Question

我搜索过StackOverflow和google，但仍然卡住了。任何帮助或代码片段都表示赞赏！

所以，我看到的问题是我的委托仅在从自定义视图控制器类的第一个实例（AddJobViewController基于UIKit.h）调用时才响应。从第一个视图调用时它工作正常，但是当第二个视图调用时，委托返回null。无论我哪个视图都能正确分配代理。我在故事板中有两个分配了这个自定义类的视图。

以下是授权代码：

ATableViewController.h：

#import "AddJobViewController.h"

@interface ATableViewController : UITableViewController <AddJobViewControllerDelegate, NSFetchedResultsControllerDelegate>

ATableViewController.m：

- (void)AddJobViewControllerSave {
    NSError *error = nil;
    NSManagedObjectContext *context = self.managedObjectContext;
    if (![context save:&error]) {
        NSLog(@"Error! %@", error);
    }
}

ATableViewController.m：

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

    if ([[segue identifier] isEqualToString:@"addJob"]) {
        AddJobViewController *ajvc = (AddJobViewController *)[segue destinationViewController];
        ajvc.delegate=self;

        AJobDetails *newJob = (AJobDetails *) [NSEntityDescription insertNewObjectForEntityForName:@"AJobDetails" inManagedObjectContext:[self managedObjectContext]];

        ajvc.currentJob = newJob;
    }
}

AddJobViewController.h：

#import "AJobDetails.h"

@protocol AddJobViewControllerDelegate;

@interface AddJobViewController : UIViewController

- (IBAction)save:(id)sender;
- (IBAction)next:(id)sender;

@end

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

@property (nonatomic, strong) AJobDetails *currentJob;

@protocol AddJobViewControllerDelegate
-(void)AddJobViewControllerSave;
-(void)AddJobViewControllerNext;
-(void)AddJobViewControllerDidCancel:(AJobDetails *)jobToDelete;

@end

AddJobViewController.m：

- (IBAction)save:(id)sender {


    [self.currentJob setThresholdTrimText:thresholdText.text];

NSLog(@"PVC Delegate: %@",self.delegate);
    [self.delegate AddJobViewControllerSave];
}

Core Data上下文正在传递给两个视图并正常工作。

当从第二个视图调用时，Delegate以NULL响应

0 个答案: