iOS远程推送

远程推送流程概述

iOS远程推送是通过deviceToken进行的，拿到deviceToken需要注册远程通知，注册成功系统提供回调方application:didRegisterForRemoteNotificationsWithDeviceToken:返回deviceToken，拿到deviceToken后直接发送给推送服务器(可以是三方推送服务器或者公司服务端搭建的推送服务器)，此时对于客户端而言，只需要在接收远程通知的代理方法中application:didReceiveRemoteNotification:处理接收到的通知即可

远程推送注册说明

iOS8以前的远程通知设置就是注册(registerForRemoteNotificationTypes:)，iOS8以后远程通知设置仅仅是用户授权请求(registerUserNotificationSettings:)，经用户授权成功才可以进行远程通知注册，授权成功系统会提供回调只需要在回调代理方法application:didRegisterUserNotificationSettings:中进行远程通知注册[application registerForRemoteNotifications]即可

远程推送代码实现

1、远程通知授权

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    //如果使用第三方，通常需要在这里启动三方的sdk
    // 注册APNS远程通知设置
    // iOS8以上注册远程通知授权，授权成功才会去注册远程通知
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0 ||
        [UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)]) {
        
        // 定义用户通知类型(Remote.远程 - Badge.标记 Alert.提示 Sound.声音)
        UIUserNotificationType types = UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound;
        
        // 定义用户通知设置
        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:types categories:nil];
        
        // 注册用户通知 - 根据用户通知设置
        [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
    } else { // iOS8.0 以前不需要授权，直接注册远程通知
        // 定义远程通知类型(Remote.远程 - Badge.标记 Alert.提示 Sound.声音)
        UIRemoteNotificationType myTypes = UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound;
        
        // 注册远程通知 -根据远程通知类型
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes:myTypes];
    }
    return YES;
}

//iOS10和xcode8的改动
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
    //如果使用第三方，通常需要在这里启动三方的sdk
    // 注册APNS远程通知设置
    /*
     警告：Xcode8 需要手动开启"TARGETS -> Capabilities -> Push Notifications"
     */
    /*
     警告：该方法需要开发者自定义，以下代码根据 APP 支持的 iOS 系统不同，代码可以对应修改。
     以下为演示代码，注意根据实际需要修改，注意测试支持的 iOS 系统都能获取到 DeviceToken
     */
    if ([[UIDevice currentDevice].systemVersion floatValue] >= 10.0) {
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0 // Xcode 8编译会调用
        UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
        center.delegate = self;
        [center requestAuthorizationWithOptions:(UNAuthorizationOptionBadge | UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionCarPlay) completionHandler:^(BOOL granted, NSError *_Nullable error) {
            if (!error && granted) {
                NSLog(@"request authorization succeeded!");
            } else {
                NSLog(@"request authorization 注册失败");
            }
        }];
        
        [[UIApplication sharedApplication] registerForRemoteNotifications];
#else // Xcode 7编译会调用
        UIUserNotificationType types = (UIUserNotificationTypeAlert | UIUserNotificationTypeSound | UIUserNotificationTypeBadge);
        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:types categories:nil];
        [[UIApplication sharedApplication] registerForRemoteNotifications];
        [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
#endif
    } else if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
        UIUserNotificationType types = (UIUserNotificationTypeAlert | UIUserNotificationTypeSound | UIUserNotificationTypeBadge);
        UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:types categories:nil];
        [[UIApplication sharedApplication] registerForRemoteNotifications];
        [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
    } else {
        UIRemoteNotificationType apn_type = (UIRemoteNotificationType)(UIRemoteNotificationTypeAlert |
                                                                       UIRemoteNotificationTypeSound |
                                                                       UIRemoteNotificationTypeBadge);
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes:apn_type];
    }
}

2、授权成功注册远程通知

//这个也是iOS8以后的方法，需要配合上面的注册方法registerUserNotificationSettings
- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings {
    // 注册远程通知
    [application registerForRemoteNotifications];
}

3、获取deviceToken(注册远程通回调)

//注册远程通知成功回调
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    NSString *token = [[deviceToken description] stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]];
    token = [token stringByReplacingOccurrencesOfString:@" " withString:@""];
    
    // 将deviceToken的发送到服务器，如果使用三方推送，将deviceToken发送给三方服务器
}

//注册远程通知失败回调
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
    
}

4、接收远程通知

//iOS8以前接收远程通知
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {
    //处理通知
}

//iOS8以后接收远程通知
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler {
 //处理通知

//最后必须回调 completionHandler
completionHandler(UIBackgroundFetchResultNewData);
}