Question

我已经将UIViewController类子类化，如下面的代码所示。下面编码的视图控制器由Storyboard在TabBarController中实例化，但其视图（我使用Interface Builder添加的标签，工具栏）未显示。显示的唯一项目是TabBarControllers标签栏。

·H：

@interface FinstatViewController : UIViewController <SplitViewBarButtonItemPresenter,UISplitViewControllerDelegate>
@property (nonatomic, strong) UIBarButtonItem *splitViewBarButtonItem;
@property (weak, nonatomic) IBOutlet UINavigationBar *toolbar;
@end

的.m：

#import "FinstatViewController.h"

@interface FinstatViewController ()

@end

@implementation FinstatViewController
@synthesize splitViewBarButtonItem = _splitViewBarButtonItem;   // implementation of SplitViewBarButtonItemPresenter protocol

@synthesize toolbar = _toolbar;                                 // to put splitViewBarButtonItem in

- (void)setSplitViewBarButtonItem:(UIBarButtonItem *)splitViewBarButtonItem
{
    if (splitViewBarButtonItem != _splitViewBarButtonItem) {
        NSMutableArray *toolbarItems = [self.toolbar.items mutableCopy];
        if (_splitViewBarButtonItem) [toolbarItems removeObject:_splitViewBarButtonItem];
        if (splitViewBarButtonItem) [toolbarItems insertObject:splitViewBarButtonItem atIndex:0];
        self.toolbar.items = toolbarItems;
        _splitViewBarButtonItem = splitViewBarButtonItem;
    }
}

- (void)awakeFromNib  // always try to be the split view's delegate
{
    [super awakeFromNib];
    self.splitViewController.delegate = self;
}


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

- (void)loadView
{
    // If you create your views manually, you MUST override this method and use it to create your views.
    // If you use Interface Builder to create your views, then you must NOT override this method.
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    //self.splitViewController.delegate=self;
    // Do any additional setup after loading the view, typically from a nib.
}

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

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

@end

我错了什么？

谢谢！

Answer 1

阅读此方法的注释，然后完全删除该方法：

- (void)loadView
{
    // If you create your views manually, you MUST override this method and use it to create your views.
    // If you use Interface Builder to create your views, then you must NOT override this method.
}

您根本没有视图（即self.view），因为您没有创建视图，因此您的viewController显示为空。如果要在代码中创建视图，可以使用- loadView。但是您使用故事板来创建视图，因此您不能使用- loadView

这不是你的错，责怪Apple。打开Xcode 4.3 UIViewController模板当你取消选中“使用XIB for User Interface”时，苹果的一些聪明人认为你想在代码中创建你的视图。他可能完全错过了故事板宣布。

删除该部分后，请考虑在http://bugreport.apple.com/

提交错误

编辑：Xcode 4.3.2修复了这个错误。该模板不再包含- (void)loadView

Subclassed UIViewController未显示

1 个答案: