iOS 本地推送（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:

• 第一个代理方法：

-(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();
}