实际错误是 Cannot convert value of type 'UIViewController' to type 'UINavigationController' in coercion
在搜索到导航之前，先在视图控制器的代码中。视图控制器我准备中有以下代码
override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
if (segue.identifier == "SegueAfterJoin2") {
// NOTE! THIS IS TWEAKED with "as UINavigationController"
var nextViewCont:DashboardNavViewController = segue.destinationViewController as UINavigationController;
// PASS VARS FROM THIS VIEW TO NEXT
nextViewCont.passedPassword_toViewDashboard = passedPassword_toView2
nextViewCont.passedEmail_toViewDashboard = passedUsername_toView2
nextViewCont.passedUsername_toViewDashboard = passedEmail_toView2
nextViewCont.passedFocus_toViewDashboard = selectedFocus
}
}
我的导航 视图控制器类被定义为这样的：class DashboardNavViewController: UIViewController {。是否应该将其声明为其他内容？
只需更换
var nextViewCont: DashboardNavViewController = segue.destinationViewController as UINavigationController
和
var nextViewCont = segue.destinationViewController as! DashboardNavViewController
而且，如果您要呈现，UINavigationController那么您DashboardNavViewController的子类必须UINavigationController是现在的子类，UIViewController因此您不能UINavigationController像错误所说的那样进行强制转换。
而且您的导航视图控制器类应如下所示进行删除：
class DashboardNavViewController: UINavigationController {
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我来说两句