Objective C编码错误

Question

我收到错误＆amp;使用未声明的标识符'照片'使用未声明的标识符'pic'

这是我的代码

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];

    photos = [[NSMutableArray alloc] init];
                               Use of undecleared idenifier 'photos'


    Photo *pic = [[Photo alloc] init];
    [pic setName:@"Aston Martin"];   Use of undecleared idenifier 'pic'
    [pic setFilename:@"Aston Martin DB6.jpg"]; Use of undecleared idenifier 'pic'
    [pic setNotes:@"Red is my favorite color."]; Use of undecleared idenifier 'pic'

    [photos addObject:pic];
}

Answer 1

你需要让操作系统知道哪种变量照片是这样的：

NSMutableArray *photos = [[NSMutableArray alloc] init];

Answer 2

您不会显示正在宣布的照片，而这正是您的第一条错误消息所抱怨的。