来的NSLog（@“％@”，myObj）;.提前谢谢。

{
    shops =     (
                {
            blurb = "Bootdoctors blurb";
            image = bootdoctorslogo;
            locations = "Mountain Village";
            motto = "Bootdoctors shop motto";
            name = Bootdoctors;
        },
                {
            blurb = "Easy Rider blurb";
            image = easyriderlogo;
            locations = Telluride;
            motto = "Easy Rider shop motto";
            name = "Easy Rider";
        },
                {
            blurb = "Paragon Ski & Sport blurb";
            image = paragonskiandsportlogo;
            locations = Telluride;
            motto = "Paragon shop motto";
            name = "Paragon Ski & Sport";
        },
                {
            blurb = "Telluride Sports blurb";
            image = telluridesportslogo;
            locations = "Telluride and Mountain Village";
            motto = "Telluride Sports shop motto";
            name = "Telluride Sports";
        }
    );
}

Answer 1

您可能需要提供有关您尝试执行的操作的更多信息。例如，您没有说明如何检索包含所有商店详细信息的字典以及ShopViewController如何访问此字典。但是，从字典中选择一个名称的商店可以通过以下方式完成：

NSDictionary *jsonResponse; // You don't say how the ShopViewController has access to
                            // the response so let's just assume a local variable here.

NSDictionary *foundShop = nil; // This will be selected shop after the search below

NSArray *shops = [jsonResponse objectForKey:@'shops'];

for (NSDictionary *shop in shops) {
    if ([shop objectForKey:@'name'] isEqualToString:self.shopToGoto]) {
        foundShop = shop;
        break;
    }
}

if (foundShop) {
    // Do something with the dictionary keys and values in foundShop
}
else {
    // Error condition - shop with required name is not present
    // Handle error
}

Answer 2

您可以使用NSPredicate选择您要查找的商店：

    NSString* shopName = ...;

    NSArray* shops = ...;  // this is your JSON-produced array of NSDictionary Shop objects

    NSPredicate* predicate = [NSPredicate predicateWithFormat: @"name == '%@'", shopName ];

    NSArray* matchingShops = [shops filteredArrayUsingPredicate: predicate];

    NSDictionary* firstMatchingShop = [matchingShops objectAtIndex: 0];

使用NSDictionary中的url方案打开特定跟踪

2 个答案: