在 iOS 8 上編譯會出現以下 log ：

registerForRemoteNotificationTypes: is not supported in iOS 8.0 and later.

在 iOS 8 必須用 registerForRemoteNotifications 和 registerUserNotificationSettings 取代
以下程式碼同時支援 iOS 8 與 iOS 7

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
        
    [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings
                                                                             settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge)
                                                                             categories:nil]];
    [[UIApplication sharedApplication] registerForRemoteNotifications];
        
}else {
        
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];
}

如果要檢查推播有沒有打開，這部份也要修改。

UIRemoteNotificationType types;
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {

    types = [[UIApplication sharedApplication] currentUserNotificationSettings].types;

}else {

    types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
}

if (types == UIRemoteNotificationTypeNone) {
    // 推播未打開
}

在 iOS 7 以及更早之前的版本，MapView 顯示使用者位置不需實作到 CLLocationManager ，現在都要了。

在 iOS 8 上編譯會出現以下 log ：

Trying to start MapKit location updates without prompting for location authorization. Must call -[CLLocationManager requestWhenInUseAuthorization] or -[CLLocationManager requestAlwaysAuthorization] first.

首先必須要修改 info.plist
新增 key值為 NSLocationWhenInUseUsageDescription 或 NSLocationAlwaysUsageDescription
Value值為要出現在螢幕上的字，終於可以客製化訊息了！但也可以留白。
兩者差異僅在前者只有使用中才會定位，後者是在背景也會持續定位。

接著修改程式碼，第5行是重點

locationManager = [[CLLocationManager alloc] init];
        locationManager.delegate = self;
        locationManager.desiredAccuracy=kCLLocationAccuracyBest;
        if([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
            [locationManager requestWhenInUseAuthorization];
        }
        [locationManager startUpdatingLocation];

另外授權檢查部分也要修改，請注意4,5行的差異

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {

    if (
        ([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)] && status != kCLAuthorizationStatusNotDetermined && status != kCLAuthorizationStatusAuthorizedWhenInUse) ||
        (![locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)] && status != kCLAuthorizationStatusNotDetermined && status != kCLAuthorizationStatusAuthorized)
        ) {

        NSString *message = @"您的手機目前並未開啟定位服務，如欲開啟定位服務，請至設定->隱私->定位服務，開啟本程式的定位服務功能";
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"無法定位" message:message delegate:nil cancelButtonTitle:@"確定" otherButtonTitles: nil];
        [alertView show];

    }else {

        [locationManager startUpdatingLocation];
    }
}

上面那行是 iOS 8 以上，第二行是 iOS 7 以下，因為 kCLAuthorizationStatusAuthorized 在 iOS 8 完全不能使用。

別的地方要這樣寫

CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
    
    if (status == kCLAuthorizationStatusAuthorizedWhenInUse || status == kCLAuthorizationStatusAuthorized) {

    // 開始定位

}else {

    // 顯示警告
}

使用社群 SDK 時會跳到另一個 App 要求授權再回來，這時需要判斷回來後要做什麼事。

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
    
    if ([url.scheme isEqualToString:@"fbxxxxxxxxxx"]) {
        return [FBAppCall handleOpenURL:url sourceApplication:sourceApplication];
        
    }else if ([url.scheme isEqualToString:@"wbxxxxxxxxxx"]) {
        return [WeiboSDK handleOpenURL:url delegate:self];
        
    }else if ([url.scheme isEqualToString:@"wxxxxxxxxxxx"]) {
        return [WXApi handleOpenURL:url delegate:self];
        
    }else if ([url.host isEqualToString:@"home"]) {
        // do something
        return YES;
    }

    return NO;
}

以上同時有 Facebook 微博 微信 以及回到此 App 的第一個畫面。