为什么gdb忽略中断条件？

Question

我正在使用gdb调试Qt gui应用程序。 该应用程序跨两个屏幕，在第一个屏幕上按下鼠标时需要中断，我这样设置断点：

class ViewController: UIViewController {

    var currentViewController: UIViewController? = nil

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let vctrl2 = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "viewcontroller2") as! ViewController2
        vctrl2.delegate = self
        self.view.addSubview(vctrl2.view)
        self.addChild(vctrl2)
        self.currentViewController = vctrl2
    }

    func openTargetViewController(vctrl: UIViewController) {
        guard let currVCtrl = self.currentViewController else {
            return
        }
        let oldVCtrl = self.currentViewController!

        if currVCtrl != vctrl {
            self.currentViewController = vctrl
        }

        self.view.addSubview(self.currentViewController!.view)
        self.addChild(self.currentViewController!)

        var frame = self.currentViewController!.view.frame
        frame.origin.y = UIScreen.main.bounds.size.height
        self.currentViewController!.view.frame = frame
        self.currentViewController!.view.alpha = 0

        UIView.animate(withDuration: 5.0, animations: { [weak self] in
            frame.origin.y = 0
            self!.currentViewController!.view.frame = frame
            self!.currentViewController!.view.alpha = 1
        }) { (finished) in
            oldVCtrl.view.removeFromSuperview()
            oldVCtrl.removeFromParent()
        }
    }
}

extension ViewController: VCtrl2Delegate {
    func openVCtrl2() {
        let vctrl3 = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "viewcontroller3") as! ViewController3
        vctrl3.delegate = self
        self.openTargetViewController(vctrl: vctrl3)
    }
}

extension ViewController: VCtrl3Delegate {
    func openVCtrl3() {
        let vctrl2 = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "viewcontroller2") as! ViewController2
        vctrl2.delegate = self
        self.openTargetViewController(vctrl: vctrl2)
    }
}

但是，无论e-> globalPos.xp如何更改，gdb总是会打破这一点！ 即使我打印了表达式并且显示为false，中断仍然有效。 有帮助吗？