刪去的話就變成0，上面的M會消失
方法壹：
恢復出廠設定（用這種方法模式以及ABCDEFXYM表示的數都會恢復（0））
shift+9
3
方法二：
ALPHA+M+（M）
shift+M+（M-）
方法三：
清空資料（用這種方法模式以及ABCDEFXYM表示的數都會恢復（0））
shift+9
2
怎麽刪除plist裏面的資料主要操作：
1.獲得plist路徑 -(NSString*)getPlistPath；
2.判斷沙盒中名為plistname的檔案是否存在 -(BOOL) isPlistFileExists；
3.讀取沙盒中Document資料夾下的BookList.plist檔案
[NSMutableDictionarydictionaryWithContentsOfFile:plistPath];
4.寫入檔案 if ([plistDictionary writeToFile:plistPath atomically:YES])
WBBooksManager.m檔案：
#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;
}
獲得plist路徑
-(NSString*)getPlistPath{
沙盒中的檔案路徑
NSArray *storeFilePath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *doucumentsDirectiory = [storeFilePath objectAtIndex:0];
NSString *plistPath =[doucumentsDirectiory stringByAppendingPathComponent:@"WBBooks.plist"]; 根據需要更改檔名
return plistPath;
}
判斷沙盒中名為plistname的檔案是否存在
-(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檔案不存在，將工程中已建起的plist檔案寫入沙盒中
if (! [[WBBooksManager sharedInstance] isPlistFileExists]) {
從自己建立的plist檔案 復制到沙盒中 ，方法壹
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];
}
}
判斷key的書是否存在
-(BOOL)isBookExistsForKey:(NSString*)key{
NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath];
NSMutableDictionary *WBBooksDictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
根目錄下存在名為bookname的字典
if ([WBBooksDictionary objectForKey:key]) {
return YES;
}else{
return NO;
}
}
根據key值刪除對應書籍
-(void)removeBookWithKey:(NSString *)key{
NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath];
NSMutableDictionary *WBBooksDictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
[WBBooksDictionary removeObjectForKey:key];
[WBBooksDictionary writeToFile:plistPath atomically:YES]; 刪除後重新寫入
}
刪除plistPath路徑對應的檔案
-(void)deletePlist{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath];
[fileManager removeItemAtPath:plistPath error:nil];
}
將dictionary寫入plist檔案，前提：dictionary已經準備好
-(void)writePlist:(NSMutableDictionary*)dictionary forKey:(NSString *)key{
NSMutableDictionary *plistDictionary = [[NSMutableDictionary alloc]init];
如果已存在則讀取現有資料
if ([[WBBooksManager sharedInstance]isPlistFileExists]) {
plistDictionary = [[WBBooksManager sharedInstance]readPlist];
}
增加壹個數據
[plistDictionary setValue:dictionary forKey:key]; 在plistDictionary增加壹個key為...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;
}
讀取plist檔案內容復制給dictionary 備用
-(void)readPlist:(NSMutableDictionary **)dictionary{
NSString *plistPath = [[WBBooksManager sharedInstance] getPlistPath];
*dictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
}
更改壹條資料，就是把dictionary內key重寫
-(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];
}
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