UITableViewController与UIViewController的区别

初入iOS开发，在使用TableView 的时候，发现有两种创建 ViewController 的方式。

方式一：直接继承自 UIViewController

#import <UIKit/UIKit.h>

@interface FisrtViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>

@end

方法二：继承自 UIViewController

#import <UIKit/UIKit.h>

@interface FirstViewController : UITableViewController

@end

两者的区别在于，UITableViewController 帮忙做了一些 UIViewController 没有做的事情，如下：

Defines and setups up theUITableView.

Sets itself as the table view's data source and delegate.
Overrides thesetEditing:animated: method
to also set theediting property of the table view.
Deselects the last selected row in theviewWillAppear: method
depending on theclearsSelectionOnViewWillAppear property.

Flashes the table view's scrollbars in the viewDidAppear: method.

Hooks up the refresh control (as of iOS 6).

Reloads the table view the first time it's loaded.

Adjusts the table view'scontentInset (as of iOS 7).

Scrolls the table view as needed when the keyboard appears.

那么，什么时候该使用UIViewController呢？

You need the table view to be inside another view.
You need to add additional views to the view controller that don't scroll with the table view (though there are ways to solve this
with UITableViewController).