singleton class for webservices in ios - ios

Question

I'm new to iOS while I'm developing I am calling web services every where...I want like one single class for get,post,put methods...then call [self post];
[parameters:....]... that means I want to call single methods for all get services and post.. please help me...how it is..
NSURL *url = [NSURL URLWithString:#"https://example.com/"];
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];
NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
height, #"user[height]",
weight, #"user[weight]",
nil];
[httpClient postPath:#"/myobject" parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSString *responseStr = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];
NSLog(#"Request Successful, response '%#'", responseStr);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"[HTTPClient Error]: %#", error.localizedDescription);
}];
For AFNetworking 2.0 (and also using the new NSDictionary syntax):
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *params = #{#"user[height]": height,
#"user[weight]": weight};
[manager POST:#"https://example.com/myobject" parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"JSON: %#", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", error);
}];

Answer 1

From here you can create singleton class - How to create singleton class in objective C
Then you need to create your own method with completion handler and call where you want.
Example: Post Method:
+(void)postWebserviceWithURL:(NSString*)webServiceURL withParam:(NSDictionary*)urlParameters withCompletion:(void(^)(NSDictionary*response))completion {
//Your code goes here
}

Answer 2

here is the related answer.You should create nsobject classes something like webservices and create the singleton instance object like this.
+(WebServices *)sharedInstance{
/* Use this to make it a singleton class */
if (sharedObj==Nil) {
sharedObj=[[WebServices alloc]init];
}
return sharedObj;
/**/
}
using this singleton instance you can call the methods what ever you required.
Eg: [[webservices sharedInstance] post];
With in the method you can use the required web services hits such as post,get and put.
use the Nsnotifiers to consume the responses from the API hits.

Answer 3

+ (instancetype)sharedInstance
{
static CustomClass *sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
//Override your constructor for custom initialization if you want
sharedInstance = [[CustomClass alloc] init];
});
return sharedInstance;
}
Then define your methods for CRUD actions.
simply access like
[[CustomClass sharedInstance] POST:...];
[[CustomClass sharedInstance] GET:...];