iOS开发——数据持久化Swift篇&（一）NSUserDefault

  1     
  2     //******************** 5.1 NSUserDefault和对象归档
  3     func useNSUserDefault()
  4     {
  5         //通过单利来创建一个NSUserDefaults对象，全局变量NSUserDefault，可在整个项目传递变量
  6         var userDefault:NSUserDefaults = NSUserDefaults.standardUserDefaults()
  7 
  8         //通过init方法创建
  9         var userDefault1:NSUserDefaults = NSUserDefaults(suiteName: "SwiftClass")!
 10         
 11         //获取userDefault单利下所有的值
 12         println(userDefault.dictionaryRepresentation())
 13         
 14         //判断NSUserDefaults的“appMessage”key 在dictionaryRepresentation中是否存在，如果不存在就设置“appMessage”值为This is app message。
 15         if(userDefault.objectForKey("message") == nil){
 16             userDefault.setObject("This_is_my_default_message", forKey: "message")
 17         }
 18         
 19         //如果想单独看某个key的设置，例如:
 20         var dic = userDefault.dictionaryRepresentation()
 21         var object_one:AnyObject? = (dic as NSDictionary).objectForKey("AppleKeyboards")
 22 //        //或者
 23 //        var object_one:AnyObject?  = dic["AppleKeyboards"]
 24         
 25         if let oValue: AnyObject! = object_one {
 26             println(oValue)
 27         }
 28         
 29         
 30         //Int类型
 31         //设置
 32         userDefault.setInteger(123456, forKey: "Int")
 33         //读取
 34         var intValue = userDefault.integerForKey("Int")
 35         println(intValue)
 36         
 37         //Float类型
 38         //设置
 39         userDefault.setFloat(3.2, forKey: "Float")
 40         //读取
 41         var floatValue = userDefault.floatForKey("Float")
 42         println(floatValue)
 43         
 44         //Double类
 45         //设置
 46         userDefault.setDouble(5.6890, forKey: "Double")
 47         //读取
 48         var doubleValue = userDefault.doubleForKey("Double")
 49         println(doubleValue)
 50         
 51         //Bool类型
 52         //设置
 53         userDefault.setBool(true, forKey: "Bool")
 54         //读取
 55         var boolValue = userDefault.boolForKey("Bool")
 56         println(boolValue)
 57         
 58         //NSURL类型
 59         //设置
 60         userDefault.setURL(NSURL(string: "http://www.iphonetrain.com")!, forKey: "NSURL")
 61         //读取
 62         var urlValue = userDefault.URLForKey("NSURL")
 63         println(urlValue)
 64         
 65    
 66         
 67         //保存NSDate数据
 68         //将对象转换成NSData流
 69         var imageData:NSData = NSKeyedArchiver.archivedDataWithRootObject(UIImage(named: "SwiftClassWeiXin.png")!)
 70         
 71         //存储NSData对象
 72         userDefault.setObject(imageData, forKey: "imageData")
 73         
 74         //读取数据
 75         //获取NSData
 76         var objData:AnyObject? = userDefault.objectForKey("imageData")
 77         
 78         //还原对象
 79 //        var myImage:AnyObject? = NSKeyedUnarchiver.unarchiveObjectWithData(objData as NSData)
 80         
 81         
 82         //2015年5月2号修改
 83         var myImage:AnyObject? = NSKeyedUnarchiver.unarchiveObjectWithData(objData as! NSData)
 84         
 85         
 86         
 87         //初始一个UIImage对象
 88         println(myImage)
 89         
 90         
 91         
 92         
 93         //自定义的类实现存取需要通过NSData做载体
 94         
 95         //创建AppsModel的实例
 96        var model = AppsModel(imageName: "appIcon2.png", app_Name: "租房点评", app_Description: "租房被骗？现在开始，你来改变这一切！《租房点评》为你而备，租房无忧！")
 97         
 98         //实例对象转换成NSData
 99         var modelData:NSData = NSKeyedArchiver.archivedDataWithRootObject(model)
100         
101         //存储NSData对象
102         userDefault.setObject(modelData, forKey: "myAppModel")
103         
104         
105         
106         
107         
108         
109         
110         
111         //保存NSString, 
112         userDefault.setValue("1_NSString", forKey: "NSString")
113         userDefault.setObject("1_NSString1", forKey: "NSString1")
114         
115         //保存NSNumber, 
116         var number:NSNumber = NSNumber(int: 32)
117         userDefault.setValue(number, forKey: "number")
118         userDefault.setObject(number, forKey: "number1")
119 
120         //保存NSArray
121         var array1:NSArray = NSArray(array:["22222","33333"])
122         userDefault.setValue(array1, forKey: "array")
123         userDefault.setObject(array1, forKey: "array1")
124 
125         //保存NSDictionary
126         var dictionary:NSDictionary = NSDictionary(dictionary: ["1":"1111"])
127         userDefault.setValue(dictionary, forKey: "dictionary")
128         userDefault.setObject(dictionary, forKey: "dictionary1")
129         
130         
131         
132         
133         var value:AnyObject? = userDefault.valueForKey("dictionary")
134         println(value)
135         
136         value = userDefault.objectForKey("dictionary1")
137         println(value)
138 
139         
140         
141         //-------- 删除所有的值
142         var ar:NSDictionary = userDefault.dictionaryRepresentation()
143         
144         for key in ar.allKeys {
145             
146 //            userDefault.removeObjectForKey(key as String)
147             
148             //2015年5月2号修改
149             userDefault.removeObjectForKey(key as! String)
150             
151             userDefault.synchronize()
152         }
153     }