#import @interface AppDelegate : UIResponder @property (strong, nonatomic) UIWindow *window;@end
/** * 通知在一对多的时候使用，从性能考虑一对一时不建议使用 */#import "AppDelegate.h"#import "RootViewController.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; self.window.backgroundColor = [UIColor whiteColor]; //初始化导航控制器 UINavigationController *navi = [[UINavigationController alloc] initWithRootViewController:[[RootViewController alloc] init]]; self.window.rootViewController = navi; [self.window makeKeyAndVisible]; return YES;}@end #import @interface RootViewController : UIViewController@end
#import "RootViewController.h"#import "LFViewController.h"@interface RootViewController ()@property(nonatomic, strong) UILabel *messageLabel ;@end@implementation RootViewController- (void)viewDidLoad { [super viewDidLoad]; //添加按钮 UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; button.frame = CGRectMake(100, 100, 150, 60); [button setTitle:@"push到下一个页面" forState:0]; [button setBackgroundColor:[UIColor greenColor]]; [button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button]; //添加Label self.messageLabel = [[UILabel alloc] initWithFrame:CGRectMake(100, 200, 150, 60)]; self.messageLabel.backgroundColor = [UIColor greenColor]; self.messageLabel.textAlignment = NSTextAlignmentCenter; [self.view addSubview:self.messageLabel]; [self addNotification];}/** * 添加通知 */- (void)addNotification{ /** * @param receiveNotification: 接收通知后执行的方法 * * @name: 通知的名字 */ [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveNotification:) name:@"notification" object:nil];}/** * 接收到通知 */- (void)receiveNotification:(NSNotification*)info{ NSDictionary *dict = info.userInfo; NSString *message = dict[@"info"]; if (message) { NSLog(@"%@",message); self.messageLabel.text = message; }}/** * 按钮事件 */- (void)buttonAction:(UIButton*)sender{ LFViewController *lfController = [[LFViewController alloc] init]; [self.navigationController pushViewController:lfController animated:YES];}-(void)dealloc{ //移除通知 [[NSNotificationCenter defaultCenter] removeObserver:self name:@"notification" object:nil];}@end #import @interface LFViewController : UIViewController@end
#import "LFViewController.h"@interface LFViewController ()@end@implementation LFViewController- (void)viewDidLoad { [super viewDidLoad]; //添加按钮 UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeCustom]; backBtn.frame = CGRectMake(100, 100, 150, 60); [backBtn setTitle:@"返回且发送通知" forState:0]; [backBtn setBackgroundColor:[UIColor greenColor]]; [backBtn addTarget:self action:@selector(backBtnAction:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:backBtn];}/** * backBtn按钮的事件 */- (void)backBtnAction:(UIButton*)sender{ NSDictionary *dict = @{ @"info":@"a good news"}; /** * @Name 通知的名字 * @userInfo 通知携带的信息 */ NSNotification *notification = [[NSNotification alloc] initWithName:@"notification" object:nil userInfo:dict]; //发送通知 [[NSNotificationCenter defaultCenter] postNotification:notification]; [self.navigationController popViewControllerAnimated:YES];}@end