Techfest 2013 No RESTKit for the Weary

or the Weary
No RestKit f
Matt Galloway
Architactile
matt@architactile.com
918-808-3072

Tuesday, January 28, 14

Some
Amazingly
Cool Data
from the
“Cloud”

ul* Web
RESTF es
Servic

the “Cloud”

REST-ish and JSONy.
ul,“ of course, I mean
* By “RESTF

rvice Calls on iOS
Web Se
Define your URL
NSString *url = @”http://somewebservice.com/objects.json”;

Make the Call
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];

ese delegate methods!!!
Then implement all of th
-

(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
(void)connectionDidFinishLoading:(NSURLConnection *)connection

and now you have to parse
the JSON in NSData
into something useful...

n is great, but...
NSJSONSerializatio
-(void) parseJSONIntoModel:(NSData *) jsonData {
NSError *error = nil;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData
options:NSJSONReadingAllowFragments
error:&error];
if (error!=nil) {
// TODO: Insert annoying JSON error handler here.
}
if ([json isKindOfClass:[NSArray class]]) {
//TODO: Uh. I was expecting a dictionary but apparently this is an array. Writng some handling code here.
}
for(NSString *key in [json allKeys]) {
if ([key isEqualToString:@"user"]) {
NSDictionary *userDictionary = [json objectForKey:key];
NSNumber *userId = [userDictionary objectForKey:@"id"];
RKGUser *user = [[ObjectFactory sharedFactory] userForUserId:userId];
if (user==nil) {
user = [[ObjectFactory sharedFactory] newUser];
user.userId=useriD;
}

}
.
.
.

user.name = [userDictionary objectForKey:@"name"];
user.username = [userDictionary objectForKey:@"username"];
user.phone = [userDictionary objectForKey:@"phone"];
user.email = [userDictionary objectForKey:@"email"];


nter RestKit
E
https://github.com/RestK
it

/RestKit/

ing and modeling
ework for consum
RestKit is a fram
s on iOS and OS X
Tful web resource
RES


[[RKObjectManager sharedManager] getObjectsAtPath:@"objects.json"
parameters:nil
success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
// Call is successful. Objects are all populated.
}
failure:^(RKObjectRequestOperation *operation, NSError *error) {
// Call failed.
}];


RestKit is...
rce & available on GitHub
* Open Sou
* Built on AFNetworking
Beautifully multi-threaded
*
eamlessly with CoreData
* Integrates s
o works with plain objects
* Als
lationships, nesting, etc.
* Handles re
on mapping like an ORM
* Based
* Very configurable
, POST, PATCH, etc.
ndles all REST verbs - GET
* Ha
y actively maintained
* Ver
ase seeding, search,
ch of other stuff - datab
* A bu n
XML, etc.

ing RestKit
Install
I <3 CocoaPods
$ cd /path/to/MyProject
$ touch Podfile
$ edit Podfile
platform :ios, '5.0'
# Or platform :osx, '10.7'
pod 'RestKit', '~> 0.20.0'
$ pod install
$ open MyProject.xcworkspace


Using RestKit: The W
e


b Service

Using RestKit: The Object
@interface Joke : NSObject
@property (nonatomic, strong) NSNumber *jokeId;
@property (nonatomic, strong) NSString *text;
@end
@implementation Joke
@end


Using RestKit: The Setup
-(void) setupRestKit {
RKObjectManager *objectManager =
[RKObjectManager managerWithBaseURL:[NSURL URLWithString:@"http://api.icndb.com/"]];
objectManager.requestSerializationMIMEType=RKMIMETypeJSON;
[RKObjectManager setSharedManager:objectManager];
.
.
.

eps for CoreData, authentication, etc.)
(There are a few extra st


Using RestKit: The Mappin
g
RKObjectMapping *jokeMapping = [RKObjectMapping mappingForClass:[Joke class]];
[jokeMapping addAttributeMappingsFromDictionary:@{
@"id":
@"joke":

@"jokeId",
@"text"}];

RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor
responseDescriptorWithMapping:jokeMapping
method:RKRequestMethodGET
pathPattern:@"jokes"
keyPath:@"value"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

[[RKObjectManager sharedManager] addResponseDescriptor:responseDescriptor];


I <3 Singletons

a singleton, so
KObjectManager is
R
apping steps need
the setup and m
e, usually at app
only be done onc
launch.
it and forget it. :)
Se t


Using RestKit: The Call
[[RKObjectManager sharedManager] getObjectsAtPath:@"jokes"
parameters:nil
success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
self.jokes = mappingResult.array;
[self.tableView reloadData];
}
failure:^(RKObjectRequestOperation *operation, NSError *error) {
[self displayError:error];
}];

RKMappingResult has
count,firstObject, array,
dictionary,
and set properties

Using RestKit: The Mappin
gf

or POST

RKObjectMapping *inverseJokeMapping = [jokeMapping inverseMapping];
RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor
requestDescriptorWithMapping:inverseJokeMapping
objectClass:[Joke class]
rootKeyPath:@"jokes"
method:RKRequestMethodPOST ];
[[RKObjectManager sharedManager] addRequestDescriptor:requestDescriptor];


it: POSTing
Using RestK
Joke *aJoke=[[Joke alloc] init];
aJoke.jokeId=@9999;
aJoke.text=@"Chuck Norris can find the end of a circle.";
[[RKObjectManager sharedManager] postObject:aJoke
path:@"jokes"
parameters:nil
success:^(RKObjectRequestOperation *operation,
RKMappingResult *mappingResult){}
failure:^(RKObjectRequestOperation *operation,
NSError *error){}];


ome Demos
S


Matt Galloway
Architactile
matt@architactile.com
918-808-3072


Techfest 2013 No RESTKit for the Weary

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