代码如下:

//在XYZtodoItem类的属性如下:

@property NSString *itemName;

//在XYZtodoListTableViewController中载入数据如下:

#import "XYZtodoItem.h"

-(void)ViewDidLoad{
    [super viewdidLoad];
    self.todoItems = [[NSMutable alloc] init];

    xyzTodoItem *item1 = [[xyzTodoItem alloc] init];
    [item1 setItemName:@"hello1"];
    [self.todoItems addObject:item1];
}

...

运行,出错,报错语句在main文件中:

@autoreleasepool{
    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}

控制器提示错误为:

[xyzTodoItem isEqualToString:]: unrecognized selector sent to instance 0x7f9e60445fb0

是哪里出了问题呢?是不是self的用法出了问题?