好久沒接入UILocalNotification了，今天接入時發現沒有權限啟動通知。
錯誤如下：

Attempting to schedule a local notification {fire date = (null), time zone = (null), repeat interval =
0, repeat count = UILocalNotificationInfiniteRepeatCount, next fire
a badge number but haven't received permission from the user to badge
the application

看了下API，原來iOS8增加了啟動授權，需要用戶同意下才能注冊通知。

添加如下代碼：

- (void)RegistNotificationSettings
{
    float sysVersion=[[UIDevice currentDevice]systemVersion].floatValue;
    if (sysVersion>=8.0) {
        UIUserNotificationType type = UIUserNotificationTypeBadge | UIUserNotificationTypeAlert | UIUserNotificationTypeSound;
        UIUserNotificationSettings *setting = [UIUserNotificationSettings settingsForTypes:type categories:nil];
        [[UIApplication sharedApplication] registerUserNotificationSettings:setting];
    }
}

你可以在注冊通知之前調用，也可以在app啟動時候調用

- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
    // todo ...

    [self RegistNotificationSettings];
    return YES;
}

注意：只要用戶對app授權過了，以後即使刪除再次安裝，也默認為授權了。