将委托方法放入类别 [英] Put delegate methods into a category

问题描述

我开发了一些应用程序，直到现在。现在我正在写一个新的，在这个项目中，我想保持代码非常干净，所以很容易找到方法。

我想从 UIViewControllers 其视图具有 UITableView 作为子视图。我希望有一个文件名为 DetailViewController 的所有直接属于它的函数。另一个名为 DetailViewController + Protocols 的文件应该包含上面的类别和所有这些委托方法 UITableView 。

是否可以这样做？

EDIT p>

DetailViewController.h

  @interface DetailViewController：UIViewController 
 
 ...一些属性
 
 ...一些方法
 
 @end 
  

DetailViewController.m

  #importDetailViewController.h
 
 @implementation DetailViewController 
 
 ...一些合成
 
 ...一些方法
 
 @end 
  

DetailViewController + Protocols.h

  @ interface DetailViewController（Protocols）< UITableViewDelegate，UITableViewDataSource> 
 
 @end 
  

DetailViewController + Protocols.m

  @implementation DetailViewController（Protocols）
 
  - （NSINteger）numberOfSections 
 {
 return ... ; 
} 
 
  - （NSInteger）numberOfRowsInSection：（NSInteger）section 
 {
 if（section == 0）
 return ...; 
 
 return ...; 
} 
 
 ... 
 
 @end 
  

但是，然后Xcode显示一个警告，一些委托方法没有实现在DetailViewController。我也尝试导入 DetailViewController + Protocols.h 在 DetailViewController.h 。没有变化。

然后我试过忽略警告，看到：它工作！但为什么？难道不应该在没有这些警告的情况下工作吗？

解决方案

唯一要记住的类别是，你不能 @synthesize 中的属性。

请参阅此了解详情。

I developed some application 'till now. Now I'm writing a new one and in this project I want to keep the code very clean, so it's very easy to find the methods.
I want to start with the UIViewControllers whose view have a UITableView as subview. I wish to have a file with the name DetailViewController for all functions which belong directly to it. Another file with the name DetailViewController+Protocols should contain a category of the class above and all these delegate methods of UITableView.

Is it possible to do something like this? I want to keep my code clean and split it into multiple files.

---

EDIT

DetailViewController.h

@interface DetailViewController : UIViewController

... Some Properties

... Some Methods

@end

DetailViewController.m

#import "DetailViewController.h"

@implementation DetailViewController

... Some Synthesizes

... Some Methods

@end

DetailViewController+Protocols.h

@interface DetailViewController (Protocols) <UITableViewDelegate, UITableViewDataSource>

@end

DetailViewController+Protocols.m

@implementation DetailViewController (Protocols)

- (NSINteger)numberOfSections
{
    return ...;
}

- (NSInteger)numberOfRowsInSection:(NSInteger)section
{
    if (section == 0)
        return ...;

    return ...;
}

...

@end

But then Xcode shows a warning that some of the delegate methods are not implemented in DetailViewController. I also tried it with importing the DetailViewController+Protocols.h in the DetailViewController.h. No changing.
Then I tried it with ignoring the warnings and see: It worked! But why? Shouldn't it work without these warnings?

解决方案

Yes it is. The only thing to keep in mind with categories is that you cannot @synthesize properties in them. Adding ivars in categories is more difficult as well.

See this for more info on that.

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