数据

1.归档：把对象转成 NSData 唯一方式

NSCoding 协议

NSData*data = [NSKeyedArchiverarchivedDataWithRootObject:self.Myview];

[datawriteToFile:@"/Users/tao-pc/Desktop/name.arch"atomically:YES];

反归档：把 data 转回对象

NSData*data = [NSDatadataWithContentsOfFile:@"/Users/tao-pc/Desktop/name.arch"];

UIView*view = [NSKeyedUnarchiverunarchiveObjectWithData:data];

自定义归档

@interfacePerson :NSObject

- (void)encodeWithCoder:(NSCoder*)aCoder{

[aCoderencodeObject:self.nameforKey:@"name"];

[aCoderencodeInt:self.ageforKey:@"age”];

}

- (nullableinstancetype)initWithCoder:(NSCoder*)aDecoder{

self= [superinit];

if(self) {

self.name= [aDecoderdecodeObjectForKey:@"name"];

self.age= [aDecoderdecodeIntForKey:@"age"];

}

returnself;

}

//归档

//    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:p];//    [data writeToFile:@"/Users/tarena/Desktop/person.arch" atomically:YES];

//自定义对象反归档

NSData*data = [NSDatadataWithContentsOfFile:@"/Users/tarena/Desktop/person.arch"];

Person*p = [NSKeyedUnarchiverunarchiveObjectWithData:data];

---

XML_Dom

+(NSMutableArray*)parseSonsWithData:(NSData*)data{

NSMutableArray*songs = [NSMutableArrayarray];

//创建解析对象

TBXML*tbxml = [[TBXMLalloc]initWithXMLData:dataerror:nil];

//得到根元素

TBXMLElement*songsEle = tbxml.rootXMLElement;

//通过父元素获取某个名字的子元素

TBXMLElement*songEle = [TBXMLchildElementNamed:@"song"parentElement:songsEle];

//遍历每一首歌曲

while(songEle) {

//获取歌曲的各个数据

TBXMLElement*titleEle = [TBXMLchildElementNamed:@"title"parentElement:songEle];

TBXMLElement*artistEle = [TBXMLchildElementNamed:@"artist"parentElement:songEle];

TBXMLElement*timeEle = [TBXMLchildElementNamed:@"time"parentElement:songEle];

NSString*title = [TBXMLtextForElement:titleEle];

NSString*artist = [TBXMLtextForElement:artistEle];

NSString*time = [TBXMLtextForElement:timeEle];

//获取属性的专辑名称

NSString*albumName = [TBXMLvalueOfAttributeNamed:@"albumName"forElement:songEle];

Song*song = [Songnew];

song.title= title;

song.artist= artist;

song.time= time;

song.albumName= albumName;

[songsaddObject:song];

//获取剩下的其余兄弟元素

songEle = [TBXMLnextSiblingNamed:@"song"searchFromElement:songEle];

}

returnsongs;

}

---

CoreData: 核心数据

OS 提供的封装了 sqlite 数据库的 api 框架

每个 ViewController 的 NavigationController 都时不同的，他的的 Controllers 个数不同

基本的使用

1.导入AppDelegate 获取到他的AppDelegate.managedObjectContext

#import"AppDelegate.h"

AppDelegate*app = [UIApplicationsharedApplication].delegate;

2.插入数据

Student*stu = [NSEntityDescriptioninsertNewObjectForEntityForName:@"Student"inManagedObjectContext:app.managedObjectContext];

[appsaveContext];

3.查询数据

NSFetchRequest*request = [[NSFetchRequestalloc]initWithEntityName:@"Student"];

NSArray*sutdents = [app.managedObjectContextexecuteFetchRequest:requesterror:nil];

4.获取之后修改，再跟新

Player*player =self.players[indexPath.row];

5.删除数据 获取到删除

Player*player =self.players[indexPath.row];

AppDelegate*app = [UIApplicationsharedApplication].delegate;

[app.managedObjectContextdeleteObject:player];

[appsaveContext];