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原文地址：http://blog.csdn.net/dizzthxl/article/details/9031255
UIViewController initWithNibName
这时候是延迟加载
主要代码如下：
ShowViewController * showMessage = [[ShowViewController alloc]
initWithNibName:@"ShowViewController" bundle:nil];
self.showViewController = showMessage;
[showMessage release];
这时候是延迟加载，这个View上的控件是 nil 的
self.showViewController.show_Topic
只有到 需要显示时，才会不是 nil
[saveViewController.view removeFromSuperview];
[self.view insertSubview:showViewController.view atIndex:0];
这时候 xib 文件的要求：
NSBundle loadNibNamed
实时加载。
这时候的代码：
NSArray * nib = [[NSBundle mainBundle] loadNibNamed:@"Save3ViewController"
owner:self options:nil] ;
self.showViewController = [nib lastObject];
这时候的xib文件
如果用 loadNibNamed 加载 initWithNibName 用到格式的 xib 文件，就会报错误：
setValue:forUndefinedKey
loaded the...nib but the view outlet was not set
loadNibNamed和initWithNibName需要加载的xib文件是不一样的。initWithNibName需要加载的xib文件的File Owner应改是需要加载的类，
而loadNibNamed需要加载的xib文件的File Owner为NSObject。
http://www.cnblogs.com/GoGoagg/archive/2011/06/09/2076456.html
when using loadNibNamed:owner:options:, the File‘s Owner should be NSObject, the main view should be your class type, and all outlets should be hooked up to the view, not the File‘s Owner.
http://stackoverflow.com/questions/46220/iphone-app-crashing-error-question
参考资料：
从xib/nib加载UIViewController/或其子类
http://www.cnblogs.com/GoGoagg/archive/2011/06/09/2076456.html
iPhone App Crashing - Error Question
http://stackoverflow.com/questions/46220/iphone-app-crashing-error-question
initWithNibName 和 loadNibNamed 的区别
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原文地址：http://www.cnblogs.com/whqios/p/4543264.html
