ios - 如何以横向模式打开 View Controller ？

Question

我有一个 TableView ，当在表中点击单元格时，我正在推送另一个 View Controller 如下:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

 UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle:nil];
 PriceChart *vc = [storyboard instantiateViewControllerWithIdentifier:@"pricechart"];
 [self.navigationController pushViewController:vc animated:YES];

 }

现在我的问题是:我要展示的 View Controller 应该处于横向模式，但它处于纵向模式。

另一个问题是当点击不同的单元格时如何打开不同的 View Controller 。我尝试使用 indexpath.row 但还有其他方法可以使用 storyboard 吗？

Answer 1

shouldAutorotate, supportedInterfaceOrientations, preferredInterfaceOrientationForPresentation

如果上述方法位于任何 UINavigationController 中，则它们不会被 UIViewController 调用。如果这些方法在 UINavigationController 中声明，那么它们将被调用。

为了解决这个问题，我们创建了一个类OrientationEnabledNavigation，它是UINavigationController的子类。然后在 OrientationEnabledNavigation 中实现了 shouldAutorotate, supportedInterfaceOrientations, preferredInterfaceOrientationForPresentation 方法。

OrientationEnabledNavigation.h

#import <UIKit/UIKit.h>

@interface OrientationEnabledNavigation : UINavigationController

@end

OrientationEnabledNavigation.m

#import "OrientationEnabledNavigation.h"

@interface OrientationEnabledNavigation ()

@end

@implementation OrientationEnabledNavigation

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

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

- (BOOL)shouldAutorotate
{
    return [self.topViewController shouldAutorotate];
//    return NO;
}

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

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return [self.topViewController preferredInterfaceOrientationForPresentation];
}

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

@end

然后如果你想在你的项目中使用导航 Controller 然后使用OrientationEnabledNavigation。之后，如果您在 View Controller 中实现 shouldAutorotate、supportedInterfaceOrientations、preferredInterfaceOrientationForPresentation 这些方法，那么它们将被调用。

在你的 viewcontroller 中实现这些:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

-(BOOL)shouldAutorotate
{
    return NO;
}

-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}

另一种方法是在您的应用程序委托(delegate)的开头添加一些代码:

对于 UITabBarController

@implementation UITabBarController (AutoRotationForwarding)

-(BOOL)shouldAutorotate
{
    if ([self.selectedViewController respondsToSelector:@selector(shouldAutorotate)]) {
        return [self.selectedViewController shouldAutorotate];
    }
    else {
        return YES;
    }
}

- (NSUInteger)supportedInterfaceOrientations {
    if ([self.selectedViewController respondsToSelector:@selector(supportedInterfaceOrientations)]) {
        return [self.selectedViewController supportedInterfaceOrientations];
    }
    else {
        return UIInterfaceOrientationMaskAll;
    }
}

@end

对于 UINavigationController

@implementation UINavigationController (AutoRotationForwarding)

-(BOOL)shouldAutorotate
{
    if ([self.topViewController respondsToSelector:@selector(shouldAutorotate)]) {
        return [self.topViewController shouldAutorotate];
    }
    else {
        return YES;
    }
}

-(NSUInteger) supportedInterfaceOrientations {
    if([self.topViewController respondsToSelector:@selector(supportedInterfaceOrientations)])
    {
        return [self.topViewController supportedInterfaceOrientations];
    }
    return UIInterfaceOrientationMaskPortrait;
}

@end

希望这会有所帮助..:)