在Swift和Objective-C之间切换时,使用lldb创建并呈现ViewController

如何以编程方式显示Swift ViewController ? 下面的命令可以工作,但我想展示的VC卡在 出现 出现 州政府?

第0步

class ydHiddenVC: UIViewController {
    override func viewDidLoad() {
        print("code executing in viewDidLoad")
    }
}

在AppDelegate开始时放置断点,其中lldb设置为Swift上下文。。。

(lldb) exp let $a = ydHiddenVC()
(lldb) po $a
<DELETE_PROV_PROFILE_MACHINE.ydHiddenVC: 0x7fa9f5d00ef0>
(lldb) continue

第2步

(lldb) e id $b = (id)0x7fa9f5d00ef0  // cast the Swift VC to something Objective-C can deal with
(lldb) po [[UIWindow keyWindow] rootViewController]
<UINavigationController: 0x7fa9f783e800>
(lldb) e id $rootvc = (id)0x7fa9f783e800
(lldb) po $rootvc
<UINavigationController: 0x7fa9f783e800>
(lldb) expression (void)[$rootvc pushViewController:$b animated:YES]
(lldb) caflush
code executing in viewDidLoad

摘要

当我的ViewDidLoad代码执行时,这看起来很成功。但是,ViewController看起来并不好。在转换过程中,它被卡在了屏幕的中间。与 Chisel pvc 命令,可以打印视图层次结构中的内容。这显示了我的问题:

(lldb) pvc
    <UINavigationController 0x7fa9f783e800>, state: appeared, view: <UILayoutContainerView 0x7fa9f5d10d10>
       | <DELETE_PROV_PROFILE_MACHINE.ydHomeVC 0x7fa9f5f0bc10>, state: disappearing, view: <UIView 0x7fa9f5d0e300>
       | <DELETE_PROV_PROFILE_MACHINE.ydHiddenVC 0x7fa9f5d00ef0>, state: appearing, view: <UIView 0x7fa9f5d14e10>