iphone读写plist文件

文件中有3项内容：username，password，number

 

读取时都是一次读出所有的内容，然后再从中选取想要的那项，写入数据的时候也是要将所有的数据一起写进文件，因此修改某一项后都要进行一次写文件

 

 

 

-(void)readInfo {isread = YES;NSArray *paths=NSSearchPathForDirectoriesInDomains（NSDocumentDirectory,NSUserDomainMask,YES); NSString *path=[paths objectAtIndex:0]; NSString *filename=[path stringByAppendingPathComponent:@"user.plist"];NSMutableDictionary *dict=[[NSMutableDictionary alloc] initWithContentsOfFile:filename];username = [dict objectForKey:@"username"];password = [dict objectForKey:@"password"];number = [dict objectForKey:@"number"];}-(void)writeInfo {NSData *data=[[NSMutableDictionary alloc] init];[data setValue:username forKey:@"username"];[data setValue:password forKey:@"password"];[data setValue:number forKey:@"number"]; NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES); NSString *path=[paths objectAtIndex:0]; NSString *filename=[path stringByAppendingPathComponent:@"user.plist"]; [data writeToFile:filename atomically:YES]; [data release];}