Question

AddBillViewController.h：

@protocol AddBillDelegate <NSObject>

- (void)addBillViewControllerDidAddOneBill;

@end

@interface AddBillViewController : UIViewController

@property (retain, nonatomic)id <AddBillDelegate> delegate;

@end

AddBillViewController.m：

- (IBAction)AddBill:(id)sender {

    [self.delegate addBillViewControllerDidAddOneBill];

    [self dismissViewControllerAnimated:YES completion:nil];
}

HomeViewController.m：

@interface HomeViewController () <AddBillDelegate>

@property (strong, nonatomic)AddBillViewController *abVC;

@end

@implementation HomeViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.abVC = [[AddBillViewController alloc] init];
    self.abVC.delegate = self;
}

- (void)addBillViewControllerDidAddOneBill {
    NSLog(@"Added a bill.");
}

@end

正如您所看到的，AddBillViewController中有一个按钮，当按下按钮时，将调用addBill方法，然后调用HomeViewController中的委托方法addBillViewControllerDidAddOneBill，但事实上，它没有按＆＃39;吨

Answer 1

我认为你没有在这一行中获得参考

self.abVC = [[AddBillViewController alloc] init];

如果您正在执行segue，例如AddBillViewController是您的下一个控制器，请在performSegue：function

中设置委托

像

AddBillViewController *vc = [segue destinationViewController];
[vc setDelegate:self];

委托方法不会被调用 - iOS

1 个答案: