ios - 从 viewcontroller 移动到 VC 时崩溃

Question

我有一个主屏幕。我以编程方式创建两个带有 Action 的按钮。一个将转到注册屏幕，另一个将转到登录屏幕。

我添加了登录和注册 Storyboard身份。但是，当我从那个家庭 VC 转到登录 VC 并注册 VC 时，我遇到了崩溃:

 -[ViewController pressSignUp:]: unrecognized selector sent to instance 0x7fbb3a72e3f0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ViewController pressSignUp:]: unrecognized selector sent to instance 0x7fbb3a72e3f0'
*** First throw call stack:

这是我的代码:

// create button 1
    UIButton* button = [[UIButton alloc] initWithFrame:CGRectMake(0.0, self.view.frame.size.height-50, self.view.frame.size.width/2 , 50.0)];

    [button setBackgroundColor:[UIColor colorWithRed:188/255.0f green:155/255.0f blue:211/255.0f alpha:0.6f]];
    [button setTitle:@"Sign Up" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(pressSignUp:) forControlEvents:UIControlEventTouchUpInside];

    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; // title color
    [self.view addSubview:button];

  // Button Two
   UIButton* button1 = [[UIButton alloc] initWithFrame:CGRectMake(self.view.frame.size.width/2, self.view.frame.size.height-50, self.view.frame.size.width/2 , 50.0)];

   [button1 setBackgroundColor:[UIColor colorWithRed:188/255.0f green:155/255.0f blue:211/255.0f alpha:0.6f]];
    [button1 setTitle:@"Sign In" forState:UIControlStateNormal];
    [button1 addTarget:self action:@selector(pressSignIn:) forControlEvents:UIControlEventTouchUpInside];

    [button1 setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; // title color
    [self.view addSubview:button1];

    // Border color for one button
    UIView *leftBorder = [[UIView alloc] initWithFrame:CGRectMake(0, 1, 1, button.frame.size.height)];
    leftBorder.backgroundColor = [UIColor colorWithRed:237/255.0f green:211/255.0f blue:246/255.0f alpha:0.6f];
    [button1 addSubview:leftBorder];

    -(void)pressSignUp

    {
        UIViewController *secondViewController =
        [self.storyboard instantiateViewControllerWithIdentifier:@"SignUpViewController"];
        [self presentModalViewController:secondViewController animated:YES];
        // Here You can write functionality

    }


-(void)pressSignIn

{
    UIViewController *secondViewController =
    [self.storyboard instantiateViewControllerWithIdentifier:@"SignInViewController"];
    [self presentModalViewController:secondViewController animated:YES];
    // Here You can write functionality

}

为什么我会崩溃。有可能转到另一个 Vc。

请帮忙谢谢

Answer 1

您忘记为发送者实现参数:

-(void)pressSignUp:(UIButton*) sender {
    }
-(void)pressSignIn:(UIButton*) sender {
    }

也许您没有在界面构建器中设置标识符:

它位于 IB 中的身份检查器选项卡下。它被称为“ Storyboard ID”。例如:SignUpViewController