使用来自 NSDictionary 的 url 方案打开特定路径答案

【问题标题】：Open specific trail with a url scheme from NSDictionary使用来自 NSDictionary 的 url 方案打开特定路径
【发布时间】：2010-10-03 17:57:07
【问题描述】：

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 url 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 名称将正确的条目从由 JSON 创建的 NSDictionary 推送到 ShopViewController？这是 NSLog 用 NSLog(@"%@", myObj); 打印出来的我的字典。提前致谢。

{
    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";
        }
    );
}

【问题讨论】：

标签： iphone json url nsdictionary

【解决方案1】：

您可能需要提供更多有关您正在尝试做的事情的信息。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 如何访问该字典。但是从字典中按名称选择一家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
}

【讨论】：

【解决方案2】：

您可以使用 NSPredicate 来选择您正在寻找的商店：

    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];

【讨论】：