iOS开发——数据持久化OC篇&plist文件增删改查操作
2024-08-31 04:46:31
Plist文件增删查改
主要操作:
1.//获得plist路径 -(NSString*)getPlistPath;
2.//判断沙盒中名为plistname的文件是否存在 -(BOOL) isPlistFileExists;
3.//读取沙盒中Document文件夹下的BookList.plist文件
[NSMutableDictionarydictionaryWithContentsOfFile:plistPath];
4.//写入文件 if ([plistDictionary writeToFile:plistPath atomically:YES])
#import "WBBooksManager.h" @implementation WBBooksManager static WBBooksManager *g_instance = nil; + (WBBooksManager *)sharedInstance { @synchronized(self) { if ( g_instance == nil ) { g_instance = [[self alloc] init]; } } return g_instance; } //获得plist路径 -(NSString*)getPlistPath{ //沙盒中的文件路径 NSArray *storeFilePath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *doucumentsDirectiory = [storeFilePath objectAtIndex:]; NSString *plistPath =[doucumentsDirectiory stringByAppendingPathComponent:@"WBBooks.plist"]; //根据需要更改文件名 return plistPath; } //判断沙盒中名为plistname的文件是否存在 -(BOOL) isPlistFileExists{ NSString *plistPath =[[WBBooksManager sharedInstance]getPlistPath]; NSFileManager *fileManager = [NSFileManager defaultManager]; if( [fileManager fileExistsAtPath:plistPath]== NO ) { NSLog(@"not exists"); return NO; }else{ return YES; } } -(void)initPlist{ NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath]; //如果plist文件不存在,将工程中已建起的plist文件写入沙盒中 if (! [[WBBooksManager sharedInstance] isPlistFileExists]) { //从自己建立的plist文件 复制到沙盒中 ,方法一 NSError *error; NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *bundle = [[NSBundle mainBundle] pathForResource:@"WBBooks" ofType:@"plist"]; [fileManager copyItemAtPath:bundle toPath:plistPath error:&error]; //方法二 // NSString *path = [[NSBundle mainBundle] pathForResource:@"WBBooks"ofType:@"plist"]; // NSMutableDictionary *activityDics = [[NSMutableDictionary alloc] initWithContentsOfFile:path]; // [activityDics writeToFile:plistPath atomically:YES]; } } //判断key的书是否存在 -(BOOL)isBookExistsForKey:(NSString*)key{ NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath]; NSMutableDictionary *WBBooksDictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath]; //根目录下存在名为bookname的字典 if ([WBBooksDictionary objectForKey:key]) { return YES; }else{ return NO; } } //根据key值删除对应书籍 -(void)removeBookWithKey:(NSString *)key{ NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath]; NSMutableDictionary *WBBooksDictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath]; [WBBooksDictionary removeObjectForKey:key]; [WBBooksDictionary writeToFile:plistPath atomically:YES]; //删除后重新写入 } //删除plistPath路径对应的文件 -(void)deletePlist{ NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath]; [fileManager removeItemAtPath:plistPath error:nil]; } //将dictionary写入plist文件,前提:dictionary已经准备好 -(void)writePlist:(NSMutableDictionary*)dictionary forKey:(NSString *)key{ NSMutableDictionary *plistDictionary = [[NSMutableDictionary alloc]init]; //如果已存在则读取现有数据 if ([[WBBooksManager sharedInstance]isPlistFileExists]) { plistDictionary = [[WBBooksManager sharedInstance]readPlist]; } //增加一个数据 [plistDictionary setValue:dictionary forKey:key]; //在plistDictionary增加一个key为...的value NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath]; if([plistDictionary writeToFile:plistPath atomically:YES]){ NSLog(@"write ok!"); }else{ NSLog(@"ddd"); } } // -(NSMutableDictionary*)readPlist{ NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath]; NSMutableDictionary *resultDictionary = [[NSMutableDictionary alloc]initWithContentsOfFile:plistPath]; return resultDictionary; } //读取plist文件内容复制给dictionary 备用 -(void)readPlist:(NSMutableDictionary **)dictionary{ NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath]; *dictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath]; } //更改一条数据,就是把dictionary内key重写 -(void)replaceDictionary:(NSMutableDictionary *)newDictionary withDictionaryKey:(NSString *)key{ [[WBBooksManager sharedInstance]removeBookWithKey:key]; [[WBBooksManager sharedInstance]writePlist:newDictionary forKey:key]; } -(NSInteger)getBooksCount{ NSMutableDictionary *dictionary = [[NSMutableDictionary alloc] init]; dictionary = [[WBBooksManager sharedInstance] readPlist]; return [dictionary count]; }
//导入头文件
#import "WBBooksManager.h"
-(void)viewDidLoad中添加以下代码,是刚写的时候测试时用的,狠时繁杂。 将就着看好了、
WBBooksManager *sss = [[WBBooksManager alloc] init ]; NSString *plistPath =[[WBBooksManager sharedInstance] getPlistPath]; if( [sss isPlistFileExists]== NO ) {//不存在 NSLog(@"WBBooks.plist not exists ,build it."); NSMutableDictionary *addDictionary1 = [[NSMutableDictionary alloc] init]; NSString *addName1 = [NSString stringWithFormat:@"www"]; NSNumber *addNumber1 = [[NSNumber alloc] initWithInt:]; [addDictionary1 setValue:addName1 forKey:@"name"]; [addDictionary1 setValue:addNumber1 forKey:@"list"]; [[WBBooksManager sharedInstance]writePlist:addDictionary1 forKey:@"Add1"]; NSMutableDictionary *addDictionary2 = [[NSMutableDictionary alloc] init]; NSString *addName2 = [NSString stringWithFormat:@"aaas"]; NSNumber *addNumber2 = [[NSNumber alloc] initWithInt:]; [addDictionary2 setValue:addName2 forKey:@"name"]; [addDictionary2 setValue:addNumber2 forKey:@"list"]; [[WBBooksManager sharedInstance]writePlist:addDictionary2 forKey:@"Add2"]; } NSMutableDictionary *resultDictionary = [[NSMutableDictionary alloc] init]; [[WBBooksManager sharedInstance] readPlist:&resultDictionary]; NSLog(@"add1的结果%@", resultDictionary); NSArray *array = [resultDictionary allKeys]; //所有的Book int num = [[WBBooksManager sharedInstance] getBooksCount]; //总数 NSLog(@"array%@ %d",array,num); NSMutableDictionary *plistDictionary = [[NSMutableDictionary alloc]init]; plistDictionary = [[WBBooksManager sharedInstance]readPlist]; NSMutableDictionary *addDictionary2 = [[NSMutableDictionary alloc] init]; NSString *addName2 = [NSString stringWithFormat:@"dafd"]; NSNumber *addNumber2 = [[NSNumber alloc] initWithInt:]; [addDictionary2 setValue:addName2 forKey:@"name"]; [addDictionary2 setValue:addNumber2 forKey:@"list"]; [plistDictionary setValue:addDictionary2 forKey:@"Add2"]; [plistDictionary writeToFile:plistPath atomically:YES]; resultDictionary = [[NSMutableDictionary alloc] init]; [[WBBooksManager sharedInstance] readPlist:&resultDictionary]; NSLog(@"add1的结果%@", resultDictionary); array = [resultDictionary allKeys]; //所有的Book num = [[WBBooksManager sharedInstance] getBooksCount]; //总数 NSLog(@"array%@ %d",array,num); NSMutableDictionary *addDictionary1 = [[NSMutableDictionary alloc] init]; NSString *addName1 = [NSString stringWithFormat:@"wmmm"]; NSNumber *addNumber1 = [[NSNumber alloc] initWithInt:]; [addDictionary1 setValue:addName1 forKey:@"name"]; [addDictionary1 setValue:addNumber1 forKey:@"list"]; //判断给出的Key对应的数据是否存在 if ([[WBBooksManager sharedInstance] isBookExistsForKey:@"Add1"]) { //存在,则替换之 NSLog(@"存在,则替换之"); [[WBBooksManager sharedInstance] replaceDictionary:addDictionary1 withDictionaryKey:@"Add1"]; }else{//不存在,则写入 NSLog(@"不存在,则写入"); [[WBBooksManager sharedInstance] writePlist:addDictionary1 forKey:@"Add1"]; } resultDictionary = [[NSMutableDictionary alloc] init]; [[WBBooksManager sharedInstance] readPlist:&resultDictionary]; NSLog(@"add1的结果%@", resultDictionary); array = [resultDictionary allKeys]; //所有的Book num = [[WBBooksManager sharedInstance] getBooksCount]; //总数 NSLog(@"array%@ %d",array,num); addName1 = [NSString stringWithFormat:@"wmmm"]; addNumber1 = [[NSNumber alloc] initWithInt:]; [addDictionary1 setValue:addName1 forKey:@"name"]; [addDictionary1 setValue:addNumber1 forKey:@"list"]; //更改key对应的数据 if ([[WBBooksManager sharedInstance] isBookExistsForKey:@"Add1"]) { [[WBBooksManager sharedInstance] replaceDictionary:addDictionary1 withDictionaryKey:@"Add1"]; } resultDictionary = [[WBBooksManager sharedInstance]readPlist]; NSLog(@"add1111的结果%@", resultDictionary); //删除给出key对应的数据 if ([[WBBooksManager sharedInstance] isBookExistsForKey:@"Add1"]) { [[WBBooksManager sharedInstance] removeBookWithKey:@"Add1"]; } resultDictionary = [[WBBooksManager sharedInstance]readPlist]; NSLog(@"add1111的结果%@", resultDictionary); //删除整个plist文件 // if ([[WBBooksManager sharedInstance]isPlistFileExists]) { // [[WBBooksManager sharedInstance] deletePlist]; // } resultDictionary = [[WBBooksManager sharedInstance]readPlist]; NSLog(@"add1111的结果%@", resultDictionary);
最新文章
- Windows 上的 Jetty 小工具
- Java数据结构——优先级队列
- Sql [hierarchyid]类型如何动态插入层级数据
- JavaScript中Element与Node的区别,children与childNodes的区别
- AlloyTouch实现下拉刷新
- 实时数据处理环境搭建flume+kafka+storm:1.zookeeper 安装配置
- 1874: [BeiJing2009 WinterCamp]取石子游戏 - BZOJ
- SQL生成一柱双色球
- Notes for ";Python in a Nutshell";
- 现阶段如何开始使用v-ray for unrealengine
- FPGA设计中的异步复位、同步释放思想
- linux中的定时任务创建
- spring boot 测试类
- 项目解析1、登录验证用户是否存在 储备知识 Python 之 decorator装饰器
- [Linux] Linux系统(登陆、退出、修密码)
- SQL server数据库压缩空间
- string学习
- div清空填充
- (转)使用 linux tar 命令压缩与解压文件
- Mininet实验 MAC地址学习分析