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Swift - 使用UserDefaults来进行本地数据存储
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importUIKit
classViewController:UIViewController{
overridefuncviewDidLoad() {
super.viewDidLoad()
print("用户uuid:\(get_uuid())")
}
overridefuncdidReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
funcget_uuid() ->String{
letuserid =UserDefaults.standard.string(forKey:"hangge")
//判断UserDefaults中是否已经存在
if(userid !=nil){
returnuserid!
}else{
//不存在则生成一个新的并保存
letuuid_ref =CFUUIDCreate(nil)
letuuid_string_ref =CFUUIDCreateString(nil, uuid_ref)
letuuid = uuid_string_refas!String
UserDefaults.standard.set(uuid, forKey:"hangge")
returnuuid
}
}
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letuserDefault =UserDefaults.standard
//Any
userDefault.set("hangge.com", forKey:"Object")
letobjectValue:Any? = userDefault.object(forKey:"Object")
//Int类型
userDefault.set(12345, forKey:"Int")
letintValue = userDefault.integer(forKey:"Int")
//Float类型
userDefault.set(3.2, forKey:"Float")
letfloatValue = userDefault.float(forKey:"Float")
//Double类型
userDefault.set(5.2240, forKey:"Double")
letdoubleValue = userDefault.double(forKey:"Double")
//Bool类型
userDefault.set(true, forKey:"Bool")
letboolValue = userDefault.bool(forKey:"Bool")
//URL类型
userDefault.set(URL(string:"")!, forKey:"URL")
leturlValue = userDefault.url(forKey:"URL")
//String类型
userDefault.set("hangge.com", forKey:"String")
letstringValue = userDefault.string(forKey:"String")
//NSNumber类型
varnumber =NSNumber(value:22)
userDefault.set(number, forKey:"NSNumber")
number = userDefault.object(forKey:"NSNumber")as!NSNumber
//Array类型
vararray:Array= ["123","456"]
userDefault.set(array, forKey:"Array")
array = userDefault.array(forKey:"Array")as! [String]
//Dictionary类型
vardictionary = ["1":"hangge.com"]
userDefault.set(dictionary, forKey:"Dictionary")
dictionary = userDefault.dictionary(forKey:"Dictionary")as! [String:String]
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letuserDefault =UserDefaults.standard
//UILabel对象存储
//将对象转换成Data流
letlabel =UILabel()
label.text ="欢迎访问hangge.com"
letlabelData =NSKeyedArchiver.archivedData(withRootObject: label)
//存储Data对象
userDefault.set(labelData, forKey:"labelData")
//UILabel对象读取
//获取Data
letobjData = userDefault.data(forKey:"labelData")
//还原对象
letmyLabel =NSKeyedUnarchiver.unarchiveObject(with: objData!)as?UILabel
print(myLabel)
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letuserDefault =UserDefaults.standard
//UIImage对象存储
//将对象转换成Data流
letimage1 =UIImage(named:"Apple.png")!
letimage2 =UIImage(cgImage: image1.cgImage!, scale: image1.scale,
orientation: image1.imageOrientation)
letimageData =NSKeyedArchiver.archivedData(withRootObject: image2)
//存储Data对象
userDefault.set(imageData, forKey:"imageData")
//UIImage对象读取
//获取Data
letobjData = userDefault.data(forKey:"imageData")
//还原对象
letmyImage =NSKeyedUnarchiver.unarchiveObject(with: objData!)as?UIImage
print(myImage)
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letuserDefault =UserDefaults.standard
//自定义对象存储
letmodel =UserInfo(name:"航歌", phone:"3525")
//实例对象转换成Data
letmodelData =NSKeyedArchiver.archivedData(withRootObject: model)
//存储Data对象
userDefault.set(modelData, forKey:"myModel")
//自定义对象读取
letmyModelData = userDefault.data(forKey:"myModel")
letmyModel =NSKeyedUnarchiver.unarchiveObject(with: myModelData!)as!UserInfo
print(myModel)
//----- 自定义对象类 -----
classUserInfo:NSObject,NSCoding{
varname:String
varphone:String
//构造方法
requiredinit(name:String="", phone:String="") {
self.name = name
self.phone = phone
}
//从object解析回来
requiredinit(coder decoder:NSCoder) {
self.name = decoder.decodeObject(forKey:"Name")as?String??""
self.phone = decoder.decodeObject(forKey:"Phone")as?String??""
}
//编码成object
funcencode(with coder:NSCoder) {
coder.encode(name, forKey:"Name")
coder.encode(phone, forKey:"Phone")
}
}
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UserDefaults.standard.removeObject(forKey:"hangge")
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