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。
一、工程结构
二、源代码
1、头文件：PlistManage.h
@interfacePlistManage : 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创建-(BOOL)isFileNeedCreate:(NSString *)filePath;//判断文件是否需要创建
-(void) doAdd;-(void) doRead;-(void) doModify;-(void) doDelete;@end
2、一些基本函数的实现：
//获取document目录路径-(NSString *)docPath
{
NSArray* paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);return[paths objectAtIndex:0];
}//路径是否需要创建-(BOOL)isDirNeedCreate:(NSString *)dirPath
{if( NO ==[[NSFileManager defaultManager] fileExistsAtPath:dirPath] )
{return[[NSFileManager defaultManager] createDirectoryAtPath:dirPath
withIntermediateDirectories:YES
attributes:nil
error:NULL];
}returnNO;
}//文件是否需要创建-(BOOL)isFileNeedCreate:(NSString *)filePath{if( NO ==[[NSFileManager defaultManager] fileExistsAtPath:filePath] )
{return[[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil];
}returnNO;
}
3、添加：包括创建不存在的空文件
-(void) doAdd{
NSString*docPath=[self docPath];
NSLog(@"当前docment路径：\n%@",docPath);
NSString*dataFile=[docPath stringByAppendingPathComponent:@"docData.plist"];if(YES==[self isFileNeedCreate:dataFile]) {
NSLog(@"文件原先不存在，现已新建空文件！");
}else{
NSLog(@"文件已存在，无需创建！");
}
NSMutableDictionary*plistDic =[[NSMutableDictionary alloc ] init];//添加2个“单条记录”[plistDic setObject:@"shanghai"forKey:@"recordKey001"];
[plistDic setObject:@"beijing"forKey:@"recordKey002"];//添加2个“字典记录”[plistDic setObject:[NSDictionary dictionaryWithObjectsAndKeys:@"Jack",@"name",@"22",@"age",nil] forKey:@"dicKey001"];
[plistDic setObject:[NSDictionary dictionaryWithObjectsAndKeys:@"Tom",@"name",@"33",@"age",nil] forKey:@"dicKey002"];
[plistDic writeToFile:dataFile atomically:YES];//完全覆盖NSLog(@"添加内容完成！！");
}
运行结果：
对应路径下生成了新文件：
内容如下：
4、读取
-(void) doRead{
NSString*dataFile=[[self docPath] stringByAppendingPathComponent:@"docData.plist"];//读取所有内容NSDictionary* dic =[NSDictionary dictionaryWithContentsOfFile:dataFile];
NSLog(@"完整内容:\n%@",dic);//读取第一层“字典记录”NSDictionary* dicValue=[dic objectForKey:@"dicKey001"];
NSLog(@"读取第一层“字典记录”:\n%@",dicValue);//读取第一层“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“单条记录”NSLog(@"读取第一层“单条记录”:\nrecordKey001=%@",[dic objectForKey:@"recordKey001"]);
}
运行结果：
5、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);
}
运行结果：
6、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);
}
运行结果：
各个目录的获取：
http://www.cnblogs.com/ios-wmm/p/3299695.html
如果是操作 Resource下的plist文件，可由以下代码完成：只能读，不能写
-(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);
}
三、ios程序的“沙箱原理”
xcode6中的模拟器位置：
/Users/wuxiaofeng/资源库/Developer/
3个基本目录：
原理：
a）iTunes在与iPhone同步时，备份所有的Documents和Library文件。
b）iPhone在重启时，会丢弃所有的tmp文件。
参考：沙箱，路径获取，文件操作
http://www.cnblogs.com/dyllove98/archive/2013/07/30/3225955.html