iOS开发-本地存储（偏好设置，Plist，归档）

 

 

1.   nsuserdefaults

    //todo: 1.nsuserdefaults    nsuserdefaults类除了可以存储数组、字典、nsdata外，还可以直接存储oc基本类型属性。但是不能直接作用到自定义对象.
    [[nsuserdefaults standarduserdefaults] setobject:@"" forkey:@""];//设置初始值
    [[nsuserdefaults standarduserdefaults] synchronize];//进行同步
    
    [[nsuserdefaults standarduserdefaults] objectforkey:@""];//取值

2.    plist

    //todo: 2.plist文件
    //1.根据已有plist文件取值
    nsstring *pathstring = [[nsbundle mainbundle] pathforresource:@"property list" oftype:@"plist"];
    //如果plist文件是一个nsarray,用数组取
    nsarray *array = [nsarray arraywithcontentsoffile:pathstring];
    //如果plist文件是一个nsdictionary,用字典取
    nsdictionary *dictionary = [nsdictionary dictionarywithcontentsoffile:pathstring];

    //2.创建plist文件
    nsarray *homedirectory = nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes);
    nsstring *documentstring = homedirectory[0];
    nsstring *documentpath = [documentstring stringbyappendingpathcomponent:@"gcd.plist"];
    nsfilemanager *filemanager = [nsfilemanager defaultmanager];
    [filemanager createfileatpath:documentpath contents:nil attributes:nil];
    
    nsarray *filearray = @[@{@"name":@"one"},@{@"name":@"two"}];
    [filearray writetofile:documentpath atomically:yes];//写入数据
    
    nsarray *readarray = [nsarray arraywithcontentsoffile:documentpath];//读取数据

 

3.  归档、解档

    //todo: 3.归档/解档
    archivemodel *model = [[archivemodel alloc]init];
    model.name = @"小明";
    model.age = @"18";
    model.sex = @"男";

    nsarray *patharray = nssearchpathfordirectoriesindomains(nsdocumentdirectory, nsuserdomainmask, yes);
    nsstring *filepath = [patharray[0] stringbyappendingpathcomponent:@"model"];
    
    /*
    一.只归档一个对象
    
    [nskeyedarchiver archiverootobject:model tofile:filepath];
    */
    
    /*
     一.只解档一个对象
     if ([[nsfilemanager defaultmanager] fileexistsatpath:filepath]) {
     //路径存在
     archivemodel *readmodel = [nskeyedunarchiver unarchiveobjectwithfile:filepath];
     nslog(@"解档：%@",readmodel);
     }
     */
    
    
    //二.归档多个对象
    nsmutabledata *data = [[nsmutabledata alloc]init];
    nskeyedarchiver *keyedarchiver = [[nskeyedarchiver alloc]initforwritingwithmutabledata:data];
    [keyedarchiver encodeobject:model forkey:@"model"];
    //[keyedarchiver encodeobject:model forkey:@"key1"];
    //[keyedarchiver encodeobject:model forkey:@"key2"];
    [keyedarchiver finishencoding];

    if ([data writetofile:filepath atomically:yes]) {
        nslog(@"归档成功");
    }
    
    
    //二.解档多个对象
    if ([[nsfilemanager defaultmanager] fileexistsatpath:filepath]) {
        nsdata *data = [nsdata datawithcontentsoffile:filepath];
        nskeyedunarchiver *keyedunarchive = [[nskeyedunarchiver alloc]initforreadingwithdata:data];
        archivemodel *readmodel = [keyedunarchive decodeobjectforkey:@"model"];
        //archivemodel *readmodel = [keyedunarchive decodeobjectforkey:@"key1"];
        //archivemodel *readmodel = [keyedunarchive decodeobjectforkey:@"key2"];
        [keyedunarchive finishdecoding];

    }