iphone - 使用segue将数据传回时卡住

我正在尝试使用协议通过segue传回数据。我正在关注这个答案:How to Pass information Back in iOS when reversing a Segue?

所以我已经做了:

PageScrollViewController.h

@protocol MyDataDelegate <NSObject, UIPageViewControllerDelegate>

- (void)recieveData:(NSString *)theData;

@end

并且我还添加了该属性:

@property (nonatomic,weak) id<MyDataDelegate> delegate;

ContainerViewController.h

#import "PageScrollViewController.h"

@interface ContainerViewController : UIViewController <MyDataDelegate>

//...

ContainerViewController.m

- (void)recieveData:(NSString *)theData {

    //Do something with data here
}

在这里我被卡住了:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{

    //Get a handle on the view controller about be presented
    PageScrollViewController *secondViewController = segue.destinationViewController;

    if ([PageScrollViewController isKindOfClass:[PageScrollViewController class]]) {
        PageScrollViewController.delegate = self;
    }
}

PageScrollViewController.delegate = self;行给出了一个错误:在类型'PageScrollViewController'的对象上找不到属性'delegate'，但是我确实将其添加为属性并对其进行了合成...

最佳答案

您正在尝试对 [PageScrollViewController setDelegate:] 类型的对象(在本例中为Class)调用实例方法(PageScrollViewController)。

尝试以下操作:

更换

PageScrollViewController *secondViewController = segue.destinationViewController;

  if ([PageScrollViewController isKindOfClass:[PageScrollViewController class]]) {
    PageScrollViewController.delegate = self;
  }

用

PageScrollViewController *secondViewController = segue.destinationViewController;

  if ([secondViewController isKindOfClass:[PageScrollViewController class]]) {
    secondViewController.delegate = self;
  }