用UIButton实现页面跳转（AppDelegate ＋NavigationViewController）

1.AppDelegate.h

定义一个UINavigationController

#import <UIKit/UIKit.h>

#import "MainViewController.h"

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@property (strong, nonatomic) UINavigationController *navigationCotroller;

@end

2.AppDelegate.m

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];//实例化window

MainViewController *mainViewController = [[MainViewController alloc]init];//实例化mainView控制器

//把mainView控制器放到navigationController的方法中，使之成为根控制器

_navigationCotroller = [[UINavigationController alloc] initWithRootViewController:mainViewController];

[_window addSubview:_navigationCotroller.view];//window中加载导航控制器的view

[self.window makeKeyAndVisible];//视图可见

return YES;

}

3.mainViewController.m

设置按钮的页面，按钮触发的方法中，调用AppDelegate中的导航控制器的pushViewController方法，实现页面跳转（自动生成有返回健的页面）。

按钮触发的方法：

[_logonBtn addTarget:self action:@selector(loginClick:) forControlEvents:UIControlEventTouchUpInside];

页面跳转：

-(void)loginClick:(id)sender{

LogonViewController *logonView = [[LogonViewController alloc]init];

AppDelegate *myDelete = [[UIApplication sharedApplication]delegate];

[myDelete.navigationCotroller pushViewController:logonView animated:YES];

}