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POHow to properly implement a Services class into my iOS application?
 

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  1. POHow to properly implement a Services class into my iOS application?
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    <p>My current head scratcher: implementing a model class specifically for service calls to my rails application.</p> <p>Here is the scenario:</p> <ul> <li>I have a class named <strong>Service</strong> that is a subclass of NSObject.</li> <li>The implementation file has a few methods defined… lets look at <em>doSignUp</em>.</li> <li>I am using <strong>AFNetworking</strong> to communicate with the api.</li> <li>From my <strong>SignUpViewController</strong>, I create an instance of my <strong>Service</strong> class and call <em>doSignUp</em></li> <li>The method works, as expected and I receive the proper response from the server.</li> </ul> <p>Now Comes the part I don't fully understand:</p> <ul> <li><strong>AFNetworking</strong> utilizes blocks for its service calls.</li> <li>Inside the <em>success</em> block I call a helper method called <em>handleSignUp</em> (also in <strong>Service</strong> class). This method essentially parses the JSON and I create a new <strong>User</strong> (NSObject subclass) out of it. The <em>handSignUp</em> method then returns the <strong>User</strong> object.</li> </ul> <p>At this point I have a new <strong>User</strong> object and I need to send that object back to my <strong>SignUpViewController</strong>... How can I do that?</p> <ul> <li>Should I try to add that object to the <strong>AppDelegate</strong> and access it from the <strong>SignUpViewController</strong>? This solution could work to access various global properties but when would the <strong>SignUpViewController</strong> know when to access it?</li> <li>Should I try to add a reference to the <strong>SignUpViewController</strong> in the <strong>Service</strong> class? That seems counter productive... I might as well add the method <em>doSignUp</em> and <em>handSignUp</em> to the <strong>SignUpViewController</strong>. It seems to me like my <strong>Service</strong> class should not be aware of any other viewControllers.</li> </ul> <p>See below for my code examples:</p> <p>Service.h</p> <pre><code>//Service.h #import &lt;UIKit/UIKit.h&gt; #import "AFNetworking.h" @interface Services : NSObject - (void) doSignUp:(NSMutableDictionary*)params; @end </code></pre> <p>Service.m</p> <pre><code>// Service.m #import "Services.h" #import "Config.h" @implementation Services - (void) doSignUp:(NSMutableDictionary*)params { NSURL *url = [NSURL URLWithString:@"http://MYURL.COM"]; AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url]; NSURLRequest *request = [httpClient requestWithMethod:@"POST" path:@"signup.json" parameters:params]; AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) { [self handleSignUp:JSON]; } failure:nil]; [operation start]; } - (User*) handleSignUp:(NSMutableArray*)json { User * user = nil; if ([[json valueForKey:@"success"] isEqualToString:@"true"]) { // create user here ... } return user; } </code></pre> <p>SignUpViewController.h</p> <pre><code>#import "Service.h" @interface SignUpViewController : UIViewController { Service * service; } @property (nonatomic, strong) Service * service; </code></pre> <p>SignUpViewController.m</p> <pre><code>#import "SignUpViewController.h" @interface SignUpViewController () @end @implementation SignUpViewController @synthesize service = __service; - (IBAction) initSignUp:(id)sender { // create params... [self.service doSignUp:params]; } </code></pre> <p>Again, all this code does what it is supposed to do... I just need to know how it should all communicate. How can I alert the <strong>SignUpViewController</strong> the <em>handleSignUp</em> has been called and a new <strong>User</strong> object is available?</p> <p>Thanks for your time, Andre</p>
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