在objective c中创建对象并设置其属性的最佳实践是什么

Considering I have a UIViewController called ErrorViewController that I am instantiating using initWithNibName.

考虑到我有一个叫做ErrorViewController的UIViewController我用initWithNibName实例化它。

There is a enum on this ErrorViewController describing its "type".

这个ErrorViewController上有一个enum，描述它的“类型”。

This ErrorViewController has one delegate function that returns to its delegate which will respond according to the type set on the ErrorViewController.

这个ErrorViewController有一个委托函数返回给它的委托它会根据ErrorViewController的类型集进行响应。

Is it better to pass all the parameters within a new initWithNibName function, and set private properties on the ErrorViewController. Like this:

在新的initWithNibName函数中传递所有参数，并在ErrorViewController上设置私有属性是否更好?是这样的:

ErrorViewController *errorVc = [[ErrorViewController alloc] 
initWithNibName:@"ErrorViewController" bundle:nil 
andErrorType:kErrorTypeA andDelegate:self];

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
andErrorType:(ErrorType)errorType andDelegate:(id<ErrorDelegate>)delegate{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        self.delegate = delegate;
        self.errorType = errorType;
    }
    return self;
}

Or is it better to instantiate the object and afterward set its public properties like this:

还是实例化对象，然后设置它的公共属性，比如:

ErrorViewController *errorVc = [[ErrorViewController alloc] 
initWithNibName:@"ErrorViewController" bundle:nil];
errorVc.delegate = self;
errorVc.type = kErrorTypeA.

And regarding the delegate method, is it best practice to check the type by passing a parameter, or by checking the property of the passed back Controller as follows:

对于委托方法，是通过传递一个参数来检查类型，还是通过如下方式检查传递回来的控制器的属性来检查类型:

- (void)ErrorPage:(ErrorViewController *)ErrorPage 
// check ErrorPage.errorType
}

or this: ?

或:?

- (void)ErrorPage:(ErrorViewController *)ErrorPage 
andErrorType:(ErrorType)errorType
// check errorType
}

1 个解决方案

#1

I think it's a question of preference. If the object can't function correctly without error-type and/or delegate, it's probably best to provide your custom initialiser.

我认为这是一个偏好问题。如果对象在没有错误类型和/或委托的情况下不能正常工作，那么最好提供自定义初始化器。

As to your second question, I would provide the error type as in your second example. Note that the method name should start with a lowercase character though (-errorPage: instead of -ErrorPage:).

关于第二个问题，我将提供第二个示例中的错误类型。注意，方法名应该以小写字符开头(-errorPage:而不是-errorPage:)。

Additionally, if you use it a lot, I would provide a convenience class method to create the object:

另外，如果您经常使用它，我将提供一个方便的类方法来创建对象:

+(ErrorViewController*) standardErrorViewControllerWithErrorType: (ErrorType) errorType andDelegate: (id<ErrorDelegate>) delegate {

  ErrorViewController *evc = [[ErrorViewController alloc] initWithNibName: @"ErrorViewController" bundle: nil andErrorType: errorType andDelegate: delegate];
return evc;
}

Edit

编辑

Also, in your init method, it is encouraged to use -(instancetype) init... instead of -(id) init....

另外，在init方法中，鼓励使用-(instancetype) init…(而不是)- id init ....

#1