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1. 通过CocoaPods安装SwiftyJSON
platform :ios, '10.0'
target '<Your Target Name>' do
use_frameworks!
pod 'SwiftyJSON', '~> 4.0.0'
end
2. 初始化
import SwiftyJSON
let json = JSON(data: dataFromNetworking)
let json = JSON(jsonObject)
if let dataFromString = jsonString.data(using: .utf8, allowLossyConversion: false) {
let json = JSON(data: dataFromString)
}
3. 下标访问
// 方式1
let name = json[1]["list"][2]["name"].string
//方式2
let name = json[1,"list",2,"name"].string
//方式3
let keys:[JSONSubscriptType] = [1,"list",2,"name"]
let name = json[keys].string
let arrayNames = json["users"].arrayValue.map({$0["name"].stringValue})
4. 循环遍历
不管JSON是数组类型还是字典类型key
的类型都为String
。
for (key,subJSON) in json {
...
}
5. 错误处理
枚举类型SwiftyJSONError
包含unsupportedType
、indexOutOfBounds
、elementTooDeep
、wrongType
、notExist
、invalidJSON
、errorDomain
。
6. 可选值获取
通过.number
、.string
、.bool
、.int
等方法获取到的是可选值。
if let id = json["user"]["name"].string {
...
} else {
...
print(json["user"]["name"].error!)
}
7. 非可选值获取
通过.xxxValue
方法获取到的是非可选值。
// 若不是String或为nil,返回“”
let name: String = json["name"].stringValue
8. 设置值
json["name"] = JSON("new-name")
json[0] = JSON(1)
json["name"].string = "Jack"
json.arrayObject = [1,2,3,4]
json.dictionaryObject = ["name":"Jack", "age":25]
9. 原始数据
let rawObject: Any = json.object
let rawValue: Any = json.rawValue
do {
let rawData = try json.rawData()
} catch {
print("Error \(error)")
}
if let rawString = json.rawString() {
...
} else {
print("json.rawString is nil")
}
10. 其他方法
exists
// 判断是否存在
if json["name"].exists()
merge
let original: JSON = [
"first_name": "Theo",
"age": 20,
"skills": ["Coding", "Reading"],
"address": [
"street": "Software St",
"zip": "210046",
]
]
let update: JSON = [
"last_name": "Tsao",
"age": 22,
"skills": ["Writing"],
"address": [
"zip": "210012",
"city": "Nanjing"
]
]
let updated = original.merge(with: update)
输出:
[
"first_name": "Theo",
"last_name": "Tsao",
"age": 22,
"skills": ["Coding", "Reading", "Writing"],
"address": [
"street": "Software St",
"zip": "210012",
"city": "Nanjing"
]
]
来源:oschina
链接:https://my.oschina.net/u/3691598/blog/1921279