ios - 将GestureRecognizer添加到由swift3中的storyboard创建的UILable时出现: EXC_BAD_INSTRUCTION(code=EXC_I386_INVOP, subcode=0x0)错误

Question

我创建了一个名为addFont的UILable，并手动向它添加addGestureRecognizer，但是出现了一个不熟悉的错误:

EXC_BAD_INSTRUCTION(代码=EXC_I386_INVOP，子代码=0x0)

我的代码如下:

vc9:

 @IBAction func gotoVC(_ sender: AnyObject) {

    var vc10 = ViewController10()
    self.navigationController!.pushViewController(vc10, animated: true)
}

vc10:

@IBOutlet weak var addBigger: UILabel!
var fontSizeNum:Int = 22
override func viewDidLoad() {
    super.viewDidLoad()

    initData()
}

// MARK: - init
func initData() -> Void {

    let tap = UITapGestureRecognizer.init(target: self, action: #selector(addFont(sender:)))
    addBigger.addGestureRecognizer(tap) // the error occured
}

Answer 1

那么!经过多次思考，我终于发现 vc9 的代码:var vc10 = ViewController10() 它创建了一个 vc10 而不是来自 Storyboard，因此 addBigger 标签为 nil，它是错误的来源。

解决办法是:

将 var vc10 = ViewController10() 更改为

let sb = UIStoryboard.init(name: "Main", bundle: nil)
let vc10 = sb.instantiateViewController(withIdentifier: "ViewController10")