categories

问题 I want to add some class methods to UIColor. I've implemented them and everything compiles fine, but at runtime I get the following error: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[UIColor colorWithHex:]: unrecognized selector sent to class 0x8d1d68' Here's the header file: @interface UIColor (Hex) + (UIColor*) colorWithHex: (NSUInteger) hex; @end Here's the implementation: #import "UIColor+Hex.h" @implementation UIColor (Hex) + (UIColor*) colorWithHex

问题 I currently have a plugin that allows a user to activate/deactivate categories to drive a menu. I've created an option for the toggle and have it functioning in the create form and edit form seamlessly. The only place I can't seem to add it is to the AJAX return from wordpress when the category is created. I can create the column when the Categories page is loaded but don't know how to tap into the AJAX Return without modifying the core. Is there a hook that I'm unaware of that allows you to

问题 Suppose that I have the following vector: V<-c(-1,-1,1,1,1,-1,-1,1) And I want to know the number of different pairs in the following categories: (1,1), (-1,1), (1,-1), and (-1,-1) In my example, there is exactly 1 pair of each. I have been trying to solve this problem with the function split and setkey , but I can't do the categorization. 回答1: ng <- length(V)/2 table(sapply(split(V,rep(1:ng,each=2)),paste0,collapse="&")) # -1&-1 -1&1 1&-1 1&1 # 1 1 1 1 Here is a better alternative that also

问题 I have a tab set to add a tab which contains specifications in WooCommerce. I'd like to wrap it into an if statement to only set the tab if the product is part of a certain category. add_filter( 'woocommerce_product_tabs', 'woo_custom_product_tabs' ); function woo_custom_product_tabs( $tabs ) { global $post; if ($product->is_category("Mobile Phones")) { $tabs['custom_specification'] = array( 'title' => __( 'Specification', 'woocommerce' ), 'priority' => 50, 'callback' => 'woo_custom

问题 I would like to create some new UIColor s that are used in my app throughout. From time to time the RGB is slightly tweaked (the exact color shade is being debated) Currently I have to create the new colors from RGB and the code is sprinkled all over and repeated. Is there a better way where I can create a new color one and use that through out my app. [UIColor myNewCustomRedColor] What is the best pattern here - is Category the right choice - if so how? If no -what is the recommended

问题 I know it's not a great idea to try and place properties in a category. Can I access a class' instance variables from within a category that extends it? Or is it necessary to expose an accessor on the class being extended? For example, let's say I have a class called "Person" and its implementation looks like this: #import "Person.h" @interface Person() { NSMutableArray *_friends; } @end @implementation Person - (instancetype)init { self = [super init]; if (self) { _friends = [NSMutableArray

问题 I want to get all the child and grandchild categories of a parent category upto any level. My table structure goes like this. Can anyone suggest me how to get all the child categories (i.e. Samsung and S3 of phone category). 回答1: You need recursivity. Create a function like this (assuming you use active records): function getCategoriesByParentId($category_id) { $category_data = array(); $category_query = $this->db->query("SELECT * FROM categories WHERE parent_category = '" . (int)$category_id

问题 I'm trying to reduce the size of ~300 csv files (about a billion rows) by replacing lengthy fields with shorter, categorical, values. I'm making use of pandas, and I've iterated through each of the files to build an array that includes all of the unique values I'm trying to replace. I can't individually just use pandas.factorize on each file, because I need (for example) '3001958145' to map to the same value on file1.csv as well as file244.csv. I've created an array of what I'd like to

问题 I'm using Woocommerce settings to show categories thumbnail on the initial shop page and then products and their thumbnails within them. I want to have that initial category page to display 3 thumbnails per row and the products page to show 5 categories per row. To display 5 products per row I've used: add_filter('loop_shop_columns', 'loop_columns'); if (!function_exists('loop_columns')) { function loop_columns() { return 5; } } This changes the thumbnails per row on the category page AND on

问题 I need to list sibling categories in the category page in a Prestashop theme. Currently it does show the sub-categories if any but not the sibling categories. A quick answer would really be appreciated! Thanks. 回答1: For to start i would have created a override file in /override/controllers/, named CategoryController.php And add this: <?php class CategoryController extends CategoryControllerCore { public function displayContent() { // Get the global smarty object. global $smarty; // Get