iOS——本地推送

iOS——本地推送

首先我们要知道本地推送是什么，iOS开发中经常用到本地通知，有时也叫做本地推送，两者都是同一个类UILocalNotification，这个类可以用于开发者灵活控制一些需要推送到通知栏的信息，比如提示信息，日程提醒或者是一些其他应用信息，它和远程通知（也叫远程推送，RemoteNotification）本质没有多大区别，唯一区别在于发起的地方不同，本地通知在APP内发起，而远程通知由远端服务器发起通过APNS推送到设备，两者展示的方式都一样，都会出现在通知栏，都可以携带信息。下面用通过三个步骤来讲下本地通知的使用方法。

看看这张图：

是不是觉得很眼熟，这是在我们手机退出了QQ返回到桌面或者其他应用的时候，当QQ又来了消息时，在最顶部出现的一条关于QQ消息的推送个，这就是一个本地推送。其实基本上大多数app在不使用的时候也会有本地推送，推送一些可能让用户感兴趣的内容，用户感兴趣了或者有需求了就会点进去。

本地通知的使用

在iOS8及以后发送本地通知前需要先注册一个本地通知：

#import "AppDelegate.h"
#import <UserNotifications/UserNotifications.h>
@interface AppDelegate ()
 
@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [self registerAPN];
    return YES;
}
- (void)registerAPN {

    if (@available(iOS 10.0, *)) {
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        [center requestAuthorizationWithOptions:(UNAuthorizationOptionAlert   UNAuthorizationOptionSound) completionHandler:^(BOOL granted, NSError * _Nullable error) {
            
        }];
    } else {
        UIUserNotificationSettings *setting = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert categories:nil];
        [[UIApplication sharedApplication] registerUserNotificationSettings:setting];
    }
}

#import "ViewController.h"
#import <UserNotifications/UserNotifications.h>


@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor lightGrayColor];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self removeAllNotification];
}

- (IBAction)addLocalNoticeAction:(UIButton *)sender {
    [self checkUserNotificationEnable];
    [self addLocalNotice];
}
- (IBAction)gotoSettingAction:(UIButton *)sender {
    [self goToAppSystemSetting];
}

- (void)addLocalNotice {
    if (@available(iOS 10.0, *)) {
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
        // 标题
        content.title = @"注意休息";
        content.subtitle = @"已经深夜了，好好休息";
        // 内容
        content.body = @"明天又是元气满满的一天";
        // 声音
//        content.sound = [UNNotificationSound defaultSound];
        content.sound = [UNNotificationSound soundNamed:@"Alert_ActivityGoalAttained_Salient_Haptic.caf"];
        // 角标 （我这里测试的角标无效，暂时没找到原因）
        content.badge = @1;
        // 多少秒后发送,可以将固定的日期转化为时间
        NSTimeInterval time = [[NSDate dateWithTimeIntervalSinceNow:3] timeIntervalSinceNow];
//        NSTimeInterval time = 10;
        // repeats，是否重复，如果重复的话时间必须大于60s，要不会报错
        UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:time repeats:NO];
        
        /*
        //如果想重复可以使用这个,按日期
        // 周一早上 8：00 上班
        NSDateComponents *components = [[NSDateComponents alloc] init];
        // 注意，weekday默认是从周日开始
        components.weekday = 2;
        components.hour = 8;
        UNCalendarNotificationTrigger *calendarTrigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:components repeats:YES];
        */
        // 添加通知的标识符，可以用于移除，更新等操作
        NSString *identifier = @"noticeId";
        UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:identifier content:content trigger:trigger];
        
        [center addNotificationRequest:request withCompletionHandler:^(NSError *_Nullable error) {
            NSLog(@"成功添加推送");
        }];
    }else {
        UILocalNotification *notif = [[UILocalNotification alloc] init];
        // 发出推送的日期
        notif.fireDate = [NSDate dateWithTimeIntervalSinceNow:10];
        // 推送的内容
        notif.alertBody = @"你已经10秒没出现了";
        // 可以添加特定信息
        notif.userInfo = @{@"noticeId":@"00001"};
        // 角标
        notif.applicationIconBadgeNumber = 1;
        // 提示音
        notif.soundName = UILocalNotificationDefaultSoundName;
        // 每周循环提醒
        notif.repeatInterval = NSCalendarUnitWeekOfYear;
        
        [[UIApplication sharedApplication] scheduleLocalNotification:notif];
    }
}

// 移除某一个指定的通知
- (void)removeOneNotificationWithID:(NSString *)noticeId {
    if (@available(iOS 10.0, *)) {
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        [center getPendingNotificationRequestsWithCompletionHandler:^(NSArray<UNNotificationRequest *> * _Nonnull requests) {
            for (UNNotificationRequest *req in requests){
                NSLog(@"存在的ID:%@\n",req.identifier);
            }
            NSLog(@"移除currentID:%@",noticeId);
        }];
        
        [center removePendingNotificationRequestsWithIdentifiers:@[noticeId]];
    }else {
        NSArray *array=[[UIApplication sharedApplication] scheduledLocalNotifications];
        for (UILocalNotification *localNotification in array){
            NSDictionary *userInfo = localNotification.userInfo;
            NSString *obj = [userInfo objectForKey:@"noticeId"];
            if ([obj isEqualToString:noticeId]) {
                [[UIApplication sharedApplication] cancelLocalNotification:localNotification];
            }
        }
    }
}

// 移除所有通知
- (void)removeAllNotification {
    if (@available(iOS 10.0, *)) {
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        [center removeAllPendingNotificationRequests];
    }else {
        [[UIApplication sharedApplication] cancelAllLocalNotifications];
    }
}

- (void)checkUserNotificationEnable { // 判断用户是否允许接收通知
    if (@available(iOS 10.0, *)) {
        __block BOOL isOn = NO;
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        [center getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
            if (settings.notificationCenterSetting == UNNotificationSettingEnabled) {
                isOn = YES;
                NSLog(@"打开了通知");
            }else {
                isOn = NO;
                NSLog(@"关闭了通知");
               [self showAlertView];
            }
        }];
    }else {
        if ([[UIApplication sharedApplication] currentUserNotificationSettings].types == UIUserNotificationTypeNone){
            NSLog(@"关闭了通知");
            [self showAlertView];
        }else {
            NSLog(@"打开了通知");
        }
    }
}

- (void)showAlertView {
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"通知" message:@"未获得通知权限，请前去设置" preferredStyle:UIAlertControllerStyleAlert];
    [alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];
    [alert addAction:[UIAlertAction actionWithTitle:@"设置" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
         [self goToAppSystemSetting];
    }]];
    [self presentViewController:alert animated:YES completion:nil];
}

// 如果用户关闭了接收通知功能，该方法可以跳转到APP设置页面进行修改
- (void)goToAppSystemSetting {
    dispatch_async(dispatch_get_main_queue(), ^{
        UIApplication *application = [UIApplication sharedApplication];
        NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        if ([application canOpenURL:url]) {
            if (@available(iOS 10.0, *)) {
                if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {
                    [application openURL:url options:@{} completionHandler:nil];
                }
            }else {
                [application openURL:url];
            }
        }
    });
}

然后我们点击添加本地推送，就可以达到预期的效果了：

而且我们在锁屏的时候也会接到本地通知：

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