Swift presentViewController没有navigationController
我向下一个视图的转换如下所示:Swift presentViewController没有navigationController,swift,navigationcontroller,presentviewcontroller,Swift,Navigationcontroller,Presentviewcontroller,我向下一个视图的转换如下所示: if let navigationController = navigationController { if let storyboard:UIStoryboard = UIStoryboard(name: "myStoryboard", bundle: nil) { if let vc = storyboard.instantiateViewControllerWithIdentifier("myViewControl
if let navigationController = navigationController {
if let storyboard:UIStoryboard = UIStoryboard(name: "myStoryboard", bundle: nil) {
if let vc = storyboard.instantiateViewControllerWithIdentifier("myViewController") as? MyViewController {
dispatch_async(dispatch_get_main_queue()) {
navigationController.presentViewController(vc, animated: true, completion: nil)
}
}
}
}
这个很好用。我想要这种过渡。但当我在MyViewController中调用以下代码时,NavigationController为nil:
if let navigationController = navigationController {
print("yeah i have a nc")
} else {
print("its nil") //this will call
}
当我使用navigationController.pushViewController时(vc,动画:true)
一切正常。但我真的很想过渡。这是我的错误实现还是presentViewController
总是没有导航控制器?如果是,我能做什么
我的控制器A已嵌入navigationController中。我使用navigationController.presentViewController转到MyViewController。我想从MyViewController推送到下一个ViewController C.解决方案,该解决方案适合我 我不知道为什么,但是当您使用presentViewController时,必须为navigationController定义一个新的(?)根 在这种情况下,我理解了艾哈迈德的回答
if let storyboard:UIStoryboard = UIStoryboard(name: "myStoryboard", bundle: nil) {
if let vc = storyboard.instantiateViewControllerWithIdentifier("MyViewController") as? MyViewController {
if let navController:UINavigationController = UINavigationController(rootViewController: vc) {
dispatch_async(dispatch_get_main_queue()) {
self.presentViewController(navController, animated:true, completion: nil)
}
}
}
}
SWIFT 3
let storyboard = UIStoryboard(name: UIConstants.Storyboards.registration, bundle: nil)
if let vc = storyboard.instantiateViewController(withIdentifier: "YourViewControllerIdentifier") as? YourViewController {
let navigationController = UINavigationController(rootViewController: vc)
DispatchQueue.main.async {
navigationController.present(vc, animated: true)
}
}
我找到了“我的”解决方案是否要显示与navigationController连接的viewController?所以,在演示之后,你可以推动和弹出。。。是这样吗?是的,是这样。我的控制器A已嵌入navigationController中。我使用navigationController.presentViewController获取MyViewController。从MyViewController我想推到下一个ViewControllerSo,我假设如果您试图从显示的控制器导航到另一个viewController,它将显示而不是推,对吗?你说“它将显示而不是推”是什么意思?当我用推的时候,一切都很好。我在下一个VC中有一个navigationController。当我使用presentViewController时,我没有。对不起,我更改了它