iOS7、iOS8推送通知的区别

iOS8版本以后的推送通知代码
[[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];
//注意下面这句，在iOS8 中注册推送通知必须要加上[[UIApplication sharedApplication] registerForRemoteNotifications];
iOS8版本以前的推送通知代码
[[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert)];
如果要同时兼容iOS7 与 iOS8 我个人的写法代码如下：
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)   
 {       
 [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];        
[[UIApplication sharedApplication] registerForRemoteNotifications];    
}   
else    
{       
 [[UIApplication sharedApplication] registerForRemoteNotificationTypes:         (UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert)];    
}
ios8 横屏状态栏不显示

解决方法：在plist文件中将 View controller-based status bar appearance 设置为NO  在application:didFinishLaunchingWithOptions:中添加下面代码[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone]; 
iOS8 横屏的时候系统默认隐藏了  。。这个是ios8新特性 

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