xcode 故事板 - 设置代表
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Storyboard - setting delegates
提问by Morrowless
Before storyboards I was able to set delegates and datasources just by dragging an outlet to a class. With storyboards, I cannot drag the outlet to another view controller; there is no destination that will respond to it.
在故事板之前，我只需将一个插座拖到一个类中就可以设置委托和数据源。使用故事板，我无法将插座拖到另一个视图控制器；没有目的地会响应它。
If I click on a view controller object, I am able to see the class owner at the bottom, but as soon as I select the other view controller containing the outlet, the old selection is gone, so I cannot connect the two.
如果我点击一个视图控制器对象，我可以在底部看到类所有者，但是一旦我选择了另一个包含插座的视图控制器，旧的选择就消失了，所以我无法连接两者。
Is this Apple's way of saying we should only connect them programmatically?
这是 Apple 的说法，我们应该只以编程方式连接它们吗？
回答by Marco
Correct. Set the delegate or other data in your prepareForSegue:sender:method. Here is an example:
正确的。在您的prepareForSegue:sender:方法中设置委托或其他数据。下面是一个例子：
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Check the segue identifier
if ([segue.identifier isEqualToString:@"showDetail"])
{
// Get a reference to your custom view controller
CustomViewController *customViewController = segue.destinationViewController;
// Set your custom view controller's delegate
customViewController.delegate = self;
}
}
回答by kazi.munshimun
If your storyboard segue destination View Controller is an UIViewController then @Marco answer is right. But if your destination View Controller is a UINavigationViewController then you have to get the UIViewController from UINavigationViewController :
如果您的故事板转场目标视图控制器是 UIViewController，那么@Marco 的答案是正确的。但是如果你的目标视图控制器是 UINavigationViewController 那么你必须从 UINavigationViewController 获取 UIViewController ：
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Check the segue identifier
if ([segue.identifier isEqualToString:@"chooseCategoryType"])
{
// Get a reference of your custom view controller if your segue connection is an UIViewController
// CustomViewController *customViewController = segue.destinationViewController;
// Get a reference of your custom view controller from navigation view controller if your segue connection is an UINavigationViewController
CustomViewController *customViewController = [[[segue destinationViewController] viewControllers] objectAtIndex:0];
// Set your custom view controller's delegate
customViewController.delegate = self;
}
}
