博客

使用plist存入本地缓存

1. 类要遵守协议NSCoding

class MyClass: NSCoding {
	var name = "张三"
	var age = 8
}

2. 获取路径

    private func getFileURL() -> URL? {

        guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else {
            return nil
        }
        let fileURL = documentsDirectory.appendingPathComponent("MyTempData.plist")

        return fileURL
    }

3. 存入数据方法

		let array = [MyClass]() 
		// ... 添加array元素
        guard let fileURL = getFileURL() else {
            return
        }
        
        do {
            let archivedData = try NSKeyedArchiver.archivedData(withRootObject: array, requiringSecureCoding: false)
            try archivedData.write(to: fileURL)
        } catch {
            print("Error: \(error)")
        }
         

4. 读取数据方法

		let res = [MyClass]()
        guard let fileURL = getFileURL() else {
            return res
        }

        do {
            let data = try Data(contentsOf: fileURL)
            if let unarchivedArray = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data) as? [MyClass] {
                print("解析数据成功")
                res = unarchivedArray
            }
        } catch {
            // 处理错误
            print("解析数据Error: \(error)")
        }

        
        return res