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);