错误:在“id"类型的对象上找不到属性“data" [英] Error: property 'data' not found on object of type 'id'

问题描述

我在 titleFieldValueChanged 方法中收到此错误，当用户更改文本字段的值以更新数据模型时会调用该方法.

I get this error in the method titleFieldValueChanged which is called when the user changes the value of the text field to update the data model.

在DetailViewController.m中:

In DetailViewController.m:

- (IBAction)titleFieldTextChanged:(id)sender
{ 
    self.detailItem.data.title = self.titleField.text;
}

我知道我必须用括号表示法来写这个，对吗?但我不知道该怎么做.

I know I have to write this in bracket notation, correct? But I can't figure out how to do that.

推荐答案

在继续之前查看您的代码(我稍微更改了它 - 做同样的事情).您发送的代码在尝试从 master 转至 detail 时崩溃.这些是我发现的更大的问题.

Looking at your code, before you segue (i changed it slightly - does same thing) . The code you sent crashes, when trying to segue from master to detail. These are the bigger issues I found.

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"showDetail"]) {
        DetailViewController *dvc = segue.destinationViewController;
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        NSDate *object = _exercises[indexPath.row];
        dvc.detailItem = object;
    }
}

// in detail view
@property (strong, nonatomic) NSDate *detailItem;

你传递给细节视图控制器的对象"是一个 NSDate 对象.

Your "object" that you are passing to the detail view controller is a NSDate object.

不能为 NSDate 对象设置标题.

You cannot set a title to a NSDate object.

你做的时候也有问题

[[self detailItem] setFullImage:fullImage];
[[self detailItem] setThumbImage:thumbImage];

再次尝试将图像设置为 NSDate 对象.

Again your trying to set an image to your NSDate object.

我建议您按照本教程进行操作，它将展示您正在尝试制作的内容的一个很好的示例，正​​如您提到的，您是初学者.

I suggest you follow along with this tutorial, it will show a good example of what you are trying to make, as you mentioned you are a beginner.

iOS 教程: 如何创建一个简单的 iPhone 应用程序

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