参考：

iOS之远程推送
苹果开发者文档Local and Remote Notification Programming Guide
iOS开发 适配Xcode8以及iOS10-推送

iOS推送实验室-做之前看看我少走弯路

说明

适用于iOS10.0之前。

注册远程通知（获取deviceToken）

注册远程通知的方法
一般都是在APP启动的时候去注册远程通知，注册方法调用一般都在didFinishLaunchingWithOptions（AppDelegate.m文件中）方法中

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

- (void)registerForRemoteNotification {
    //在iOS8或之后
    if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) {
        UIUserNotificationType types = UIUserNotificationTypeSound | UIUserNotificationTypeBadge | UIUserNotificationTypeAlert;
        UIUserNotificationSettings *notificationSettings = [UIUserNotificationSettings settingsForTypes:types categories:nil];
        [[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings];
    } else {
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
    }
}

处理注册远程通知的回调方法

// 注册成功回调方法，其中deviceToken即为APNs返回的token
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    [self sendProviderDeviceToken:deviceToken]; // 将此deviceToken发送给Provider
}
// 注册失败回调方法，处理失败情况
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {

}