iOS设备有Portrait (正向)，Upside down (颠倒)，Landscape Left （向左侧翻转）和 Landscape Right (向右侧翻转)四个方向.可以在AppDelegate可以根据设备来设置不同的方向：
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
return UIInterfaceOrientationMaskPortrait;
}
设备方向可以通过UIInterfaceOrientationMask枚举来设置:
typedef NS_OPTIONS(NSUInteger, UIInterfaceOrientationMask) {
UIInterfaceOrientationMaskPortrait = (1 << UIInterfaceOrientationPortrait),
UIInterfaceOrientationMaskLandscapeLeft = (1 << UIInterfaceOrientationLandscapeLeft),
UIInterfaceOrientationMaskLandscapeRight = (1 << UIInterfaceOrientationLandscapeRight),
UIInterfaceOrientationMaskPortraitUpsideDown = (1 << UIInterfaceOrientationPortraitUpsideDown),
UIInterfaceOrientationMaskLandscape = (UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),
UIInterfaceOrientationMaskAll = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight | UIInterfaceOrientationMaskPortraitUpsideDown),
UIInterfaceOrientationMaskAllButUpsideDown = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),
} __TVOS_PROHIBITED;
如果项目中有些页面要求特定的方向旋转，可以在ViewController中设置:
- (BOOL)shouldAutorotate {
return YES;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationLandscapeRight;
}
默认方向设置:
-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
return UIInterfaceOrientationPortrait;
}
旋转通知:
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationChange:) name:UIDeviceOrientationDidChangeNotification object:nil];
- (void)deviceOrientationChange:(NSNotification *)notification {
UIDeviceOrientation orient = [UIDevice currentDevice].orientation;
switch (orient) {
case UIDeviceOrientationPortrait:
break;
case UIDeviceOrientationLandscapeLeft:
break;
case UIDeviceOrientationPortraitUpsideDown:
break;
case UIDeviceOrientationLandscapeRight:
break;
default:
break;
}
}
状态栏变更通知:
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationChange:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
- (void)statusBarOrientationChange:(NSNotification *)notification{
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
if (orientation == UIInterfaceOrientationLandscapeRight) {
}
if (orientation ==UIInterfaceOrientationLandscapeLeft) {
}
if (orientation == UIInterfaceOrientationPortrait){
}
if (orientation == UIInterfaceOrientationPortraitUpsideDown){
}
}
