UIDeviceOrientation 和 UIInterfaceOrientation 设备旋转的方向

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
//宣告一個UIDevice指標，並取得目前Device的狀況
UIDevice *device = [UIDevice currentDevice] ;
//取得當前Device的方向，來當作判斷敘述。（Device的方向型態為Integer）
switch (device.orientation) {
case UIDeviceOrientationFaceUp:
NSLog(@"螢幕朝上平躺");
break;
case UIDeviceOrientationFaceDown:
NSLog(@"螢幕朝下平躺");
break;
//系統無法判斷目前Device的方向，有可能是斜置
case UIDeviceOrientationUnknown:
NSLog(@"未知方向");
break;
case UIDeviceOrientationLandscapeLeft:
NSLog(@"螢幕向左橫置");
break;
case UIDeviceOrientationLandscapeRight:
NSLog(@"螢幕向右橫置");
break;
case UIDeviceOrientationPortrait:
NSLog(@"螢幕直立");
break;
case UIDeviceOrientationPortraitUpsideDown:
NSLog(@"螢幕直立，上下顛倒");
break;
default:
NSLog(@"無法辨識");
break;
}
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft); // 只支持向左横向, YES 表示支持所有方向
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
if (UIDeviceOrientationIsLandscape(deviceOrientation)) NSLog(@"横向");
else if(UIDeviceOrientationIsPortrait(deviceOrientation)) NSLog(@"纵向");

// // Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft); // 只支持向左横向, YES 表示支持所有方向
}

typedef enum {
UIDeviceOrientationUnknown,
UIDeviceOrientationPortrait,  // Device oriented vertically, home button on the bottom
UIDeviceOrientationPortraitUpsideDown,  // Device oriented vertically, home button on the top
UIDeviceOrientationLandscapeLeft,  // Device oriented horizontally, home button on the right
UIDeviceOrientationLandscapeRight, // Device oriented horizontally, home button on the left
UIDeviceOrientationFaceUp, // Device oriented flat, face up
UIDeviceOrientationFaceDown// Device oriented flat, face down
} UIDeviceOrientation;

typedef enum {
UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,
UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,
UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,
UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft
} UIInterfaceOrientation;

#define UIDeviceOrientationIsPortrait(orientation)  ((orientation) ==UIDeviceOrientationPortrait || (orientation) ==UIDeviceOrientationPortraitUpsideDown)

#define UIDeviceOrientationIsLandscape(orientation) ((orientation) ==UIDeviceOrientationLandscapeLeft || (orientation) ==UIDeviceOrientationLandscapeRight)