iOS推送

一、推送分为两种

一种是本地消息(Local Notificatio)，一种是远程消息(Push Notification).  

二、推送的效果

UIRemoteNotificationTypeBadge 在应用图标上面显示角标
UIRemoteNotificationTypeSound 声音提醒
UIRemoteNotificationTypeAlert 通过alert或者是banner展示内容

三、本地推送

代码示例：

1、注册推送

//iOS8以后，使用推送需要用户授权
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
    UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes: (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound) categories:nil];
    [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
    [[UIApplication sharedApplication] registerForRemoteNotifications];
} else  {
    [[UIApplication sharedApplication]registerForRemoteNotificationTypes:UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound];
}

2、重写代理方法，查看“注册推送”的状态

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    NSString* token = [NSString stringWithFormat:@"%@", deviceToken];
    NSLog(@"Register ok! %@", token);
 }
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
    NSLog(@"Register failed! %@", error);
}

3、添加通知

- (void)viewDidLoad {
    [super viewDidLoad];

    UILocalNotification *localNoti = [[UILocalNotification alloc] init];
    localNoti.alertBody = @"这是一个推送的示例！！！";
    localNoti.fireDate = [NSDate dateWithTimeIntervalSinceNow:5]; //设置5秒后发起通知
    localNoti.soundName = @"default";
    localNoti.applicationIconBadgeNumber = 1; //设置角标的数值
    [[UIApplication sharedApplication] scheduleLocalNotification:localNoti];
}

至此，一个简单的本地推送示例就完成了。

四、远程推送

1、原理

1：app服务器把要发送的消息、目的设备的唯一标识打包，发给APNs。
2：APNs根据设备的唯一标识，把消息发送到设备。
3：app按照推送类型展示：是否需要声音，是否有角标，以及banner。
⚠️ 远程推送需要有推送证书。

2、实现

(1)、注册推送

//iOS8以后，使用推送需要用户授权
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
    UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes: (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound) categories:nil];
    [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
    [[UIApplication sharedApplication] registerForRemoteNotifications];
} else  {
    [[UIApplication sharedApplication]registerForRemoteNotificationTypes:UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound];
}

(2)、重写代理方法，查看“注册推送”的状态，并上传deviceToken至app服务器

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
    NSString* token = [NSString stringWithFormat:@"%@", deviceToken];
    NSLog(@"Register ok! %@", token);
    //上传deviceToken到app的服务器
    [KKUtils setTokenID:deviceToken];
 }
- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error {
    NSLog(@"Register failed! %@", error);
}

3、添加通知

这个具体在app的服务器中实现。