1.如果vc都是通過xib來生成的，沒什么問題，但是如果只是直接init生成的話，UIViewController會(huì)在loadview的時(shí)候自動(dòng)創(chuàng)建一個(gè)view，賦值給vc的view，但是NSViewController不會(huì)自動(dòng)創(chuàng)建view，需要自己在loadview中創(chuàng)建view。如果NSViewController不創(chuàng)建view的話，雖然走了loadview方法，但是由于（Called after the view has been loaded.）self.view沒有被創(chuàng)建，所以導(dǎo)致viewDidLoad不會(huì)被創(chuàng)建！
/* Called after the view has been loaded. For view controllers created in code, this is after -loadView. For view controllers unarchived from a nib, this is after the view is set. Default does nothing.
*/
- (void)viewDidLoad NS_AVAILABLE_MAC(10_10);
未完待續(xù)......
