最近在研究怎麼收送push notification，以及怎麼架設notification server。
推播服務的介紹及運作方式可以參考：
簡單來說就是每個iOS的app第一次開啓時會向apple註冊推播服務，然後得到專屬的device token，可以想像成擁有專屬的tunnel，再來只要向apple的server傳送message(JSON格式)，並帶上target device token，server就會自動幫你轉傳給對方。
寫一個小小的測試程式
網站說明非常清楚，大致上的流程如下：
- 登入 iOS dev center 然後創建一個新的 App ID
- 開啓 push notification service
- 下載 "Development Push SSL Certificate" 及 "Provisioning Profile"
Receiver (iOS app):
- 安裝 provisioning profile
- 設定 identifier
- Write the code to register from remote notification server and get "device token"
範例：
要求使用者開啓 Push notification 服務
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
[[UIApplication sharedApplication]registerForRemoteNotificationTypes:
(UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound)];
}
Implement 3個 delegate
- (void)application:(UIApplication *)app didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
/* Get device token */
NSString *strDevToken = [NSString stringWithFormat:@"%@", deviceToken];
/* Replace '<', '>' and ' ' */
NSCharacterSet *charDummy = [NSCharacterSet characterSetWithCharactersInString:@"<> "];
strDevToken = [[strDevToken componentsSeparatedByCharactersInSet: charDummy] componentsJoinedByString: @""];
NSLog(@"Device token=[%@]", strDevToken);
/* 可以把token傳到server，之後server就可以靠它送推播給使用者了 */
}
- (void)application:(UIApplication *)app didFailToRegisterForRemoteNotificationsWithError:(NSError *)err
{
NSLog(@"Error=[%@]", err);
// TODO: when user do not allow push notification service, pop the warning message.
}
// This function called when receive notification and app is in the foreground.
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
/* 把收到的推播列舉出來 */
for (id key in userInfo) {
NSLog(@"Key=[%@], Value=[%@]", key, [userInfo objectForKey:key]);
}
/* 印出 Badge number */
NSLog(@"Badge: %@", [[userInfo objectForKey:@"aps"] objectForKey:@"badge"];
}
Sender (MacOS app):
- Base on sample code "PushMeBaby"
- Install "Development Push SSL Certificate"
- Set target device token then send
參考資料
至於要如何架設APNS，可以參考下一篇：架設 Apple Push Notification Provider Server
