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iOS 推送开发指南

本文介绍了如何在 iOS 设备中使用 LeanCloud 的推送功能。建议先阅读《推送通知服务总览》了解相关概念。

配置 APNs 推送证书

配置 APNs 证书是使用推送服务的前提，详情请参考《iOS 推送设置指南》。

iOS 流程简介

首先，注册 APNs 申请 Token，并将其保存到云端：

注册 APNs 申请 Token

然后，调用推送通知服务提供的接口发送推送消息：

调用推送通知服务接口发推送

Installation

Installation 是 LCObject 的子类，使用 Installation 对象来保存推送所需的 token 以及其它数据。

SDK 提供默认的 Installation 对象，并会在默认对象保存成功后持久缓存其数据。一般情况下，使用默认对象保存 device token。默认对象的获取方式如下：

let installation = LCApplication.default.currentInstallation

LCInstallation *installation = [LCInstallation defaultInstallation];

除了默认的 Installation 对象，你也可以构造新的 Installation 对象，用来存储其它特殊类型的 token（诸如 VoIP 等），构造方式如下：

let installation = LCInstallation()

LCInstallation *installation = [[LCInstallation alloc] init];

SDK 即时通讯模块会使用默认 Installation 对象的 device token。如需使用即时通讯的离线推送功能，请确保默认 Installation 对象成功保存了 device token。

Installation 对象的默认字段如下所示：

字段 类型 说明
deviceToken String 推送所需的 Token
apnsTeamId String 推送所需的 Team ID
badge Number 对应应用通知的标记，主要用于通知标记清零
channels Array 订阅频道数组
deviceProfile String 自定义证书名称，主要用于多证书推送
deviceType String 设备类型，SDK 会自动设置该属性，一般情况下不要随意更改
apnsTopic String 应用的 Bundle Identifier，SDK 会自动设置该属性，一般情况下不要随意更改
timeZone String 设备所处时区，SDK 会自动设置该属性，一般情况下不要随意更改

可以在 云服务控制台 > 数据存储 > 结构化数据 > _Installation 查看所有保存成功的 Installation 对象的数据。

注册 APNs 获取 Token

在保存 installation 前，要先注册 APNs 来获取推送所需的 token，以 User Notification 为例，具体步骤如下：

import LeanCloud
import UserNotifications

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    // 首先需要初始化应用
    do {
        try LCApplication.default.set(
            id: {{appid}},
            key: {{appkey}},
            // 请将 xxx.example.com 替换为你的应用绑定的自定义 API 域名
            serverURL: "https://xxx.example.com")
    } catch {
        print(error)
        return false
    }

    UNUserNotificationCenter.current().getNotificationSettings { (settings) in
        switch settings.authorizationStatus {
        case .authorized:
            DispatchQueue.main.async {
                UIApplication.shared.registerForRemoteNotifications()
            }
        case .notDetermined:
            UNUserNotificationCenter.current().requestAuthorization(options: [.badge, .alert, .sound]) { (granted, error) in
                if granted {
                    DispatchQueue.main.async {
                        UIApplication.shared.registerForRemoteNotifications()
                    }
                }
            }
        default:
            break
        }
    }

    return true
}

#import <LeanCloudObjc/Foundation.h>
#import <UserNotifications/UserNotifications.h>

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // 首先需要初始化应用
    [LCApplication setApplicationId:{{appid}}
                          clientKey:{{appkey}}
                    serverURLString:"https://please-replace-with-your-customized.domain.com"];

    [[UNUserNotificationCenter currentNotificationCenter] getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
        switch ([settings authorizationStatus]) {
            case UNAuthorizationStatusAuthorized:
                dispatch_async(dispatch_get_main_queue(), ^{
                    [[UIApplication sharedApplication] registerForRemoteNotifications];
                });
                break;
            case UNAuthorizationStatusNotDetermined:
                [[UNUserNotificationCenter currentNotificationCenter] requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert) completionHandler:^(BOOL granted, NSError * _Nullable error) {
                    if (granted) {
                        dispatch_async(dispatch_get_main_queue(), ^{
                            [[UIApplication sharedApplication] registerForRemoteNotifications];
                        });
                    }
                }];
                break;
            default:
                break;
        }
    }];

    return YES;
}

保存 Token

注册 APNs 成功后，系统会通过 didRegisterForRemoteNotificationsWithDeviceToken 函数返回 deviceToken。一般情况，在该函数里保存 deviceToken 和 apnsTeamId 即可。保存方式如下：

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

    LCApplication.default.currentInstallation.set(
        deviceToken: deviceToken,
        apnsTeamId: "YOUR_APNS_TEAM_ID")
    LCApplication.default.currentInstallation.save { (result) in
        switch result {
        case .success:
            break
        case .failure(error: let error):
            print(error)
        }
    }
}

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {

    [[LCInstallation defaultInstallation] setDeviceTokenFromData:deviceToken
                                                          teamId:@"YOUR_APNS_TEAM_ID"];
    [[LCInstallation defaultInstallation] saveInBackgroundWithBlock:^(BOOL succeeded, NSError * _Nullable error) {
        if (succeeded) {
            // save succeeded
        } else if (error) {
            NSLog(@"%@", error);
        }
    }];
}

iOS 系统重装、从备份恢复应用、在新设备上安装应用都会导致 device token 变化，因此 Apple 推荐在应用每次启动时都去请求 APNs 的 device token，获取 token 后进行设置并保存 token。 除此以外，云服务后端会统计 Installation 的更新时间（updatedAt），据此清理长期未更新的 Installation 数据。 所以我们建议开发者遵循 Apple 的推荐方式开发应用，以免有效 Installation 数据被意外清理，以及因为 device token 过期无效而推送失败。

多证书场景

对于一些应用，他们在发布和上架时分为不同的版本（司机版、乘客版），但数据和消息是互通的，这种场景下我们允许应用上传多个自定义证书并对不同的设备设置 deviceProfile，从而可以用合适的证书给不同版本的应用推送。

当你上传自定义证书时会被要求输入「证书类型」，即 deviceProfile 的名字。当 Installation 上保存了 deviceProfile 时，我们将忽略原先的开发和生产证书设置，而直接按照 deviceProfile 推送。

特殊推送类型

对于诸如 VoIP 这类的特殊推送，由于其使用的 apnsTopic 并不是应用的 Bundle Identifier，所以在保存 token 前，需要修改 apnsTopic 为其指定的值。

发送推送消息

可以通过 REST API 或云服务控制台发送 iOS 推送消息。

推送环境

iOS 应用的推送环境有测试和生产两种。 通过 Xcode 安装的 App 处于测试环境，通过 App Store、Ad-Hoc、TestFlight 发布的正式版 App 处于生产环境。

通过 REST API 和控制台推送消息时可以通过 prod 参数指定推送到处于哪个环境的 iOS 应用。 通过 SDK 使用 Push 发起推送，默认发往生产环境的 iOS 应用。 如果要推送到测试环境，需要采用如下方式设置：

do {
    let environment: LCApplication.Environment = [.pushDevelopment]
    let configuration = LCApplication.Configuration(environment: environment)
    try LCApplication.default.set(
        id: {{appid}},
        key: {{appkey}},
        // 请将 xxx.example.com 替换为你的应用绑定的自定义 API 域名
        serverURL: "https://xxx.example.com",
        configuration: configuration)
} catch {
    print(error)
}

[LCPush setProductionMode:false];

注意，SDK 只能指定推送给哪种环境的 iOS 应用，无法切换 iOS 应用本身所处的推送环境。 iOS 应用所处的推送环境完全由 App 的分发方式决定。

注意，为防止由于大量证书错误所产生的性能问题，我们对使用 开发证书 的推送做了设备数量的限制，即一次至多可以向 20,000 个设备进行推送。如果满足推送条件的设备超过了 20,000 个，系统会拒绝此次推送（云服务控制台 > 推送 > 推送记录 页面会显示相应信息）。因此，在使用开发证书推送时，请合理设置推送条件。

使用频道

使用频道（channel）可以实现「发布—订阅」的模型。设备订阅某个频道，然后发送消息的时候指定要发送的频道即可。

注意，频道名称只能包含大小写英文字母、数字、下划线（_）、连字符（-）、等号（=）、汉字（中日韩统一表意文字）。

订阅和退订

订阅 Giants 频道：

do {
    try LCApplication.default.currentInstallation.append("channels", element: "Giants", unique: true)
    _ = LCApplication.default.currentInstallation.save({ (result) in
        switch result {
        case .success:
            break
        case .failure(error: let error):
            print(error)
        }
    })
} catch {
    print(error)
}

LCInstallation *currentInstallation = [LCInstallation defaultInstallation];
[currentInstallation addUniqueObject:@"Giants" forKey:@"channels"];
[currentInstallation saveInBackground];

订阅后要记得保存，即可在 云服务控制台 > 数据存储 > 结构化数据 > _Installation 中看到该 installation 的 channels 字段多了一个「Giants」。

退订：

do {
    try LCApplication.default.currentInstallation.remove("channels", element: "Giants")
    _ = LCApplication.default.currentInstallation.save({ (result) in
        switch result {
        case .success:
            break
        case .failure(error: let error):
            print(error)
        }
    })
} catch {
    print(error)
}

LCInstallation *currentInstallation = [LCInstallation defaultInstallation];
[currentInstallation removeObject:@"Giants" forKey:@"channels"];
[currentInstallation saveInBackground];

获取所有订阅的频道：

let subscribedChannels: LCArray? = LCApplication.default.currentInstallation.channels

NSArray *subscribedChannels = [LCInstallation defaultInstallation].channels;

发送消息到频道

发送消息到刚才订阅的「Giants」频道：

let messageData: [String: Any] = [
    "alert": "Giants 太牛掰了"
]

let channels: [String] = ["Giants"]

LCPush.send(data: messageData, channels: channels) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

// Send a notification to all devices subscribed to the "Giants" channel.
LCPush *push = [[LCPush alloc] init];
[push setChannel:@"Giants"];
[push setMessage:@"Giants 太牛掰了"];
[push sendPushInBackground];

如果你想发送到多个频道，可以指定 channels 数组：

let messageData: [String: Any] = [
    "alert": "The Giants won against the Mets 2-3."
]

let channels: [String] = ["Giants", "Mets"]

LCPush.send(data: messageData, channels: channels) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

NSArray *channels = [NSArray arrayWithObjects:@"Giants", @"Mets", nil];
LCPush *push = [[LCPush alloc] init];

// Be sure to use the plural 'setChannels'.
[push setChannels:channels];
[push setMessage:@"The Giants won against the Mets 2-3."];
[push sendPushInBackground];

高级定向发送

频道对于大多数应用来说可能就足够了。但是某些情况下，你可能需要更高精度的定向推送。推送通知服务允许你通过 LCQuery API 查询 Installation 列表，并向指定条件的 query 推送消息。

因为 Installation 同时是 LCObject 的子类，因此你可以保存任何数据类型到 Installation，并将它和你的其他应用数据对象关联起来，这样一来，你可以非常灵活地向你用户群做定制化、动态的推送。

保存 Installation 数据

为 Installation 添加三个新字段：

do {
    let currentInstallation = LCApplication.default.currentInstallation

    try currentInstallation.set("scores", value: true)
    try currentInstallation.set("gameResults", value: true)
    try currentInstallation.set("injuryReports", value: true)

    _ = currentInstallation.save({ (result) in
        switch result {
        case .success:
            break
        case .failure(error: let error):
            print(error)
        }
    })
} catch {
    print(error)
}

// Store app language and version
LCInstallation *installation = [LCInstallation defaultInstallation];

[installation setObject:@(YES) forKey:@"scores"];
[installation setObject:@(YES) forKey:@"gameResults"];
[installation setObject:@(YES) forKey:@"injuryReports"];
[installation saveInBackground];

你可以给 Installation 添加 owner 属性，比如当前的登录用户：

do {
    let currentInstallation = LCApplication.default.currentInstallation

    if let currentUser = LCApplication.default.currentUser {
        try currentInstallation.set("owner", value: currentUser)
    }

    _ = currentInstallation.save({ (result) in
        switch result {
        case .success:
            break
        case .failure(error: let error):
            print(error)
        }
    })
} catch {
    print(error)
}

// Saving the device's owner
LCInstallation *installation = [LCInstallation defaultInstallation];
[installation setObject:[LCUser currentUser] forKey:@"owner"];
[installation saveInBackground];

根据查询来推送消息

一旦 Installation 保存了你的应用数据，你可以使用 Query 来查询出设备的一个子集做推送。

let query = LCQuery(className: "_Installation")
query.whereKey("injuryReports", .equalTo(true))

let messageData: [String: Any] = [
    "alert": "Willie Hayes injured by own pop fly."
]

LCPush.send(data: messageData, query: query) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

// Create our Installation query
LCQuery *pushQuery = [LCInstallation query];
[pushQuery whereKey:@"injuryReports" equalTo:@(YES)];

// Send push notification to query
LCPush *push = [[LCPush alloc] init];
[push setQuery:pushQuery]; // Set our Installation query
[push setMessage:@"Willie Hayes injured by own pop fly."];
[push sendPushInBackground];

你也可以在查询中添加 channels 的条件：

let query = LCQuery(className: "_Installation")
query.whereKey("channels", .equalTo("Giants"))
query.whereKey("scores", .equalTo(true))

let messageData: [String: Any] = [
    "alert": "Giants scored against the A's! It's now 2-2."
]

LCPush.send(data: messageData, query: query) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

// Create our Installation query
LCQuery *pushQuery = [LCInstallation query];
[pushQuery whereKey:@"channels" equalTo:@"Giants"]; // Set channel
[pushQuery whereKey:@"scores" equalTo:@(YES)];

// Send push notification to query
LCPush *push = [[LCPush alloc] init];
[push setQuery:pushQuery];
[push setMessage:@"Giants scored against the A's! It's now 2-2."];
[push sendPushInBackground];

如果你在 Installation 还保存了其他对象的关系，我们同样可以在查询条件中使用这些数据，例如，向靠近北京大学的设备推送消息：

let beijingUniversityLocation = LCGeoPoint(latitude: 39.9869, longitude: 116.3059)

let userQuery = LCQuery(className: "_User")
userQuery.whereKey("location", .locatedNear(beijingUniversityLocation, minimal: nil, maximal: nil))

let pushQuery = LCQuery(className: "_Installation")
pushQuery.whereKey("user", .matchedQuery(userQuery))

let messageData: [String: Any] = [
    "alert": "Free hotdogs at the Tarara concession stand!"
]

LCPush.send(data: messageData, query: pushQuery) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

// Find users near a given location
LCQuery *userQuery = [LCUser query];
[userQuery whereKey:@"location"
        nearGeoPoint:beijingUniversityLocation,
         withinMiles:[NSNumber numberWithInt:1]]

// Find devices associated with these users
LCQuery *pushQuery = [LCInstallation query];
[pushQuery whereKey:@"user" matchesQuery:userQuery];

// Send push notification to query
LCPush *push = [[LCPush alloc] init];
[push setQuery:pushQuery]; // Set our Installation query
[push setMessage:@"Free hotdogs at the Tarara concession stand!"];
[push sendPushInBackground];

发送选项

除了发送一个文本信息之外，你还可以播放一个声音，设置 badge 数字或者其他想自定义的数据。你还可以设置一个消息的过期时间，如果对消息的时效性特别敏感的话。

定制通知

如果你不仅想发送一条文本消息，你可以构建自定义的推送数据。这里有一些保留字段具有特殊含义：

保留字段 说明
alert 推送消息的文本内容
badge 应用图标右上角的数字。可以设置一个值或者递增当前值。
sound 应用 bundle 里的声音文件名称。
content-available 如果使用了 Newsstand，设置为 1 来开始一次后台下载。

更多可用的保留字段，请参考《推送 REST API 使用指南》的《消息内容参数》一节。

递增 badge 数字并播放声音：

let channels: [String] = ["Mets"]

let messageData: [String: Any] = [
    "alert": "The Mets scored! The game is now tied 1-1!",
    "badge": "Increment",
    "sound": "cheering.caf"
]

LCPush.send(data: messageData, channels: channels) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

NSDictionary *data = [NSDictionary dictionaryWithObjectsAndKeys:
    @"The Mets scored! The game is now tied 1-1!", @"alert",
    @"Increment", @"badge",
    @"cheering.caf", @"sound",
    nil];
LCPush *push = [[LCPush alloc] init];
[push setChannels:[NSArray arrayWithObjects:@"Mets", nil]];
[push setData:data];
[push sendPushInBackground];

当然，你还可以添加其他自定义的数据。你会在接收推送一节看到，当应用通过推送打开你的应用的时候，你就可以访问这些数据。当你要在用户打开通知的时候显示一个不同的 view controller 的时候，这特别有用。

let channels: [String] = ["Indians"]

let messageData: [String: Any] = [
    "alert": "Ricky Vaughn was injured in last night's game!",
    "name": "Vaughn",
    "newsItem": "Man bites dog"
]

LCPush.send(data: messageData, channels: channels) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

NSDictionary *data = [NSDictionary dictionaryWithObjectsAndKeys:
    @"Ricky Vaughn was injured in last night's game!", @"alert",
    @"Vaughn", @"name",
    @"Man bites dog", @"newsItem",
    nil];
LCPush *push = [[LCPush alloc] init];
[push setChannel:@"Indians"];
[push setData:data];
[push sendPushInBackground];

设置过期日期

当设备关闭或者无法连接到网络的时候，推送通知就无法被送达。如果你有一条时间敏感的推送通知，不希望在太长时间后被用户读到，那么可以设置一个过期时间来避免打扰用户。

首先是指定过期时间来告诉云服务不要再去发送通知。

let expirationDate = Date(timeIntervalSinceNow: 600)

let messageData: [String: Any] = [
    "alert": "Season tickets on sale until October 12th"
]

LCPush.send(data: messageData, expirationDate: expirationDate) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setYear:2013];
[comps setMonth:10];
[comps setDay:12];
NSCalendar *gregorian =
  [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *date = [gregorian dateFromComponents:comps];

// Send push notification with expiration date
LCPush *push = [[LCPush alloc] init];
[push expireAtDate:date];
[push setMessage:@"Season tickets on sale until October 12th"];
[push sendPushInBackground];

这个方法有个隐患，因为设备的时钟是无法保证精确的，你可能得到错误的结果。因此，我们还提供了指定时间间隔方法，通知将在指定间隔时间后失效：

let expirationInterval: TimeInterval = 60*60*24*7

let messageData: [String: Any] = [
    "alert": "Season tickets on sale until October 18th"
]

LCPush.send(data: messageData, expirationInterval: expirationInterval) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

NSTimeInterval interval = 60*60*24*7; // 1 week

LCPush *push = [[LCPush alloc] init];
[push expireAfterTimeInterval:interval];
[push setMessage:@"Season tickets on sale until October 18th"];
[push sendPushInBackground];

注意，我们建议给 iOS 设备的推送都设置过期时间，才能保证推送的当时，如果用户设置了飞行模式，在关闭飞行模式之后可以收到推送消息，可以参考 Stackoverflow - Push notification is not being delivered when iPhone comes back online。

定时推送

我们提供了设置推送时间的方法，可以在指定的时间进行推送：

let pushDate = Date(timeIntervalSinceNow: 6000)
let messageData: [String: Any] = [
    "alert": "Push this notification at a later time."
]
LCPush.send(data: messageData, pushDate: pushDate) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setYear:2013];
[comps setMonth:10];
[comps setDay:12];
NSCalendar *gregorian =
  [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *date = [gregorian dateFromComponents:comps];

LCPush *push = [[LCPush alloc] init];
[push setPushDate:date];
[push setMessage:@"Push this notification on 2013-10-12."];
[push sendPushInBackground];

定时推送同样可以设置过期时间，例如同时指定时间间隔：

LCPush.send(data: messageData, pushDate: pushDate, expirationInterval: expirationInterval) { /* 略 */ }

LCPush *push = [[LCPush alloc] init];
[push setPushDate:date];
[push expireAfterTimeInterval:interval];
// 下略

指定设备平台

跨平台的应用，可能想指定发送的平台，比如 iOS 或者 Android:

let query = LCQuery(className: "_Installation")
query.whereKey("channels", .equalTo("suitcaseOwners"))

// Notification for Android users
query.whereKey("deviceType", .equalTo("android"))
let messageData: [String: Any] = [
    "alert": "Your suitcase has been filled with tiny robots!"
]
LCPush.send(data: messageData, query: query) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

// Notification for iOS users
query.whereKey("deviceType", .equalTo("ios"))
let messageData: [String: Any] = [
    "alert": "Your suitcase has been filled with tiny apples!"
]
LCPush.send(data: messageData, query: query) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

LCQuery *query = [LCInstallation query];
[query whereKey:@"channels" equalTo:@"suitcaseOwners"];

// Notification for Android users
[query whereKey:@"deviceType" equalTo:@"android"];
LCPush *androidPush = [[LCPush alloc] init];
[androidPush setMessage:@"Your suitcase has been filled with tiny robots!"];
[androidPush setQuery:query];
[androidPush sendPushInBackground];

// Notification for iOS users
[query whereKey:@"deviceType" equalTo:@"ios"];
LCPush *iOSPush = [[LCPush alloc] init];
[iOSPush setMessage:@"Your suitcase has been filled with tiny apples!"];
[iOSPush setChannel:@"suitcaseOwners"];
[iOSPush setQuery:query];
[iOSPush sendPushInBackground];

接收推送通知

正如 定制通知 一节提到，你可以随通知发送任意的数据。我们使用这些数据修改应用的行为，当应用是通过通知打开的时候。例如，当打开一条通知告诉你有一个新朋友的时候，这时候如果显示一张图片会非常好。

由于 Apple 的对消息大小的限制，请尽量缩小要发送的数据大小，否则会被截断。详情请参看 APNs 文档。

let messageData: [String: Any] = [
    "alert": "James commented on your photo!",
    "p": "vmRZXZ1Dvo" // Photo's object id
]

LCPush.send(data: messageData) { (result) in
    switch result {
    case .success:
        break
    case .failure(error: let error):
        print(error)
    }
}

NSDictionary *data = @{
  @"alert": @"James commented on your photo!",
  @"p": @"vmRZXZ1Dvo" // Photo's object id
};
LCPush *push = [[LCPush alloc] init];
[push setData:data];
[push sendPushInBackground];

响应通知数据

当应用是被通知打开的时候，你可以通过 application:didFinishLaunchingWithOptions:方法的 launchOptions 参数所使用的 dictionary 访问到数据：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    if let notification = launchOptions?[.remoteNotification] as? [AnyHashable: Any] {
        print(notification)
    }

    return true
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // ...
    if ([[UIDevice currentDevice].systemVersion floatValue] < 10.0) {
        NSDictionary *notificationPayload;
        @try {
            notificationPayload = launchOptions[UIApplicationLaunchOptionsRemoteNotificationKey];
        } @catch (NSException *exception) {}

        // Create a pointer to the Photo object
        NSString *photoId = [notificationPayload objectForKey:@"p"];
        LCObject *targetPhoto = [LCObject objectWithoutDataWithClassName:@"Photo"
                                                                objectId:photoId];

        // Fetch photo object
        [targetPhoto fetchIfNeededInBackgroundWithBlock:^(LCObject *object, NSError *error) {
            // Show photo view controller
            if (!error && [LCUser currentUser]) {
                PhotoVC *viewController = [[PhotoVC alloc] initWithPhoto:object];
                [self.navController pushViewController:viewController animated:YES];
            }
        }];
    }
}

如果当通知到达的时候，你的应用已经在运行，对于 iOS10 以下，你可以通过 application:didReceiveRemoteNotification:fetchCompletionHandler: 方法的 userInfo 参数所使用 dictionary 访问到数据：

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    // handle notification
}

/*!
 * Required for iOS 7+
 */
- (void)application:(UIApplication *)application
      didReceiveRemoteNotification:(NSDictionary *)userInfo
            fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))handler {
  // Create empty photo object
  NSString *photoId = [userInfo objectForKey:@"p"];
  LCObject *targetPhoto = [LCObject objectWithoutDataWithClassName:@"Photo"
                                                          objectId:photoId];

  // Fetch photo object
  [targetPhoto fetchIfNeededInBackgroundWithBlock:^(LCObject *object, NSError *error) {
    // Show photo view controller
    if (error) {
      handler(UIBackgroundFetchResultFailed);
    } else if ([LCUser currentUser]) {
      PhotoVC *viewController = [[PhotoVC alloc] initWithPhoto:object];
      [self.navController pushViewController:viewController animated:YES];
    } else {
      handler(UIBackgroundFetchResultNoData);
    }
  }];
}

iOS10 以上需要使用下面代理方法来获得 userInfo ：

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    // handle notification
}

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    // handle notification
}

/**
 * Required for iOS10+
 * 在前台收到推送内容, 执行的方法
 */
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
       willPresentNotification:(UNNotification *)notification
         withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {
    NSDictionary *userInfo = notification.request.content.userInfo;
    if([notification.request.trigger isKindOfClass:[UNPushNotificationTrigger class]]) {
        //TODO:处理远程推送内容
        NSLog(@"%@", userInfo);
    }
    // 需要执行这个方法，选择是否提醒用户，有 Badge、Sound、Alert 三种类型可以选择设置
    completionHandler(UNNotificationPresentationOptionAlert);
}

/**
 * Required for iOS10+
 * 在后台和启动之前收到推送内容, 点击推送内容后，执行的方法
 */
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
         withCompletionHandler:(void (^)())completionHandler {
    NSDictionary * userInfo = response.notification.request.content.userInfo;
    if([response.notification.request.trigger isKindOfClass:[UNPushNotificationTrigger class]]) {
        //TODO:处理远程推送内容
        NSLog(@"%@", userInfo);
    }
    completionHandler();
}

清除 Badge

一般需要在打开应用或者退出应用时，将 badge 数目清零。

override func applicationDidBecomeActive(_ application: UIApplication) {
    //本地清空角标
    application.applicationIconBadgeNumber = 0
    //currentInstallation 的角标清零
    LCApplication.default.currentInstallation.badge = 0
    LCApplication.default.currentInstallation.save { (result) in
        switch result {
        case .success:
            break
        case .failure(error: let error):
            print(error)
        }
    }
 }

- (void)applicationDidBecomeActive:(UIApplication *)application {
    //本地清空角标
    [application setApplicationIconBadgeNumber:0];
    //currentInstallation 的角标清零
    [LCInstallation defaultInstallation].badge = 0;
    [[LCInstallation defaultInstallation] saveInBackgroundWithBlock:^(BOOL succeeded, NSError * _Nullable error) {
        if (succeeded) {
         // save succeeded
        } else if (error) {
         NSLog(@"%@", error);
        }
    }];
}

你可以阅读 Apple 本地化和推送的文档 来更多地了解推送通知。

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