问题描述：在iOS8中调用-[UIApplication setApplicationIconBadgeNumber:]会出现如下没有权限的提示：
Attempting to badge the application icon but haven't received permission from the user to badge the application
问题分析：
用如下方法注册通知权限后，App会弹出一个框进行确认。在确认之前或者被否决，都是没有权限设置红点的。
UIUserNotificationSettings* notificationSettings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound categories:nil];
[[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings];
iOS8中新增了通知授权后的回调：
- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings
问题解决：
把所有
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions中的-[UIApplication setApplicationIconBadgeNumber:]
移到
- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings
回调中