IOS8 兼容本地推送

1if ([UIApplication instancesRespondToSelector:@selector(registerUserNotificationSettings:)])
2        
3    {
4        
5        [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil]];
6        
7    }

IOS8中需要先注册本地通知，用户点击了同意之后才能接受本地通知。