iOS logo消息个数

iOS8之前：

[[UIApplication sharedApplication] setApplicationIconBadgeNumber:100];

iOS8之后：

UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];

[[UIApplication sharedApplication] registerUserNotificationSettings:settings];

[[UIApplication sharedApplication] setApplicationIconBadgeNumber:100];