在 ViewControllerB 到 ViewControllerA 之间传递数据，委托不会被调用

Question

我尝试使用委托但没有成功，委托没有被调用。 这是我的委托代码：

设置委托（ViewControllerB）

@class SearchGardenTable;
@protocol SearchGardenDelegate <NSObject>
- (void)addItemViewController:(SearchGardenTable *)controller didFinishWithGardenID:(NSString *)gardenID gardenName:(NSString*)gardenName andCityName:(NSString*)cityName;
@end

@interface SearchGardenTable : UITableViewController

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

告诉 VC B VC A 是它的代表：

 // in VC A viewDidLoad.
self.searchGarden = [[SearchGardenTable alloc]init];
[self.searchGarden setDelegate:self];

VC A 采用协议

@interface AddKid () <MZFormSheetBackgroundWindowDelegate,SearchGardenDelegate>

@end

@implementation AddKid 

设置我想从 VC B 传回 VC A 的参数：

    _kidGaedenID  = [temp objectAtIndex:indexPath.row];
    _kidGardenName = [temp1 objectAtIndex:indexPath.row];


    [self.delegate addItemViewController:self didFinishWithGardenID:_kidGaedenID gardenName:_kidGardenName andCityName:_kidCityName];

在VC A实现协议方法：

- (void)addItemViewController:(SearchGardenTable *)controller didFinishWithGardenID:(NSString *)gardenID gardenName:(NSString*)gardenName andCityName:(NSString*)cityName
{
    _kidGardenID = gardenID;
    _gardenName.text = gardenName;
    _kidCity.text = cityName;

}

编辑

ViewController B didSelectRowAtIndexPath: code

    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;

        NSArray *temp = [_responseDict valueForKey:@"ID"];
        NSArray *temp1 = [_responseDict valueForKey:@"name"];

        _kidGaedenID  = [temp objectAtIndex:indexPath.row];
        _kidGardenName = [temp1 objectAtIndex:indexPath.row];



        [[self delegate] addItemViewController:self didFinishWithGardenID:_kidGaedenID gardenName:_kidGardenName andCityName:_kidCityName];

        [self mz_dismissFormSheetControllerAnimated:YES completionHandler:^(MZFormSheetController *formSheetController) {

//dismiss the popup view which i create it VC A with that gitHub package:
https://github.com/m1entus/MZFormSheetController/issues/98

        }];

编辑 2 呈现 ViewControllerB 的代码：

- (IBAction)chooseGardenAndCityBtn:(id)sender {
    UIViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"modal"];

    MZFormSheetController *formSheet = [[MZFormSheetController alloc] initWithViewController:vc];

    formSheet.presentedFormSheetSize = CGSizeMake(300, 298);
    //    formSheet.transitionStyle = MZFormSheetTransitionStyleSlideFromTop;
    formSheet.shadowRadius = 2.0;
    formSheet.shadowOpacity = 0.3;
    formSheet.shouldDismissOnBackgroundViewTap = YES;
    formSheet.shouldCenterVertically = YES;
    formSheet.movementWhenKeyboardAppears = MZFormSheetWhenKeyboardAppearsCenterVertically;
    // formSheet.keyboardMovementStyle = MZFormSheetKeyboardMovementStyleMoveToTop;
    // formSheet.keyboardMovementStyle = MZFormSheetKeyboardMovementStyleMoveToTopInset;
    // formSheet.landscapeTopInset = 50;
    // formSheet.portraitTopInset = 100;

    __weak MZFormSheetController *weakFormSheet = formSheet;


    // If you want to animate status bar use this code
    formSheet.didTapOnBackgroundViewCompletionHandler = ^(CGPoint location) {
        UINavigationController *navController = (UINavigationController *)weakFormSheet.presentedFSViewController;
        if ([navController.topViewController isKindOfClass:[SearchCityTable class]]) {
            SearchCityTable *mzvc = (SearchCityTable *)navController.topViewController;
            mzvc.showStatusBar = NO;
        }


        [UIView animateWithDuration:0.3 animations:^{
            if ([weakFormSheet respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
                [weakFormSheet setNeedsStatusBarAppearanceUpdate];
            }
        }];
    };

    formSheet.willPresentCompletionHandler = ^(UIViewController *presentedFSViewController) {
        // Passing data
        UINavigationController *navController = (UINavigationController *)presentedFSViewController;
        navController.topViewController.title = @"בחר עיר";
    };
    formSheet.transitionStyle = MZFormSheetTransitionStyleCustom;

    [MZFormSheetController sharedBackgroundWindow].formSheetBackgroundWindowDelegate = self;

    [self mz_presentFormSheetController:formSheet animated:YES completionHandler:^(MZFormSheetController *formSheetController) {

    }];



}

编辑

Answer 1

你在做

self.searchGarden = [[SearchGardenTable alloc]init];

但是您说您在情节提要中有您的视图控制器。这让我觉得 self.searchGarden 在 vi​​ewDidLoad: 的角度是与故事板中的不同的对象。

当您准备推送您的 VC B 或执行 TheSegue 之前（如果您正在使用 segue），您应该为 self.searchGarden 分配一个对象。

编辑

根据您的代码，我假设

UIViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"modal"];

是你的VC B，所以你需要做vc.delegate = self; 请记住，您的 vc 必须是 VC B 类型，在您的情况下是 SearchGardenTable

编辑 2

鉴于当前的设置，我现在想到的最快的解决方案是 NSNotification。从您的 VC B 发送通知：

[[NSNotificationCenter defaultCenter] postNotificationName:@"userDidTapOnCell" object:nil userInfo:dictionaryOfObjects];

使用从模型中检索到的对象初始化对象字典的位置，例如：

NSDictionary *dictionary = @{ @"gardenID": _kidGaedenID, @"gardenName": _kidGardenName };

与在 VC A 中相比，您将自己作为观察者添加到 viewDidLoad 上的通知中：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(gardenInfoDidComeBack:) name:@"userDidTapOnCell" object:nil];

并实现方法：

- (void)gardenInfoDidComeBack:(NSNotification *)notification {
    NSDictionary *userInfo = notification.userInfo;
    // retrieve the kidGardenID and kidGardenName from the dict and use them as you whish.
}

希望这可以帮助您完成任务。您的导航架构可能不是最好的，但这已经超出了本主题的范围。

Answer 2

请出示您的 VC B 初始化。

在调用此行之前确保 self.searchGarden 已初始化

self.searchGarden.delegate = self; // in VC A viewDidLoad.

Answer 3

远射，但你试过了吗：

 [[self delegate] addItemViewController:self didFinishWithGardenID:_kidGaedenID gardenName:_kidGardenName andCityName:_kidCityName]];

而不是

 [self.delegate addItemViewController:self didFinishWithGardenID:_kidGaedenID gardenName:_kidGardenName andCityName:_kidCityName];

Answer 4

我从您的查询和疑虑中了解到我发现了一些东西

   UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

    searchVC = (ControllerA *)[storyboard instantiateViewControllerWithIdentifier:@"controllerA"];
    searchVC.delegate = self;

    [self.navigationController pushViewController:searchVC animated:YES];

希望对你有帮助:)