IOS数据的共享及持久化处理


    程序运行效果截图:



1,数据的共享可以通过AppDelegate来解决

因为AppDelegate的特殊作用,它可以在其他视图控制器中获取AppDelegate对象,因此,将数据模型放置到AppDelegate类中,所有的页面都相它获取数据,并且共同维护它(CRUD操作),如此就可以实现数据共享。

例如原型视图控制器中的loadAllContractor方法可以修改如下:

-(void)loadAllContractor{

//获取当前应用指针,访问所有联系人集合

AppDelegate*appDelegate = (AppDelegate*)[UIApplicationsharedApplication].delegate;

self.allContactorsArray= appDelegate.allContactorsArray;

}

2、数据的持久化

持久化方式很多,数据库这里先不提,而是选用简单的plist文件来解决

步骤:

1)修改MPContactor类,实现NSCoding协议,让其支持归档。

这里注意,处理归档相关操作,还新增了两个成员属性:favorite和portraitFileName

@property(nonatomic,assign)BOOLfavorite;

@property(nonatomic,retain)NSString*portraitFileName;

-(id)initWithName:(NSString*)name andPortraitFileName:(NSString*)fileName andIntroduce:(NSString*)introduce;

//加载plist文件,读取联系人信息,如果不存在则创建

if([selfloadAllContactorFromPlistFile] ==NO) {

[selfinitAndSaveAllContactorsToPlistFile];

}

//程序运行,从plist文件中加载数据,如果成功返回YES,如果文件不存在则返回NO

-(BOOL)loadAllContactorFromPlistFile{

NSString*filePath =NSHomeDirectory();

NSString*filePath =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)[0];

NSLog(@"%@",filePath);

self.allContactorsArray= [NSKeyedUnarchiverunarchiveObjectWithFile:filePath];

if(self.allContactorsArray!=nil) {

returnYES;

}

returnNO;

}

//首次读取需要创建并初始化plist文件,主要步骤如下

//1、创建字典集合,初始化数据

//2、将当前数据写入plist文件

-(void) initAndSaveAllContactorsToPlistFile{

MPContactor*liwen = [[MPContactoralloc]initWithName:@"李玟"andPortraitFileName:@"liwen.png"andIntroduce:@"国际范儿的歌手,大气、努力、态度诚恳!"];

MPContactor*likeqin = [[MPContactoralloc]initWithName:@"李克勤"andPortraitFileName:@"likeqin.png"andIntroduce:@"唱功厉害,态度认真"];

MPContactor*xujiaying = [[MPContactoralloc]initWithName:@"徐佳莹"andPortraitFileName:@"xujiaying.png"andIntroduce:@"国际范儿的歌手,大气、努力、态度诚恳!"];

MPContactor*zhangxinzhe = [[MPContactoralloc]initWithName:@"张信哲"andPortraitFileName:@"zhangxinzhe.png"andIntroduce:@"姜是老的辣"];

MPContactor*rongzuer = [[MPContactoralloc]initWithName:@"容祖儿"andPortraitFileName:@"rongzuer.png"andIntroduce:@"性格不错,明明可以靠脸,但是..."];

MPContactor*laolang = [[MPContactoralloc]initWithName:@"老狼"andPortraitFileName:@"laolang.png"andIntroduce:@"时代的标志性人物,悲催的是没来及找到感觉就..."];

MPContactor*suyunying = [[MPContactoralloc]initWithName:@"苏运莹"andPortraitFileName:@"suyunying.png"andIntroduce:@"有特点的丫头,确实够野!"];

MPContactor*huangzhilie = [[MPContactoralloc]initWithName:@"黄致列"andPortraitFileName:@"huangzhilie.png"andIntroduce:@"有实力,但是比较明显的工业特征,还是厉害的。"];

liwen.favorite=YES;

rongzuer.favorite=YES;

xujiaying.favorite=YES;

self.allContactorsArray= [NSMutableArrayarrayWithObjects:liwen,likeqin,xujiaying,zhangxinzhe,rongzuer,laolang,suyunying,huangzhilie,nil];

[selfsaveAllContactorsDataToPlistFile];

}

3)修改个页面的数据源初始化代码:

-(void)loadAllContractor{

//获取当前应用指针,访问所有联系人集合

AppDelegate*appDelegate = (AppDelegate*)[UIApplicationsharedApplication].delegate;

self.allContactorsArray= appDelegate.allContactorsArray;

}



IOS数据的共享及持久化处理_第1张图片

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