ios - 无法在 ios 中调整横向 View

Question

我正在使用标签栏 Controller 并处理登录和注销功能。下面是在 iPad 横屏模式下调整 tableViewCell 的代码。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *cellId = @"collabId";
    emptyCell *cell = (emptyCell *)[self.tableViewJoined dequeueReusableCellWithIdentifier:cellId];
    if(!cell)
    {
        NSArray *nib;
        UIButton *buttonList;
        UIButton *buttonAttachment;
        if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
        {
            nib = [[NSBundle mainBundle] loadNibNamed:@"emptyCell" owner:self options:nil];
            buttonList = [[UIButton alloc] initWithFrame:CGRectMake(199, 0, 30, 25)];
            buttonAttachment = [[UIButton alloc] initWithFrame:CGRectMake(290, 0, 30, 25)];
        }
        else
        {
            if(UI_USER_INTERFACE_IDIOM() == UIDeviceOrientationPortrait)
            {
                nib = [[NSBundle mainBundle] loadNibNamed:@"emptyCell_iPad" owner:self options:nil];
                buttonList = [[UIButton alloc] initWithFrame:CGRectMake(452, 0, 62, 25)];
                buttonAttachment = [[UIButton alloc] initWithFrame:CGRectMake(650, 0, 98, 25)];
            }
            else if(UI_USER_INTERFACE_IDIOM() == UIDeviceOrientationLandscapeLeft || UI_USER_INTERFACE_IDIOM() == UIDeviceOrientationLandscapeRight)
            {
                nib = [[NSBundle mainBundle] loadNibNamed:@"emptyCell_iPad_Landscape" owner:self options:nil];
                buttonList = [[UIButton alloc] initWithFrame:CGRectMake(591, 0, 81, 24)];
                buttonAttachment = [[UIButton alloc] initWithFrame:CGRectMake(850, 0, 128, 24)];
            }
        }

        for (id object in nib)
        {
            if([object isKindOfClass:[emptyCell class]])
            {
                cell = (emptyCell *)object;
                break;
            }
        }


        [buttonList addTarget:self action:@selector(buttonListClicked:) forControlEvents:UIControlEventTouchUpInside];

        [buttonList setTag:indexPath.row];
        [cell.contentView addSubview:buttonList];


        [buttonAttachment addTarget:self action:@selector(buttonAttachmentClicked:) forControlEvents:UIControlEventTouchUpInside];

        [buttonAttachment setTag:indexPath.row];
        [cell.contentView addSubview:buttonAttachment];

        cell = [nib objectAtIndex:0];
        SaveCollaboration *saveCollab = [mutableArray objectAtIndex:indexPath.row];
        cell.name.text = saveCollab.name;
        cell.project.text = saveCollab.project;
        cell.date.text = saveCollab.date;
        cell.invites.text = [NSString stringWithFormat:@"%d", saveCollab.invites];
        cell.docsCount.text = [NSString stringWithFormat:@"%d", saveCollab.docsCount];
    }

    return cell;

}

我注意到的一件事是，对于登录用户的第一页，每当我更改其方向时，都会调用以下 AppDelegate 方法三次。其他页面不给下面的方法log三次。

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    NSLog(@"Orientation changed"); //Gets invoked thrice. Is this the reason why landscape cells don't get invoked?
    return  UIInterfaceOrientationMaskAllButUpsideDown;
}

我在

nib = [[NSBundle mainBundle] loadNibNamed:@"emptyCell_iPad_Landscape" owner:self options:nil];

但它从未被调用过。
当用户成功登录时，您可以引用以下委托(delegate)方法。
我检查了 emptyCell_iPad_Landscape 的标识符 Nib 和自动布局未选中。

- (void)viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];

    AppDelegate *delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
    BOOL getFlag = delegate.flagToCheckLogin;
    if(!getFlag)
    {


        if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
        {
            ViewController *viewController = [[ViewController alloc] initWithNibName:@"ViewController_iPad" bundle:Nil];
            viewController.delegate = self;

            [self presentViewController:viewController animated:NO completion:nil];
        }
        else
        {
            ViewController *viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:Nil];
            viewController.delegate = self;

            [self presentViewController:viewController animated:NO completion:nil];
        }
    }


}

登录类中有以下方法..

-(NSUInteger)supportedInterfaceOrientations
{


    return UIInterfaceOrientationMaskAllButUpsideDown;

}

-(BOOL)shouldAutorotate
{
    return YES;
}

Answer 1

我相信你在滥用 UI_USER_INTERFACE_IDIOM()功能。根据Apple Docs , UI_USER_INTERFACE_IDIOM() “返回当前设备支持的接口(interface)习惯用法。”通常，此函数用于确定设备是 iPhone 还是 iPad，但由于 UIDeviceOrientationPortrait事实上，正如您的应用程序委托(delegate)中所指定的那样，这种情况总是正确的，这是有道理的。 (这也可能是为什么 supportedInterfaceOrientationsForWindow: 在您的 appDelegate 中，正如您所说，“调用三次”......因为您多次请求 UI_USER_INTERFACE_IDIOM())。

而不是使用 UI_USER_INTERFACE_IDIOM() == ... ，您可以:

(1) 使用[[UIDevice currentDevice] orientation]检测设备的当前方向:

UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
if (orientation == UIDeviceOrientationPortrait) {
    …

} else if (orientation == UIDeviceOrientationLandscapeLeft || orientation == UIDeviceOrientationLandscapeRight) {

}

或者

(2) 使用[UIApplication sharedApplication].statusBarOrientation获取界面的当前方向:

UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
if (orientation == UIDeviceOrientationPortrait) {
    …

} else if (orientation == UIDeviceOrientationLandscapeLeft || orientation == UIDeviceOrientationLandscapeRight) {

}

请注意，解决方案 #1 和 #2 并不总是返回相同的结果。 #1 返回设备的当前方向。 #2 返回界面的当前方向。因此，根据您的需要，一种方法对您来说可能比另一种更可靠……我建议在您的情况下使用方法＃2。