标签：des style color os 文件 io width for
重要概念：某些路径下“只能读，不能写”的原因
iPhone、ipad真机上
Resouces文件夹：是只读的，无法写入。
document 和temp文件夹：可读，可写。
@inter PlistMange :NSObject
-(void)resourcePathFileRead; //当前工程资源目录，不同于真机“沙箱”中的路径
-(NSString*)docPath; //获取document文件夹路径
-(BOOL)isDirNeedCreate:(NSString*)dirPath; //判断目录是否需要新的创建
-(BOOL)isFileNeedCreate:(NSString*)filePath;// 判断文件是否需要被创建
-(void)doAdd;
-(void)doRead;
-(void)doModify;
-(void)doDelete;
@end
函数的实现：
-（NSString*）docPath
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,Yes);
return[Paths objectIndex:0];// 返回document的路径
}
-(BOOL)isDirNeedCreate:(NSString*)dirPath
{
if(NO==[NSFileManager default]fileExistsAtPath:dirPath])
{
return [[NSFileManager defaultManager]creatDirectoryAtPath:dirPath];
}
return NO;
}
//文件是否需要被创建，也就是看看文件是否存在，不存在的话就创建
-(BOOL)isFileNeedCreate:(NSString*)filePath
{
if(NO==[[NSFileManager defaultManager]fileExistsAtPath:filePath])
{
return [NSFileManager defaultManager]createFileAtPath:filepath contents:nil attributes:nil];
}
return NO;
}
添加：包括创建不存在的空文件
-(void)doAdd
{
NSString *docPath = [self docPath];
NSString *dataFile = [docPath stringByAppendingPathComonent:@"docData.plist"];
if(YES==[self isFileNeedCreate:dataFike])
{
NSLog(@"原文件不存在，现已创建空文件");
}else
{
NSLog(@"文件已经存在，无需创建!");
}
NSMutableDictionary *plistDic = [[NSMutableDICtionary alloc]init];
//添加2个“单条记录”
[plstDic setObject:@"shanghai" forKey@"recordKey001"];
[plstDic setObject:@"beijing" forKey@"recordKey002"];
//添加2个“字典记录”
[plistDic setobject:[NSDictionary dictionaryWithObjectsAndKeys:@"Jack",@"name",@"22",@"age",nil]forKey:@"recordKey001"];
[plistDic setobject:[NSDictionary dictionaryWithObjectsAndKeys:@"Tom",@"name",@"33",@"age",nil]forKey:@"recordKey002"];
[plistDic writeToFile:dataFile atomically:YES];//完全覆盖
}
对应路径下生成了新文件：
内容如下：
读取
-(void)doRead{
NSString *dataFile = [[self docPath]stringByAppendingPathComponent:@"docData.plist"];
//读取所有内容
NSDictionary *dic = [NSDictionary dictionaryWithContentsOfFile:dataFile];
//获取第一层字典
NSDictionary *dicValue ＝ [dic objectForKey:@"dicKey001"];
//获取第一层" 字典记录"中的"子元素"
NSlog(@"读取第一层“字典记录”中的“子元素”:\nname = %@ ",[dicValue objectForKey:@"name"])
//读取第一层“单挑记录”
NSlog(@"读取第一层“ 单条记录 ”:\nrecordKey001 = %@ ",[dic objectForKey:@"nrecordKey001"])
运行记录如下
}
修改
-(void) doModify{
NSString *dataFile=[[self docPath] stringByAppendingPathComponent:@"docData.plist"];
NSMutableDictionary *dic = [[[NSMutableDictionary alloc]initWithContentsOfFile:dataFile]mutableCopy];
//修改“单条记录”
NSString *city = [dic objectForKey:@"recordKey001"];
city = @"shanghai-new";
[dic setObject:city forKey:@"recordKey001"];
//修改“字典记录”
NSMutableDictionary *personInfo = [dic objectForKey:@"dicKey001"];
NSString *name = [dic objectForKey:@"name"];
name = @"Jack-new";
[personInfo setValue:name forKey:@"name"];
[dic setValue:personInfo forKey:@"dicKey001"];
//写入文件
[dic writeToFile:dataFile atomically:YES];
NSDictionary* dicResult = [NSDictionary dictionaryWithContentsOfFile:dataFile];
NSLog(@"修改结果:\n%@",dicResult);
}
删除
-(void) doDelete{
NSString *dataFile=[[self docPath] stringByAppendingPathComponent:@"docData.plist"];
NSMutableDictionary *dic = [[[NSMutableDictionary alloc]initWithContentsOfFile:dataFile]mutableCopy];
//删除“单条记录”
[dic removeObjectForKey:@"recordKey001"];
[dic removeObjectForKey:@"dicKey001"];
//删除“字典记录”
//写入文件
[dic writeToFile:dataFile atomically:YES];
NSDictionary* dicResult = [NSDictionary dictionaryWithContentsOfFile:dataFile];
NSLog(@"修改结果:\n%@",dicResult);
}
各个目录的获取
-(void)resourcePathFileRead{
NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"resourceData" ofType:@"plist"];
NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
NSLog(@"resourceData.plist文件信息如下：\n%@", data);
}标签：des style color os 文件 io width for
原文地址：http://www.cnblogs.com/286722723ma/p/3867532.html
