[英]Orientation change
is there any difference when we use following two methods for orientation change in iOS. 当我们在iOS中使用以下两种方法进行方向更改时,有什么区别。
1) Using NotificationCenter 1)使用NotificationCenter
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChange) name:UIDeviceOrientationDidChangeNotification object:nil];
-(void) orientationChange
{
UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
NSLog(@"Orientation =%d",orientation);
NSLog(@"in Testtt");
}
2) ViewController Orientation delegate methods 2)ViewController方向委托方法
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
if(UIInterfaceOrientationLandscapeRight == interfaceOrientation || UIInterfaceOrientationLandscapeLeft == interfaceOrientation)
return YES;
else
return NO;
}
In first case you will receive UIDeviceOrientation. 在第一种情况下,您将收到UIDeviceOrientation。
[[UIDevice currentDevice] orientation]
returns UIDeviceOrientation , device orientation. [[UIDevice currentDevice] orientation]
返回UIDeviceOrientation ,设备方向。 But note that UIDeviceOrientation is not always UIInterfaceOrientation. 但是请注意,UIDeviceOrientation并不总是UIInterfaceOrientation。 For example, when your device is on a plain table you can receive unexpected value (
UIDeviceOrientationUnknown
). 例如,当您的设备位于普通表上时,您会收到意外的值(
UIDeviceOrientationUnknown
)。
In shouldAutorotateToInterfaceOrientation
method you can access UIInterfaceOrientation, current orientation of the interface. 在
shouldAutorotateToInterfaceOrientation
方法中,您可以访问UIInterfaceOrientation(接口的当前方向)。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.