如何使用Interface Builder创建带有UINavigationController的UIViewController？ [英] How to create an UIViewController with UINavigationController with Interface Builder?
问题描述
在我的iOS应用程序中，我想提供一个设置视图。 presentModalViewController非常有效：
In my iOS application, I want to provide a settings-view. "presentModalViewController" works very well:
ViewSettings *controller = [[ViewSettings alloc] initWithNibName:@"ViewSettings" bundle:nil];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:controller];
[self.navigationController presentModalViewController:navController animated:YES];
[controller release];
[navController release];
不幸的是，我必须更改运行代码并创建ViewSettings，包括Interface Builder中的UINavigationController。为什么？长话故事，我将在这个帖子的最后解释...
Unfortunately, I have to change my running code and create the ViewSettings including the UINavigationController in Interface Builder. Why? Long story, I'll explain it in the end of this thread...
我尝试在我的ViewSettings中拖放UINavigationController并创建一个IBOutlet来访问它在我班上我将此控制器提供给presentModalViewController，但应用程序崩溃...
I try to drag and drop an UINavigationController in my ViewSettings and create an IBOutlet to access it in my class. I give this controller to "presentModalViewController" but the application crashed...
我做错了什么？
错误消息： GDB：程序收到信号：SIGABRT。
错误发生在此代码的最后一行：
Error Message: GDB: Program received signal: "SIGABRT".
The error happens in the last line of this code:
ViewSettings *viewSettings = [[ViewSettings alloc] initWithNibName:@"ViewSettings" bundle:nil];
UINavigationController *navController = viewSettings.navigationController;
UINavigationBar *navBar = navController.navigationBar;
OwnNavigationBar *ownNavBar = (OwnNavigationBar *)navBar;
[ownNavBar drawHeaderImage:YES];
[self.navigationController presentModalViewController:navController animated:YES];
详细错误：由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：'应用程序已尝试在目标上展示一个零模态视图控制器。'
[/ EDIT]
感谢您的帮助！
是的，navigationController是nil ...
我想我以错误的方式添加UINavigationController ...我把它放在这个窗口中，因为它不可能直接放在我的视图中：
如何正确添加UINavigationController？
[/ EDIT2]
我的UINavigationBar中需要一个背景图片。我的第一次尝试是：
I need an background image in my UINavigationBar. My first try was:
UIImage *image = [UIImage imageNamed: @"header.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
[self.navigationController.navigationBar addSubview:imageView];
[self.navigationController.navigationBar sendSubviewToBack:imageView];
但在某些问题上，UIBarButton的标题不可见！我尝试了很多，例如在每个视图中设置视图的标记和sendSubviewToBack，但没有成功。这是一个非常烦人的错误！
But in some issues, the title oder a UIBarButton is not visible! I tried a lot, e.g. sets the "tag" of the view and sendSubviewToBack in each view, but no success. This is a very annoying bug!
我的第二次尝试是创建一个类别并覆盖drawRect方法：
My second try was to create a category and overwrite the drawRect-method:
@implementation UINavigationBar(MyNavigationBar)
- (void)drawRect:(CGRect)rect {
UIImage *image = [UIImage imageNamed: @"header.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
@end
但现在，我的所有UINavigationBars都有背景图像，我无法停用它。问题是，ViewSettings需要背景图像，但后面的推送视图不需要。
But now, all of my UINavigationBars have an background image and I can't deactivate it. The problem is, that "ViewSettings" needs the background image, but the following pushed views do not.
不幸的是，无法在类别中设置属性或者调用[super drawRect：rect]以避免绘制图像。
Unfortunately, it isn't possible to set a property in a category or call [super drawRect:rect] to avoid painting the image.
我的最后一次尝试是写一个自己的UINavigationBar
My last try is to write an own UINavigationBar
@interface OwnNavigationBar : UINavigationBar {
BOOL _drawHeaderImage;
}
现在我可以控制drawRect方法!!太棒了！
Now I can control the drawRect-method!! GREAT!!
- (void)drawRect:(CGRect)rect {
if (_drawHeaderImage) {
UIImage *image = [UIImage imageNamed: @"header.png"];
[image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
else {
[super drawRect: rect];
}
}
但我很早就庆祝...... :-(
无法在UINavigationController中设置自己的UINavigationBar !!!
UINavigationController中的navigationBar是一个只读属性！
AAAAHHHHHHHHHH！
But I celebrate to early... :-( It isn't possible to set an own UINavigationBar in the UINavigationController!!! "navigationBar" in UINavigationController is a read-only property! AAAAHHHHHHHHHH!
我有最后一次机会：在Interface Builder中，可以为UINavigationController提供一个自己的UINavigationBar !!
是的！我知道它!!： - ）
I have one last chance: in Interface Builder it is possible to give an UINavigationController an own UINavigationBar!! YES! I GOT IT!! :-)
我在我的MainWindow_iPhone.xib中进行了配置，效果很好！
现在，我必须为我的ViewSettings实现这个，因为这个（模态）视图需要一个新的UINavigationController。
I configured it in my MainWindow_iPhone.xib and it works great! Now, I have to implement this for my ViewSettings, because this (modal) view needs a new UINavigationController.
PS：也许，有人可以将此线程发送给Apple，这一切都是非常烦人的情况和错误： - （
推荐答案
当你初始化时从一个笔尖查看控制器，它实际上并没有立即加载笔尖，所以 viewSettings.navigationController 仍然是零。第一次引用视图属性，将加载笔尖。
When you init a view controller from a nib, it does not actually load the nib right away, so viewSettings.navigationController is still nil. The first time you reference the view property, the nib will be loaded.
更新
您可以自己加载笔尖并抓住导航控制器，如下所示：
You could load the nib yourself and grab the navigation controller, like so:
UINavigationController *navController = [[[NSBundle mainBundle] loadNibNamed:@"ViewSettings" owner:self options:nil] objectAtIndex:1];
I在索引1处使用了对象，因为在你的截图中有一个tableview，我认为它将是索引0。
I used object at index 1 because in your screenshot there's a tableview which I think will be index 0.
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