iOS 10 添加本地推送（Local Notification）

前言
iOS 10 中废弃了 UILocalNotification（ UIKit Framework） 这个类，采用了全新的 UserNotifications Framework 来推送通知，从此推送通知也有了自己的标签 UN（这待遇真是没别人了），以及对推送功能的一系列增强改进（两个 extension 和 界面的体验优化），简直是苹果的亲儿子，因此推送这部分功能也成为开发中的重点。

本文主要查看了 iOS 10 的相关文档，整理出了在 iOS 10 下的本地推送通知，由于都是代码，就不多做讲解，直接看代码及注释，有问题留言讨论哦。

新的推送注册机制
注册通知（Appdelegate.m）：

#import 
#import "AppDelegate.h"
@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   // 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)
                         completionHandler:^(BOOL granted, NSError * _Nullable error) {
                             // Enable or disable features based on authorization.
                         }];
   
   //获取当前的通知设置，UNNotificationSettings 是只读对象，不能直接修改，只能通过以下方法获取
   [center getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
       
   }];
   return YES;
}

#pragma mark - UNUserNotificationCenterDelegate
//在展示通知前进行处理，即有机会在展示通知前再修改通知内容。
-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler{
   //1. 处理通知
   
   //2. 处理完成后条用 completionHandler ，用于指示在前台显示通知的形式
   completionHandler(UNNotificationPresentationOptionAlert);
}
@end

推送本地通知

//使用 UNNotification 本地通知
+(void)registerNotification:(NSInteger )alerTime{
    
    // 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:@"Hello!" arguments:nil];
    content.body = [NSString localizedUserNotificationStringForKey:@"Hello_message_body"
                                                         arguments:nil];
    content.sound = [UNNotificationSound defaultSound];
    
    // 在 alertTime 后推送本地推送
    UNTimeIntervalNotificationTrigger* trigger = [UNTimeIntervalNotificationTrigger
                                                  triggerWithTimeInterval:alerTime 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) {
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"本地通知" message:@"成功添加推送" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
        [alert addAction:cancelAction];
        [[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:alert animated:YES completion:nil];
    }];
}

iOS 10 以前本地推送通知：

+ (void)registerLocalNotificationInOldWay:(NSInteger)alertTime {
    // ios8后，需要添加这个注册，才能得到授权
    //    if ([[UIApplication sharedApplication] respondsToSelector:@selector(registerUserNotificationSettings:)]) {
    //        UIUserNotificationType type =  UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound;
    //        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:type
    //                                                                                 categories:nil];
    //        [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
    //        // 通知重复提示的单位，可以是天、周、月
    //    }
    
    UILocalNotification *notification = [[UILocalNotification alloc] init];
    // 设置触发通知的时间
    NSDate *fireDate = [NSDate dateWithTimeIntervalSinceNow:alertTime];
    NSLog(@"fireDate=%@",fireDate);
    
    notification.fireDate = fireDate;
    // 时区
    notification.timeZone = [NSTimeZone defaultTimeZone];
    // 设置重复的间隔
    notification.repeatInterval = kCFCalendarUnitSecond;
    
    // 通知内容
    notification.alertBody =  @"该起床了...";
    notification.applicationIconBadgeNumber = 1;
    // 通知被触发时播放的声音
    notification.soundName = UILocalNotificationDefaultSoundName;
    // 通知参数
    NSDictionary *userDict = [NSDictionary dictionaryWithObject:@"开始学习iOS开发了" forKey:@"key"];
    notification.userInfo = userDict;
    
    // ios8后，需要添加这个注册，才能得到授权
    if ([[UIApplication sharedApplication] respondsToSelector:@selector(registerUserNotificationSettings:)]) {
        UIUserNotificationType type =  UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound;
        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:type
                                                                                 categories:nil];
        [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
        // 通知重复提示的单位，可以是天、周、月
        notification.repeatInterval = NSCalendarUnitDay;
    } else {
        // 通知重复提示的单位，可以是天、周、月
        notification.repeatInterval = NSDayCalendarUnit;
    }
    
    // 执行通知注册
    [[UIApplication sharedApplication] scheduleLocalNotification:notification];
}