Network data parsing for iOS development (1) -- Introduction to JSON parsing, and ios -- json

Network data parsing for iOS development (1) -- Introduction to JSON parsing, and ios -- json

Data returned to the client after a server request is generally in JSON or XML format (except for file downloads)

 

This article explains JSON parsing at will.

 

Body:

About JSON:

Supplement:

Note: The key must use double quotation marks. (But it is a single quotation mark in Java)

Conversion table of JSON-OC

Where: null -- return the NSNull type in OC

 

Usage:

There are many JSON resolution solutions, but (Apple's native) NSJSONSerialization has the best performance

Deserialization (JSON --> OC object), the following example is resolved to a dictionary object

Serialization (OC object --> JSON). Note that the dictionary value cannot be passed to nil, but [NSNull null]

Not all types can be converted to JSON.

The following are Apple's official regulations: