一、横竖屏有控制优先级，一旦优先级高的关闭了横竖屏配置，优先级低的无论如何配置都无法做到横竖屏。
对于限于VC范围来讲优先级最高的是当前的window的rootViewController，而往往我们的项目结构是容器视图控制器控制VC，tabBarController控制navigationController之后是VC，而横竖屏控制的优先级也是跟你的项目架构一样。appDelegate>>rootViewController>>ViewController
解决方法：1.利用模态跳转到VC；
2.配置根视图：
- (BOOL)shouldAutorotate {
return [[self.viewControllers lastObject] shouldAutorotate];
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
return [[self.viewControllers lastObject] supportedInterfaceOrientations];
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];
}
-(BOOL)shouldAutorotate {
if ([[self.viewControllers lastObject]isKindOfClass:[NewViewController class]]) {
return YES;
}
return NO;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
if ([[self.viewControllers lastObject]isKindOfClass:[NewViewController class]]) {
return UIInterfaceOrientationMaskLandscapeLeft;
}
return UIInterfaceOrientationMaskPortrait;
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
if ([[self.viewControllers lastObject]isKindOfClass:[NewViewController class]]) {
return UIInterfaceOrientationLandscapeLeft;
}
return UIInterfaceOrientationPortrait;
}
强制横屏：
- (void)setInterfaceOrientation:(UIInterfaceOrientation)orientation {
if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
SEL selector = NSSelectorFromString(@"setOrientation:");
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
[invocation setSelector:selector];
[invocation setTarget:[UIDevice currentDevice]];
int val = orientation;
[invocation setArgument:&val atIndex:2];
[invocation invoke];
}
}
- (void)setInterfaceOrientation:(UIDeviceOrientation)orientation {
if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
[[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:orientation] forKey:@"orientation"];
}
}