NSURL object, which is used to make an NSURLRequest.
2. AFHTTPRequestOperation is an all-in-one class for handling HTTP transfers across the network. You
tell it that the response should be read as JSON by setting the responseSerializer property to the
default JSON serializer. AFNetworking will then take care of parsing the JSON for you.
3. The success block runs when (surprise!) the request succeeds. The JSON serializer parses the received
data and returns a dictionary in the responseObject variable, which is stored in the weather property.
4. The failure block runs if something goes wrong – such as if networking isn’t available. If this happens,
you simply display an alert with the error message.
5. You must explicitly tell the operation to “start” (or else nothing will happen).
As you can see, AFNetworking is extremely simple to use. In just a few lines of code, you were able to create a
networking operation that both downloads and parses its response.
Now that the weather data is stored in self.weather, you need to display it. Find the
tableView:numberOfRowsInSection: method and replace it with the following:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:
(NSInteger)section
{
if(!self.weather)
return 0;
switch (section) {
case 0: {
return 1;
}
case 1: {
NSArray *upcomingWeather = [self.weather upcomingWeather];
return [upcomingWeather count];
}
default:
return 0;
}
}
The table view will have two sections: the first to display the current weather and the second to display the
upcoming weather.
“Wait a minute!”, you might be thinking. What is this [self.weather upcomingWeather]? If self.weather
is a plain old NSDictionary, how does it know what “upcomingWeather” is?
To make it easier to display the data, I added a couple of helper categories on NSDictionary in the starter
project:
NSDictionary+weather
NSDictionary+weather_package
These categories add some handy methods that make it a little easier to access the data elements. You want to
focus on the networking part and not on navigating NSDictionary keys, right?
Note: FYI, an alternative way to make working with JSON results a bit easier than looking up keys in
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