- [Instructor] As per API documentation,…we expect JSON data in the payload.…I'm going to rely on the JSON parsing capabilities…introduced with Sys4.…We can map JSON payloads to objects…that have a similar structure…without writing a single line of code.…All we have to do is define the objects…that match the JSON structure.…So I went ahead and created the structures…for the OpenWeatherMap service payload…to save us some time.…Let's add this file to the project.…
So I select the Networking group, right-click on it,…and choose Add Files to "Weather App".…From the AddOn folders, I pick up the mappings file,…and add it to our project.…As you can see, so these are the structures…that match the JSON payload.…The property names and their type…must match the corresponding keys and values…in the JSON structure.…Now, let's get back to our NetworkController.…
To decode the response,…I'm going to rely on the private helper method,…so let's uncomment it.…Next, I need to make sure that the return data is not nil.…If the payload is nil, I'm going to return an error…
Author
Released
1/2/2018- Comparing object-oriented programming with protocol-oriented programming
- Methods and class-bound protocols
- Adopting a protocol
- Generics
- Declaring asynchronous behavior
- Preparing and implementing fallback logic
- Implementing an app using protocol-oriented programming
Skill Level Intermediate
Duration
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Introduction
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Welcome1m 3s
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1. Protocol-Oriented Programming
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The object-oriented way7m 28s
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POP vs. OO: The differences3m 50s
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2. Protocols
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What's a protocol?2m 29s
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Adopting a protocol1m 8s
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Polymorphism4m 12s
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Protocol inheritance4m 31s
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Protocol extensions4m 59s
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Protocol composition4m 23s
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3. Generics
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Why generics?1m 31s
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Generic types3m 15s
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Generics and protocols2m 48s
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Constrained associated types2m 51s
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4. Implement the Weather App Using POP
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Weather app design2m 54s
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Project overview1m 53s
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Presenting data4m 18s
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Fallback service3m 24s
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Implement fallback logic4m 3s
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Conclusion
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Next steps45s
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Video: Completing the network controller