Swift - How to properly use delegate - ios

Question

I am using Salesforce ios sdk for my mobile application and there is a method to execute SOQL queries. For eg.,
class SfdcController: NSObject, SFRestDelegate {
let request = SFRestAPI.sharedInstance().request(forQuery:"SELECT Name FROM User LIMIT 10");
SFRestAPI.sharedInstance().send(request, delegate: self);
func request(_ request: SFRestRequest, didLoadResponse jsonResponse: Any)
{
print(jsonResponse)
}
func request(_ request: SFRestRequest, didFailLoadWithError error: Error)
{
self.log(.debug, msg: "didFailLoadWithError: \(error)")
}
}
Question
I'll execute multiple SOQL queries with in the same class and there are different methods to handle the response. Now,
Is there a way to get the reference of the request inside the didLoadResponse? So, I can write switch statement to execute different functions.
If cannot reuse the delegate, do I need to create multiple delegate class to handle each and every response?
What is the better way to do it?
Update
request
SFRestRequest 0x1700cb130
endpoint: /services/data
method: GET
path: /v39.0/sobjects/Event/describe
queryParams: []
Other way to delegate is to create a separate class and define it.
SFRestAPI.sharedInstance().send(objectDescribe, delegate: testing());
class testing: NSObject, SFRestDelegate {
func request(_ request: SFRestRequest, didLoadResponse jsonResponse: Any) {
print(jsonResponse)
}
}
But the problem with the above, I have to create a class every time when I want to execute a SOQL query.
Thanks

Answer 1

I have an idea for you. Create a separate delegate class and in that class put an identifier. Then let that separate class delegate back to your view controller.
// Create a protocol for it
class SFHandlerDelegate {
func request(_ request: SFRestRequest, handlerId: Int, didLoadResponse jsonResponse: Any)
func request(_ request: SFRestRequest, handlerId: Int, didFailLoadWithError error: Error)
}
Make a new delegate class
// this becomes the SF delegate
class SFHandler : SFRestDelegate {
var id: Int = 0
delegate: SFHandlerDelegate
init(id: Int, delegate: SFHandlerDelegate) {
self.id = id
self.delegate = delegate
}
func request(_ request: SFRestRequest, didLoadResponse jsonResponse: Any)
{
delegate.request(request, handlerId: id, didLoadResponse: jsonResponse)
}
func request(_ request: SFRestRequest, didFailLoadWithError error: Error)
{
delegate.request(request, handlerId: id, didFailLoadWithError: error)
}
}
Change the controller
class SfdcController: NSObject, SFHandlerDelegate {
let request = SFRestAPI.sharedInstance().request(forQuery:"SELECT Name FROM User LIMIT 10");
let delegate = SFHandlerDelegate(self, 123) // use some handler id
SFRestAPI.sharedInstance().send(request, delegate: delegate);
func request(_ request: SFRestRequest, handlerId: Int, didLoadResponse jsonResponse: Any)
{
switch handlerId {
case 123:
doSomething()
// whatever
}
print(jsonResponse)
}
func request(_ request: SFRestRequest, handlerId: Int, didFailLoadWithError error: Error)
{
switch handlerId {
case 123:
doSomething()
// whatever
}
self.log(.debug, msg: "didFailLoadWithError: \(error)")
}
}