Bits of knowledge

#import <UIKit/UIKit.h>

@interface CustomNavigationController : UINavigationController

@property(nonatomic)NSUInteger orietation; 

#import "CustomNavigationController.h"

@interface CustomNavigationController ()

@end

@implementation CustomNavigationController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {

    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

//當前viewcontroller是否支持轉屏
-(BOOL)shouldAutorotate
{
    return NO;
    
}

//當前viewcontroller支持哪些轉屏方向
-(NSUInteger)supportedInterfaceOrientations{
    //return UIInterfaceOrientationMaskLandscapeRight;
    return self.orietation;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != self.orietation);
}