// 将返回的json字符串转Dictory
let json = """
{
"name": "jack",
"age": 20,
"description": "A student."
}
""".data(using: .utf8)!
if let jsonData = jsonString.data(using: .utf8) {
do {
let json = try JSONSerialization.jsonObject(with: jsonData, options: [])
if let dictionary = json as? [String: Any],
let key2 = dictionary["key2"] as? [String: Any],
let innerKey2 = key2["key2"] as? [String: Any],
let value = innerKey2["key1"] as? String {
print(value) // 输出"value3"
}
} catch {
print("解析JSON数据失败：(error)")
}
}
// 定义数据类型，遵守Codable协议
// 注意定义的类型与接口返回对应，否则JSONSerialization时崩溃
// Struct模型可以根据json中的数据关系对应嵌套
struct ContactSimpleModel: Codable {
var relation: String
var name: String
struct ContactSimpleModel1: Codable {
var relation: String
var name: String
struct ContactSimpleModel2: Codable {
var relation: String
var name: String
}
}
}
字典与struct互相转换
let decoder = JSONDecoder()
let resList = try widgets.map { (item) -> AdJsonModel in
let data = try JSONSerialization.data(withJSONObject: item, options: [])
let res = try decoder.decode(AdJsonModel.self, from: data)
return res
}
return resList
// 扩展 Encodable 协议
extension Encodable {
var dictionary: [String: Any]? {
if let data = try? JSONEncoder().encode(self) {
if let dict = try? JSONSerialization.jsonObject(with: data) as? [String: Any] {
return dict
}
return nil
}
return nil
}
}
struct Person: Codable {
var name: String
var age: Int
}
var people = [Person(name: "John", age: 30), Person(name: "Mary", age: 25)]
//转成data保存
let data = try! JSONEncoder().encode(people)
UserDefaults.standard.set(data, forKey: "peopleData")
//取
if let data = UserDefaults.standard.data(forKey: "peopleData") {
let people = try! JSONDecoder().decode([Person].self, from: data)
}
lazy var adListDirPath: String? = {
let documentDic = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
let adUrl = documentDic?.appendingPathComponent(":ad")
if let adUrlSub = adUrl {
var isDic: ObjCBool = ObjCBool(false)
// 判断adUrlSub.path路径是否存在，如果是文件路径则isDic=false, 如果是目录路径isDic=true
if FileManager.default.fileExists(atPath: adUrlSub.path, isDirectory: &isDic) && isDic.boolValue {
return adUrlSub.absoluteString
}
do {
// 如果路径不存在，则创建本地路径，withIntermediateDirectories: true表示如果路径中间有未创建的，则把中间的目录也创建
try FileManager.default.createDirectory(at: adUrlSub, withIntermediateDirectories: true, attributes: nil)
return adUrlSub.absoluteString
} catch {
Logger.error(":adDataManager", content: error.localizedDescription)
return nil
}
}
return nil
}()
1.先删除历史文件
do {
try FileManager.default.removeItem(at: filePathUrl)
return true
} catch {
Logger.error(":adDataManager", content: error.localizedDescription)
return false
}
2.保存新文件
NSDictionary(object: adList, forKey: adListRootKey).write(to: filePathUrl, atomically: true)
3.读取本地文件
let dict = try NSDictionary(contentsOf: filePathUrl, error: ())
func unzipFile() {
let zipPath = "/path/to/zip/file"
let destinationPath = "/path/to/destination/folder"
do {
try ZipArchive.unzipFile(atPath: zipPath, toDestination: destinationPath)
} catch {
print("Error unzipping file: (error.localizedDescription)")
}
}
//0.自定义设置缓存大小 URLCache.shared = URLCache(memoryCapacity: 10 * 1024 * 1024, diskCapacity: 50 * 1024 * 1024, diskPath: nil) //1.缓存 SDWebImage批量下载图片 SDWebImagePrefetcher.shared().prefetchURLs方法下载的图片本地路径默认是Library/Caches/com.hackemist.SDWebImageCache.default目录下的缓存文件。 可以通过SDWebImageManager.shared().imageCache.diskCachePath方法获取具体路径。 //2.使用 在UIImageView加载图片时，使用AAImageView.sd_setImage(with: url, placeholderImage: nil)进行价值
//3.删除缓存 SDWebImageManager.shared.imageCache.removeImage(forKey: $0, cacheType: SDImageCacheType.all)
let list = dict[adListRootKey] as? Array<[String: Any]>
if let listSub = list {
let decoder = JSONDecoder()
let resList = listSub.map { (item) -> AdJsonModel? in