IOS中的数据存储

/**
NSSearchPathDirectory.DocumentDirectory 查找Documents文件夹
NSSearchPathDomainMask.UserDomainMask 在用户的应用程序下查找
true 展开路径   false 当前应用的根路径 == “~”
*/
let docPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as NSString

// 上面代码代替下面代码，防止Documen文件夹不存在*****************************************************************

// 获得沙盒的根路径
let home = NSHomeDirectory() as NSString
// 获得Documents路径，使用NSString对象的stringByAppendingPathComponent()方法拼接路径
let docPath = home.stringByAppendingPathComponent("Documents") as NSString

1、存储为plist属性列表

func saveWithFile() {
    // 1、获得沙盒的根路径
    let home = NSHomeDirectory() as NSString
    // 2、获得Documents路径，使用NSString对象的stringByAppendingPathComponent()方法拼接路径
    let docPath = home.stringByAppendingPathComponent("Documents") as NSString
    // 3、获取文本文件路径
    let filePath = docPath.stringByAppendingPathComponent("data.plist")
    let dataSource = NSMutableArray()
    dataSource.addObject("小桥上我曾背你走过")
    dataSource.addObject("河边上为你放的烟火")
    dataSource.addObject("电影院最后一排座我们第一次吻过")
    dataSource.addObject("那么多浪漫我都记得")
    dataSource.addObject("别再跟着我漂泊")
    // 4、将数据写入文件中
    dataSource.writeToFile(filePath, atomically: true)
}
func readWithFile() {
    /// 1、获得沙盒的根路径
    let home = NSHomeDirectory() as NSString
    /// 2、获得Documents路径，使用NSString对象的stringByAppendingPathComponent()方法拼接路径
    let docPath = home.stringByAppendingPathComponent("Documents") as NSString
    /// 3、获取文本文件路径
    let filePath = docPath.stringByAppendingPathComponent("data.plist")
    let dataSource = NSArray(contentsOfFile: filePath)
    print(dataSource)
}

2、使用NSUserDefaults存储数据

func saveWithNSUserDefaults() {  
    // 1、利用NSUserDefaults存储数据  
    let defaults = NSUserDefaults.standardUserDefaults()
    // 2、存储数据  
    defaults.setObject("衣带渐宽终不悔", forKey: "name")
    // 3、同步数据  
    defaults.synchronize()
}
func readWithNSUserDefaults(){
    let defaults = NSUserDefaults.standardUserDefaults()
    let name = defaults.stringForKey("name")
    let switch = defaults.boolForKey("bool")
    print(name)
    print(switch)
}

3、归档存储：对象需要实现NSCoding协议，归档对应encode，反归档对应decode

/**
 归档数据
 需要实现NSCoding协议
 */
func saveWithNSKeyedArchiver() {
    let docPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.CachesDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as NSString
    let filePath = docPath.stringByAppendingPathComponent("contact.data")
    let contact = Contact(name: "123333", phone: "123456")
    /**
    *  数据归档处理
    */
    NSKeyedArchiver.archiveRootObject(contact, toFile: filePath)
}
// 如果上面直接运行会报错，因为你需要在要归档的对象中遵循NSCoding协议，并实现归档方法和解析方法 如：
class Contact: NSObject, NSCoding {

    var name: String?
    var phone: String?

    required init(name: String, phone: String){
        self.name = name
        self.phone = phone
    }

    // 在对象归档的时候调用（哪些属性需要归档，怎么归档）
    func encodeWithCoder(aCoder: NSCoder) {
        aCoder.encodeObject(name, forKey: "name")
    }

    // 解析NIB/XIB的时候会调用
    required init?(coder aDecoder: NSCoder) {
        super.init()
        name = aDecoder.decodeObjectForKey("name") as? String
    }
}
/**
 反归档数据
 */
func readWithNSKeyedUnarchiver() {
    let docPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.CachesDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as NSString
    let filePath = docPath.stringByAppendingPathComponent("contact.data")
    let contact = NSKeyedUnarchiver.unarchiveObjectWithFile(filePath) as! Contact
    print(contact.name!)
}

4、SQlite3

5、CoreData