如何使用 swift Viewcontroller 通过编写代码打开 objective-c Viewcontrollerv 页面？

Question

The error log like below

2021-06-03 09:59:16.251029+0800 testing2[7167:2095191] [Storyboard] Unknown class _TtC8testing218NextViewController in Interface Builder file. Could not cast value of type 'UIViewController' (0x1d8c46428) to 'NextViewController' (0x102a90c50). 2021-06-03 09:59:16.252513+0800 testing2[7167:2095191] Could not cast value of type 'UIViewController' (0x1d8c46428) to 'NextViewController' (0x102a90c50). (lldb)

There is a link for my demo detail https://drive.google.com/file/d/1LcY3hb3yGYf_3bZpo6qnvZPMviVp2Jft/view?usp=sharing

I am a noob, please detail to say the step~ Thank you

Answer 1

Solution 1

You can't use pushViewController without navigationController .
If you want you code will work, you need add navigationController to you ViewController .
Click to your ViewController -> in upper menu select Editor -> choose Embed In -> Navigation Controller .

Solution 2

Add Show segue to your NextViewController .

Then rename to nextSegue and change kind to Present Modally and set presentation to Full Screen .

In your ViewController :

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    @IBAction func btn_next(_ sender: UIButton) {
        performSegue(withIdentifier: "nextSegue", sender: nil)
    }
    

}

Answer 2

Swift class name has module name as prefix, Make sure your ViewController and NextViewController both tick Inherit Module From Target with same module name in storyboard, giving the NextViewController a identifier call next , and you can do the following code.

@IBAction func btn_next(_ sender: UIButton) {
    
    guard let next = self.storyboard?.instantiateViewController(identifier: "next") as? NextViewController else {
        print("next is uninitialized")
        return
    }
    self.present(next, animated: true, completion: nil)
}