1. 创建plist文件路径(一般保存到沙盒document文件夹中)

//获取plist文件路径
NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsPath = [path objectAtIndex:0];
    NSString *plistPath = [documentsPath stringByAppendingPathComponent:@"user_phone.plist"];

2.根据路径,创建或者取出plist文件内容(如果是数组用NSMutableArray去接,如果是字典就用NSMutableDictionary去接)

//比如说根容器是个数组(字典同理)
NSMutableArray * plistArray =nil;
    if (![[NSMutableArray alloc]initWithContentsOfFile:plistPath]) {
        //创建一个根容器为数组的plist文件
        plistArray = [NSMutableArray array];
        [plistArray writeToFile:plistPath atomically:YES];
    }else{
        plistArray = [[NSMutableArray alloc] initWithContentsOfFile:plistPath];
    }

3.关于plsit文件的一些操作(其实就是操作数组或字典,然后写入plist)

• 添加一条数据(以添加账号密码为例)

NSMutableDictionary * newsDict = [NSMutableDictionary dictionary];
    [newsDict setObject:@"1234567890" forKey:@"user_phone"];
    [newsDict setObject:@"123" forKey:@"user_pass"];
    [plistArray addObject:newsDict];
    [plistArray writeToFile:plistPath atomically:YES];

• 修改一条数据

for (NSDictionary * dict in plistArray) {
        if ([dict[@"user_phone"] isEqualToString:userPhone]) {
            [dict setValue:userPass forKey:@"user_pass"];
            [plistArray writeToFile:plistPath atomically:YES];
             NSLog(@"%@",plistArray);
            return;
        }
    }

• 删除一条数据

NSMutableArray * plistArray = [[NSMutableArray alloc] initWithContentsOfFile:plistPath];
        for (int i = 0; i < plistArray.count; i++) {
            NSDictionary * dict = plistArray[i];
            if ([dict[@"user_phone"] isEqualToString:userPhone]) {
                [plistArray removeObject:dict];
                [plistArray writeToFile:plistPath atomically:YES];
            }
}