学步园

以name，phoneNumber，age三个字段为例。 iPhone 在文本框中输入数据，获取后装入数组中，然后把数组写入.plist文件

写操作

    NSString *name=[txt1 text];
    NSNumber *phoneNumber=[[NSNumber alloc] initWithInt:[[txt2 text] intValue]];
    NSNumber *age=[[NSNumber alloc] initWithInt:[[txt3 text] intValue]];

    NSMutableArray *array=[[NSMutableArray alloc]init];
    [array  addObject:name];
    [array  addObject:phoneNumber];
    [array  addObject:age];

    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    NSString *path=[paths    objectAtIndex:0];
    NSString *filename=[path stringByAppendingPathComponent:@"personal.plist"];    

    [array writeToFile:filename  atomically:YES];
    [array release];   



读操作

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    NSString *path=[paths    objectAtIndex:0];
    NSString *filename=[path stringByAppendingPathComponent:@"personal.plist"];

    NSMutableArray *array=[[NSMutableArray alloc] initWithContentsOfFile:filename];

    txt1.text=[array objectAtIndex:0];
    txt2.text=[[NSString alloc] initWithFormat:@"%d",[[array objectAtIndex:1]intValue]];
    txt3.text=[[NSString alloc] initWithFormat:@"%d",[[array objectAtIndex:2]intValue]];

    [array release];

要点：在论坛里面下载了写入plist的demo,发现工程中的plist文件并没有被更改。这个是用来保存临时数据的吗？没有写入app中吗？

建议以后不明白的同学把这个path打印出来就明白来了