- 首先新建一个ViewController,通过file->new file,选择Cocoa Touch Class,名字例如为TmpViewController, 基类为UIViewController,注意勾选xib,启动时要用到:
在主ViewController中添加一个按钮,通过按钮启动TmpViewController:
- (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 <UIKit/UIKit.h>
#import "ViewController.h"
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@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:
再看我们的跳转接口:
- (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
来源:CSDN
作者:dingpwen
链接:https://blog.csdn.net/dingpwen/article/details/104425984