iOS 本地通知

以前一直迷惑，本地推送到底有什么用，后来仔细想了想，确实有用（废话，不然苹果爸爸干嘛开发这个？手动鄙视自己！）

本地通知服务 主要处理基于时间行为的通知。比如定时通知用户该起床撒尿了。

就是这么个用处！嗯，是这样吧？是的！

在iOS10苹果废弃了之前的UILocalNotification，而采用了新的UserNotifications Framework来推送通知。现在先说一下iOS10之前的本地推送流程！

iOS 10之前

注册通知

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    // Override point for customization after application launch.    if ([[UIDevice currentDevice].systemVersion floatValue] > 8.0) {        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound categories:nil];        [application registerUserNotificationSettings:settings];    }    return YES;}

发送通知

// 1.创建一个本地通知    UILocalNotification *localNote = [[UILocalNotification alloc] init];    // 1.1.设置通知发出的时间    localNote.fireDate = [NSDate dateWithTimeIntervalSinceNow:5];    // 1.2.设置通知内容    localNote.alertBody = @"这是一个本地推送";    // 1.3.设置锁屏时,字体下方显示的一个文字    localNote.alertAction = @"看我";    localNote.hasAction = YES;    // 1.4.设置启动图片(通过通知打开的)    localNote.alertLaunchImage = @"../Documents/1.jpg";    // 1.5.设置通过到来的声音    localNote.soundName = UILocalNotificationDefaultSoundName;    // 1.6.设置应用图标左上角显示的数字    localNote.applicationIconBadgeNumber = 1;    // 1.7.设置一些额外的信息    localNote.userInfo = @{@"hello" : @"how are you", @"msg" : @"success"};    // 2.执行通知    [[UIApplication sharedApplication] scheduleLocalNotification:localNote];

这里要说一点，就是iOS系统限制了注册本地推送的数量，最大的注册量为64条。

接收推送

• 应用在前台或后台，未被杀死时。

//程序处于前台或后台时调用- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification{    NSLog(@"333这里被调用");    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Title" message:@"程序在前台或后台，未被杀死，点击通知栏调用" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil];    [alert show];}

• 程序已被杀死时

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    // Override point for customization after application launch.    if (launchOptions[UIApplicationLaunchOptionsLocalNotificationKey]) {        //添加处理代码        NSLog(@"666这里被调用");        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Title" message:@"程序已被杀死，点击通知栏调用" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil];        [alert show];    }    return YES;}

iOS 10之后

先导入这个东西#import <UserNotifications/UserNotifications.h>

注册通知

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    // Override point for customization after application launch.    // 使用 UNUserNotificationCenter 来管理通知    UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];    //监听回调事件    center.delegate = self;    //iOS 10 使用以下方法注册，才能得到授权    [center requestAuthorizationWithOptions:(UNAuthorizationOptionAlert + UNAuthorizationOptionSound + UNAuthorizationOptionBadge)                          completionHandler:^(BOOL granted, NSError * _Nullable error) {                              // Enable or disable features based on authorization.                          }];    return YES;}

发送通知

// 使用 UNUserNotificationCenter 来管理通知    UNUserNotificationCenter* center = [UNUserNotificationCenter currentNotificationCenter];    //需创建一个包含待通知内容的 UNMutableNotificationContent 对象，注意不是 UNNotificationContent ,此对象为不可变对象。    UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init];    content.title = [NSString localizedUserNotificationStringForKey:@"本地推送Title" arguments:nil];    content.body = [NSString localizedUserNotificationStringForKey:@"本地推送Body"     arguments:nil];    content.sound = [UNNotificationSound defaultSound];    // 在 设定时间 后推送本地推送    UNTimeIntervalNotificationTrigger* trigger = [UNTimeIntervalNotificationTrigger                                                  triggerWithTimeInterval:5 repeats:NO];    UNNotificationRequest* request = [UNNotificationRequest requestWithIdentifier:@"FiveSecond"                                                                          content:content trigger:trigger];    //添加推送成功后的处理！    [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {    }];

通知处理

实现UNUserNotificationCenterDelegate代理方法:

• 第一个方法：

-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler{    // 处理完成后条用 completionHandler ，用于指示在前台显示通知的形式    completionHandler(UNNotificationPresentationOptionSound);}

这个方法中的那句话就是，当应用在前台的时候，收到本地通知，是用什么方式来展现。系统给了三种形式：

typedef NS_OPTIONS(NSUInteger, UNNotificationPresentationOptions) {    UNNotificationPresentationOptionBadge   = (1 << 0),    UNNotificationPresentationOptionSound   = (1 << 1),    UNNotificationPresentationOptionAlert   = (1 << 2),} 

• 第二个代理方法：

这个方法是在后台或者程序被杀死的时候，点击通知栏调用的，在前台的时候不会被调用

- (void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void(^)())completionHandler{    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Title" message:@"message" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil];    [alert show];    completionHandler();}