RestKit最简单用法

安装RestKit，参考cocoapods的使用说明

1.

编辑.pch文件，加入：

#import <RestKit/RestKit.h>

2.

Model对象（Domain对象）

StatusItem.h

@interface StatusItem : NSObject
   @property (nonatomic, strong) NSString *name;
   @property (nonatomic, strong) NSString *itemDescription;
   @property (nonatomic, strong) NSString *timestamp;
   @property (nonatomic, strong) NSString *eventMessage;
   @property (nonatomic, strong) NSString *statusName;
   @property (nonatomic, strong) NSString *imageUrl;
@end

StatusItem.m

@implementation StatusItem

- (NSString *)description
{
    return [NSString stringWithFormat:@"%@ - %@",self.name, self.eventMessage];
}

@end

3.

利用RestKit动态获取WebService的返回数据，并根据映射关系转化成本地Model对象。

- (void)refresh
{
    // Setup the object mapping
    RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[StatusItem class]];
    // From JSON -> To property
    [mapping addAttributeMappingsFromDictionary:@{
                                                  @"name"                       : @"name",
                                                  @"description"                : @"itemDescription",
                                                  @"current-event.status.name"  : @"statusName",
                                                  @"current-event.status.image" : @"imageUrl",
                                                  @"current-event.timestamp"    : @"timestamp",
                                                  @"current-event.message"      : @"eventMessage",
                                                  }];
    
    // Define the response mapping
    // Map response with any status code in 2xx
    NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful);
    RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor
                                                responseDescriptorWithMapping:mapping
                                                method:RKRequestMethodAny
                                                pathPattern:@"/api/v1/services"
                                                keyPath:@"services"
                                                statusCodes:statusCodes];
    
    // Prepare the request operation
    NSURLRequest *request = [NSURLRequest requestWithURL:
                             [NSURL URLWithString:@"http://status.twilio.com/api/v1/services"]];
    RKObjectRequestOperation *operation = [[RKObjectRequestOperation alloc] initWithRequest:request
                                                                        responseDescriptors:@[responseDescriptor]];
    
    // Set on completion and on error blocks
    [operation
     setCompletionBlockWithSuccess:^(RKObjectRequestOperation
                                     *operation, RKMappingResult *result)
     {
         NSLog(@"Loaded items: %@", [result array]);
     }
     failure:^(RKObjectRequestOperation
               *operation, NSError *error)
     {
         NSLog(@"Failed with error: %@", [error localizedDescription]);
     }];
    [operation start]; //Fire the request
}