在ios6以後,ios系統改變了螢幕旋轉的方法,如果要設定螢幕旋轉的方法,需要在rootvc裡面進行編寫,例如

UIViewController *viewCtrl = [[UIViewController alloc] init];  
UINavigationController *navCtrl = [[UINavigationController alloc] initWithRootViewController:viewCtrl];  
if ([window respondsToSelector:@selector(setRootViewController:)]) {  
    self
 
.window.rootViewController = navCtrl;  
} else {  
    [self.window addSubview:navCtrl.view];  
} 

UITabBarController+autoRotate 

@interface UITabBarController (autoRotate)

-(BOOL)shouldAutorotate;
- (NSUInteger)supportedInterfaceOrientations;

@end


#import "UITabBarController+autoRotate.h"

@implementation UITabBarController (autoRotate)

- (BOOL)shouldAutorotate {
return [self.selectedViewController shouldAutorotate];
}
- (NSUInteger
 
)supportedInterfaceOrientations {
return [self.selectedViewController supportedInterfaceOrientations];
}

@end

@interface UINavigationController (autoRotate)

-(BOOL)shouldAutorotate;
- (NSUInteger)supportedInterfaceOrientations;

@end

@implementation UINavigationController (autoRotate)

- (BOOL)shouldAutorotate {
return [self.visibleViewController shouldAutorotate];
}

- (NSUInteger)supportedInterfaceOrientations {
return [self.visibleViewController supportedInterfaceOrientations];
}

@end

UIViewController1.m

- (BOOL)shouldAutorotate {
 return NO;
}
- (NSUInteger)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskPortrait;;
}
UIViewController2.m

- (BOOL)shouldAutorotate {
return YES;
}
- (NSUInteger)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskAll;
}