categories | 易学教程

Swizzling a single instance, not a class

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问题 I have a category on NSObject which supposed to so some stuff. When I call it on an object, I would like to override its dealloc method to do some cleanups. I wanted to do it using method swizzling, but could not figure out how. The only examples I've found are on how to replace the method implementation for the entire class (in my case, it would override dealloc for ALL NSObjects - which I don't want to). I want to override the dealloc method of specific instances of NSObject. @interface

Magento - get filterable attributes by category

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问题 I have created a custom navigation module specifically for a website, but I really want to be able to list filterable attributes by a specific category. So for instance my main navigation is: Category 1 Category 2 Category 3 etc. I then that when a user mouses over a category, they are then presented with an expanded menu with a few filterable options e.g.: Category 1 View by manufacturer: Manufacturer 1 Manufacturer 2 Manufacturer 3 etc. I am able to get all filterable attributes for the

Display ALL categories that a product belongs to in Magento

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I am conceptualizing a new Magento site which will have products that are included in several categories. What I am wondering is if I can display all categories a product is in on the product detail page. I know that it is possible to get the category, but is it possible to display a list of all categories which a product belongs to? For example, a shirt may be included in the Shirts category, as well as in Designers and Summer . Ideally, I would like to be able to display the following: More from: Men > Shirts Men > Designers > Barnabé Hardy Men > Summer This will get you the data you are

Android - Headers categories in PreferenceActivity with PreferenceFragment

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I would like to display a preference screen like the one in the Android settings app : using headers, PreferenceActivity, PreferenceFragment and headers categories. I wan't this result on a tablet : And this one on a smartphone : It works if I just use the basic headers, but if I try to add categories, it works on the smartphone, and crash on the tablet, where I get the exception "java.lang.NullPointerException: name == null" : FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{fr.ifremer.testandroid/fr.ifremer.testandroid.models.preferences

MAGENTO - Display sub-category products in root category

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问题 i havent been able to find the answer for this anywhere but i cant seen to display any of the products on the root categories page from its sub category members. When i click the category from the top navigation i get the sub categories on the left and on the right (main content) “There are no products matching the selection”. Each sub-cat. shows its products though. In Admin -> Catalog -> Manage Categories each category shows the number of products i.e (4) however its root category displays

Objective-C accessor declarations (readonly, readwrite, etc)

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问题 In the book, "Cocoa Design Patterns," the author sometimes declares a property in the @interface as readonly: // .h @property (readonly, copy) NSArray *shapesInOrderBackToFront; and then later adds an unnamed category to the implementation (.m) file like this: // .m @interface MYShapeEditorDocument () @property (readwrite, copy) NSArray *shapesInOrderBackToFront; @end Any idea as to why? It's unclear to me how this approach is better than, or more necessary than, initially declaring the

Since when is it possible to declare Objective-C 2.0 properties in a category?

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I always thought that one cannot declare an object property in a category. Until my partner did it in our app's code, and it seemed to work. I went on a SO and Google binge to try to explain to him that no, Objective-C categories can only be used to add methods, not properties. I found questions such as: Setting New Property In Category Interface Implementation (look at the accepted answer) Can I add a property for a method not in my category? But then I found this link on Apple's site that contains the following about the @property declaration: A property declaration begins with the keyword

WP_Query Woocommerce products that belong in distinct multiple categories only tax_query

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问题 I'm using WP_Query for Woocommerce products in attempt to query products in a particular category. This is the syntax that worked for me - $args = array( 'posts_per_page' => -1, 'product_cat' => 'category-slug-here', 'post_type' => 'product', 'orderby' => 'title', ); $the_query = new WP_Query( $args ); // The Loop while ( $the_query->have_posts() ) { $the_query->the_post(); echo '' . get_the_title() . '<br /><br />'; } wp_reset_postdata(); This returns data, but I want to pass an ID, not a

How to get a category listing from Magento?

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问题 I want to create a page in Magento that shows a visual representation of the categories.. example CATEGORY product 1 product 2 ANOTHER CATEGORY product 3 My problem is, their database is organised very differently to what I've seen in the past. They have tables dedicated to data types like varchar, int, etc. I assume this is for performance or similar. I haven't found a way to use MySQL to query the database and get a list of categories. I'd then like to match these categories to products, to

What kind of category methods do you use to make Cocoa programming easier?

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问题 I use a collection of category methods for Cocoa's built in classes to make my life easier. I'll post some examples, but I really want to see what other coders have come up with. What kind of handy category methods are you using? Example #1: @implementation NSColor (MyCategories) + (NSColor *)colorWithCode:(long)code { return [NSColor colorWithCalibratedRed:((code & 0xFF000000) >> 24) / 255.0 green:((code & 0x00FF0000) >> 16) / 255.0 blue:((code & 0x0000FF00) >> 8) / 255.0 alpha:((code &