iOS开发——数据持久化OC篇&plist文件增删改查操作

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);