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- (IBAction)jump:(id)sender { NSLog(@"jump to new view"); TmpViewController *tvc = [[TmpViewController alloc]initWithNibName:@"TmpViewController" bundle:nil]; [self.navigationController pushViewController:tvc animated:YES]; //[self presentViewController:tvc animated:YES completion:nil];}
我们可以发现,可以通过presentViewController 启动新的界面,但是却无法通过navigationController 来启动新页面,这是因为默认情况下,navigationController是nil的,需要设置应用的navigationController,同时设置首页(主view):
AppDelegate.h中修改为:#import#import "ViewController.h"@interface AppDelegate : UIResponder @property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) ViewController *viewController;@property (strong, nonatomic) UINavigationController *navController;@end
AppDelegate.m的didFinishLaunchingWithOptions中添加:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]]; //self.viewController = [[ViewController alloc]init]; UIStoryboard *mainStory = [UIStoryboard storyboardWithName:@"Main" bundle:nil]; self.viewController = [mainStory instantiateViewControllerWithIdentifier:@"ViewController"]; UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:self.viewController]; self.window.rootViewController = navi; [self.window makeKeyAndVisible]; return YES;}
这里需要注意的是,xcode9默认的viewcontroller是没有xib的,想要的UI是Main.storyboard,所以要通过UIStoryboard来初始化viewController,注意大小写,同时在Main.storyboard中注意添加Identifier名称:
- (IBAction)jump:(id)sender { NSLog(@"jump to new view"); TmpViewController *tvc = [[TmpViewController alloc]initWithNibName:@"TmpViewController" bundle:nil]; [self.navigationController pushViewController:tvc animated:YES]; //[self presentViewController:tvc animated:YES completion:nil];}
这里initWithNibName,这里对应的是xib,如果没有xib,会直接异常,这也是为什么AppDelegate不用initWithNibName来初始化主view的原因。
参考:
https://blog.csdn.net/u012605629/article/details/52122586