Ios VC被解雇时如何调用委托人？

我有两个。当第二个VC被解除时，我需要调用委托函数

在我的第一个VC或主VC中，我在.h文件中给出了以下代码

@interface FirstVC : ....<SecondVCDelegate>
-(void)didDismissViewController:(UIViewController*)vc;

在第二个VC.h文件中

@protocol SecondVCDelegate <NSObject>
 - (void)didDismissViewController:(UIViewController*)vc;
@end

@interface SecondVC : ...
 @property (nonatomic) id<SecondVCDelegate> delegate;
@end

---

你能解释一下我做错了什么吗。提前感谢。

这是xcode 9上的工作代码：

ViewController.m：

#import "ViewController.h"
#import "SecondViewController.h"
@interface ViewController () <SecondVCDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)action:(id)sender {
    SecondViewController *optionsVC = [self.storyboard instantiateViewControllerWithIdentifier:@"SecondViewController"];
    optionsVC.delegate = self;
    optionsVC.view.backgroundColor = [UIColor blackColor];
    optionsVC.modalPresentationStyle = UIModalPresentationOverFullScreen;
    [self presentViewController:optionsVC animated:YES completion:nil];
}

-(void) didDismissViewController:(UIViewController *)vc{
    NSLog(@"working controller : %@", vc);
}
@end

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)didmissAction:(id)sender {
    [self dismissViewControllerAnimated:true completion:^{
        [_delegate didDismissViewController:self];
    }];
}

@end

---

在你的第二次风险投资中，我喜欢这样做

首先在实现下面合成委托

@synthesize delegate;

之后，在viewController上使用它：

[self dismissViewControllerAnimated:YES completion:^{

    [self.delegate didDismissViewController: self];
}];

---

您可以在第二个VC的完成块中调用它，当您解除view@RahulGUsai如何？？在第二个VC中调用委托方法的位置？例如[self-dismissViewControllerAnimated:YES completion:^{call delegate here}]@拉胡古赛：我已经试过了，但我需要解雇这第二位VC，转而成为新的VC。但由于某些原因，它不起作用。@syntesize做什么？试图使委托属性变弱<代码>@property（弱，非原子）id委托可以避免保留循环。

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)didmissAction:(id)sender {
    [self dismissViewControllerAnimated:true completion:^{
        [_delegate didDismissViewController:self];
    }];
}

@end

@synthesize delegate;

[self dismissViewControllerAnimated:YES completion:^{

    [self.delegate didDismissViewController: self];
}];