How to integrate rest API using NSURLConnection in iOS? - ios

Question

I have tried this methods, I want to know about integration of rest API in iOS.
I want to know about JSON parsing in web services. I know about these methods but how to use it? but what is function of each method?
This IBAction method sends request string for signup to the server .
-(void)genSignup
{
responseData = [NSMutableData data];
urlLoc= [urlLoc stringByAppendingString:service];
NSLog(#"%#",requestString);
NSData *postData = [requestString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%lu",(unsigned long)[postData length]];
request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:urlLoc]];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
//NSLog(#"%#",request);
PostConnectionRegisterGenUser = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[responseData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
[MyClass removePregressIndicator:self.view];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[MyClass removePregressIndicator:self.view];
if (connection == PostConnectionRegisterGenUser)
{
NSError *error;
NSDictionary *results = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
NSLog(#"%#",results);
}
}
how to use it?

Answer 1

NSURLConnection is deprecated effective Mac OS 10.11 and iOS 9. So, at this point NSURLSession should be used instead of NSURLConnection.
I just add NSURLSession in your code. Change Key, URL accordingly. I did not compile it.
NSString * requestString = [NSString stringWithFormat:#"Name=%#&Email=%#&Password=%#&MobileNumber=%#&BloodGroup=%#&DeviceID=%#&City=%#&DeviceType=I",txtName.text,txtEmail.text,txtPassword.text,txtMobileno.text,strBlood,strDeviceID,txtCity.text];
NSData *postData = [requestString dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%lu",(unsigned long)[postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:urlLoc]];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
sessionConfiguration.HTTPAdditionalHeaders = #{ #"api-key": #"API_KEY"};
NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration];
NSURLSessionDataTask *sessionPostDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
// The server answers with an error because it doesn't receive the params
}];
[sessionPostDataTask resume];
Do let me know if you need any other information.
Hope this will help you !!!

Answer 2

Use simple common methods for NSURLSession WS Calling.
-(void)callWebserviceWithParams:(NSDictionary *)aParams withURL:(NSString *)aStrURL withTarget:(UIViewController *)aVCObj withCompletionBlock:(void(^)(NSMutableDictionary *aMutDict))completionBlock withFailureBlock:(void(^)(NSError *error))failure
{
NSString *aStrParams = [self getFormDataStringWithDictParams:aParams];
NSData *aData = [aStrParams dataUsingEncoding:NSUTF8StringEncoding];
aStrURL = [aStrURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSMutableURLRequest *aRequest = [[NSMutableURLRequest alloc]initWithURL:[NSURL URLWithString:aStrURL]];
[aRequest setHTTPMethod:#"POST"];
[aRequest setHTTPBody:aData];
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:nil delegateQueue:nil];
[aRequest setHTTPBody:aData];
NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:aRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
//
if (error ==nil) {
NSString *aStr = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"ResponseString:%#",aStr);
NSMutableDictionary *aMutDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
aMutDict = [aMutDict dictionaryByReplacingNullsWithBlanks];
dispatch_async(dispatch_get_main_queue(), ^{
completionBlock(aMutDict);
});
}
else
{
dispatch_async(dispatch_get_main_queue(), ^{
failure(error);
});
}
}];
[postDataTask resume];
}
-(NSString *)getFormDataStringWithDictParams:(NSDictionary *)aDict
{
NSMutableString *aMutStr = [[NSMutableString alloc]initWithString:#""];
for (NSString *aKey in aDict.allKeys) {
[aMutStr appendFormat:#"%#=%#&",aKey,aDict[aKey]];
}
NSString *aStrParam;
if (aMutStr.length>2) {
aStrParam = [aMutStr substringWithRange:NSMakeRange(0, aMutStr.length-1)];
}
else
aStrParam = #"";
return aStrParam;
}
Use Like This
NSDictionary* param = #{
#"Key1":#"Value1",
#"Key2":#"value2"
};
[self callWebserviceWithParams:param withURL:#"URL String" withTarget:self withCompletionBlock:^(NSMutableDictionary *aMutDict) {
//code For Success
} withFailureBlock:^(NSError *error) {
// code for WS Responce failure
}];
also you have to set this method in NSObject Class and make it simple and used in whole app.

Answer 3

Another option Nsurlsession:
-(void)Fetchdata
{
NSURLSessionConfiguration *defaultSessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration:defaultSessionConfiguration];
// Setup the request with URL
NSURL *url = [NSURL URLWithString:#"http://52.2/category_list.php"];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
// Convert POST string parameters to data using UTF8 Encoding
NSString *postParams = #"admin_id=19";
NSData *postData = [postParams dataUsingEncoding:NSUTF8StringEncoding];
// Convert POST string parameters to data using UTF8 Encoding
[urlRequest setHTTPMethod:#"POST"];
[urlRequest setHTTPBody:postData];
// Create dataTask
NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:urlRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSDictionary *results = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSLog(#"%#",results);
arryTempdata = [[results valueForKey:#"message"] valueForKey:#"banner"];
NSLog(#"%#",arryTempdata);
tblV.reloadData;
}];
// Fire the request
[dataTask resume];
}