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问题： single view application中删除默认的scene，创建导航视图不能显示
描述:
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var navigationcontr:UINavigationController?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
let mainSB = UIStoryboard(name: "Main", bundle: nil)
self.navigationcontr = mainSB.instantiateViewControllerWithIdentifier("test") as? UINavigationController
self.window?.rootViewController = navigationcontr
return true
}
｝
解决方案1:
描述:
Navigation
如题，在xcode 7.3中创建的single view application后，删除了默认的scene,然后拖动一个UINavigationController到SB，这时生成两个场景，其中一个是UINavigationController的实例（ID：test），另一个是UITableViewController的实例，此时编写AppDelegate.swift文件，大致如下(省略了其它默认方法)：程序能运行，但是显示为黑屏class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var navigationcontr:UINavigationController?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
let mainSB = UIStoryboard(name: "Main", bundle: nil)
self.navigationcontr = mainSB.instantiateViewControllerWithIdentifier("test") as? UINavigationController
self.window?.rootViewController = navigationcontr
return true
}
｝
解决方案1:
self.window makekeyandvi啥的把这句话写上，swift忘了这句话咋写，建议先把OC学好