Question

我现在拼命地尝试2h来查找我的代码中的错误，该错误导致我没有显示我已实现的SplitViewController。奇怪的是，没有显示编译错误，并且所有链接和依赖关系似乎都是正确的。

首次加载时屏幕上没有任何内容显示。但是当我旋转设备时，我看到了正确的视图。但是在启动时，即使所有视图都已连接，也根本没有视图。

我只是让它的一部分工作...我发现调试器，第一个视图控制器没有在启动时加载。因此拆分视图的视图控制器数组没有填充初始视图控制器......我该如何解决？

我检查的第一部分是我的AppDelegate：

#import "AppDelegate.h"
#import "RootViewController.h"

@implementation AppDelegate

@synthesize window = _window;
@synthesize splitViewController = _splitViewController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSLog(@"%s %d", __PRETTY_FUNCTION__, __LINE__);
    [[self window] addSubview:self.splitViewController.view];
    [self.window makeKeyAndVisible];

    return YES;
}



@end

第一视图控制器

#import "FirstViewController.h"

@implementation FirstViewController
@synthesize toolbar;


#pragma mark -
#pragma mark View Lifecycle

- (void)viewDidUnload
{
    [super viewDidUnload];
    self.toolbar = nil;
}


#pragma mark -
#pragma mark Managing the Popover

- (void)showRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem
{
    NSMutableArray *itemsArray = [toolbar.items mutableCopy];
    [itemsArray insertObject:barButtonItem atIndex:0];
    [toolbar setItems:itemsArray animated:NO];
}

- (void)invalidateRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem
{
    NSMutableArray *itemsArray = [toolbar.items mutableCopy];
    [itemsArray removeObject:barButtonItem];
    [toolbar setItems:itemsArray animated:NO];
}

#pragma mark -
#pragma mark Rotation support

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


@end

我检查的第二部分是我的RootViewController。问题是，当你点击tableView Entry时，应该加载并显示一个新的视图控制器。所以我没有在我的app Delegate中实例化VC，而是在“did select row”表视图委托方法中。

这是rootviewcontroller：

#import "RootViewController.h"
#import "FirstViewController.h"
#import "SecondViewController.h"

@implementation RootViewController
@synthesize popoverController, splitViewController, rootPopoverButtonItem;


#pragma mark -
#pragma mark View Lifecycle

- (void)viewDidLoad
{
    NSLog(@"%s %d", __PRETTY_FUNCTION__, __LINE__);
    [super viewDidLoad];
    self.contentSizeForViewInPopover = CGSizeMake(310.0, self.tableView.rowHeight * 2.0);
}

- (void)viewDidUnload
{
    NSLog(@"%s %d", __PRETTY_FUNCTION__, __LINE__);
    [super viewDidUnload];
    self.splitViewController = nil;
    self.rootPopoverButtonItem = nil;
}


#pragma mark -
#pragma mark Rotation support

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    NSLog(@"%s %d", __PRETTY_FUNCTION__, __LINE__);
    return YES;
}


#pragma mark -
#pragma mark SplitViewController delegates

- (void)splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)pc
{
    NSLog(@"%s %d", __PRETTY_FUNCTION__, __LINE__);
    barButtonItem.title = @"PolyCube Prototypes";

    self.popoverController = pc;
    self.rootPopoverButtonItem = barButtonItem;

    UIViewController <SubstitutableDetailViewController> *detailViewController = [splitViewController.viewControllers objectAtIndex:1];
    [detailViewController showRootPopoverButtonItem:rootPopoverButtonItem];
}

- (void)splitViewController:(UISplitViewController *)svc willShowViewController:(UIViewController *)aViewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem
{
    NSLog(@"%s %d", __PRETTY_FUNCTION__, __LINE__);
    self.popoverController = nil;
    self.rootPopoverButtonItem = nil;

    UIViewController <SubstitutableDetailViewController> *detailViewController = [splitViewController.viewControllers objectAtIndex:1];
    [detailViewController invalidateRootPopoverButtonItem:rootPopoverButtonItem];
}



#pragma mark -
#pragma mark Table View Data Source

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSLog(@"%s %d", __PRETTY_FUNCTION__, __LINE__);
    return 2;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"%s %d", __PRETTY_FUNCTION__, __LINE__);
    static NSString *CellIdentifier = @"RootViewControllerIdentifier";

    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    if (indexPath.row == 0) {
        cell.textLabel.text = @"PolyCube 1";
    }
    else {
        cell.textLabel.text = @"PolyCube 2";
    }

    return cell;
}


#pragma mark -
#pragma mark - Table View Selection

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"%s %d", __PRETTY_FUNCTION__, __LINE__);
    NSUInteger row = indexPath.row;

    UIViewController <SubstitutableDetailViewController> *detailViewController = nil;

    if (row == 0) {
        FirstViewController *newDetailViewController = [[FirstViewController alloc] initWithNibName:@"FirstDetailView" bundle:nil];
        detailViewController = newDetailViewController;
    }


    if (row == 1) {
        SecondViewController *newDetailViewController = [[SecondViewController alloc] initWithNibName:@"SecondDetailView" bundle:nil];
        detailViewController = newDetailViewController;
    }


    NSArray *vcs = [[NSArray alloc] initWithObjects:self.navigationController, detailViewController, nil];
    splitViewController.viewControllers = vcs;

    if (popoverController != nil) {
        [popoverController dismissPopoverAnimated:YES];
    }

    if (rootPopoverButtonItem != nil) {
        [detailViewController showRootPopoverButtonItem:self.rootPopoverButtonItem];
    }
}

@end

我真的很感激帮助...我不知道在哪里看。我甚至检查了所有IB连接......我认为没有错。但仍然只是一个白色的屏幕。

非常感谢你塞巴斯蒂安

Answer 1

预期这种行为。如果您没有设置UISplitViewController的委托，那么主视图在纵向模式下将不可见。您的主视图从未加载，您在其中看到的白色屏幕是您的详细信息视图。

因此，您需要实现自己的UISplitViewController（创建一个新的UIViewController并将其更改为UISplitViewControlle。不要忘记将它在Storyboard中分配给您的拆分视图）

同样在界面中，使其实现并在viewDidLoad方法中将委托设置为self。

此协议将告知放置主表的位置。你想要它在拆分模式下划分窗口吗？或者你可能想要一个按钮（通常在一个标签栏中），当你按下它时，主窗口弹出窗口？

例如，实现这个人让主视图始终可见：

INTERFACE：

#import <UIKit/UIKit.h>

@interface SplitViewController : UISplitViewController <UISplitViewControllerDelegate>

@end

实施

#import "SplitViewController.h"

@interface SplitViewController ()

@end

@implementation SplitViewController


- (void)viewDidLoad
{
    [super viewDidLoad];
    [self setDelegate:self];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

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

-(BOOL)splitViewController:(UISplitViewController *)svc shouldHideViewController:(UIViewController *)vc inOrientation:(UIInterfaceOrientation)orientation{
    return NO;
}


@end

如果您不想实现自己的UISplitViewController只是为了处理委托，您也可以让任何主控制器或细节控制器实现它并在故事板中分配它（尝试从分割中拖动和拖动）查看任何控制器并将其设置为委托，不要忘记首先实现协议）

SplitViewController未显示

1 个答案: