category chooser

Catalog Chinese translation: directory; Category Chinese Translation: categories; Catalog is a list of items that have a certain order, or a list of classification systems.It can also be used as a verb to represent catalogs and to place entries in a directory. category is a category of people/things that have one or more common characteristics.catalogCan

1. Why should I have a category? Extending on the basis of existing classes can be implemented using both inheritance and composition, but why does OC have to have categories like this?Consider a scenario where a dictionary is created, key is a string, and value is the length of the string. The general practice is to: Nsmutabledictionary *dict = [nsmutabledictionary dictionary]; nsstring* str = @ "Hello"; nsnumber* NUM1 = [nsnumbe

Now, you can use the blog client software to send a document to the website category (including the homepage ), you only need to select the corresponding website category (the category name starts with "[website category]") in the category when sending the document, or you c

A category is a way to add useful functionality or methods to a class that can be a system class, a custom classCategories are not the same as subclasses, categories can only add some method property variables or not addYou can extend an existing class without creating a new classWorking with other programmers will work better when doing the project.The diagram for the new category is placed on the last sid

This article discusses the storage categories in C, including the storage of data in memory, the storage category of variables, the storage category of functions, and the life cycle. For the computer's storage space, there are registers and memory. One, storage area 1. Register: Stores data that participates in the operation immediately. 2. System Area: Storage System software. 3. User program code area: Th

[Reading Notes] iOS-category, Reading Notes ios- 1. Category is a way to add new methods to existing classes. Ii. Category limitations. 1. You cannot add new instance variables to the class. The category does not have a location to accommodate instance variables. 2. Name Conflict, that is, the method in the

Android. Intent. Category. LauncherWhat is the specific function? I will make a small example to help you understand An application can have multiple activities, each of which is at the same level. Which activity is the first to start when a program is started? Some programs may need to be displayed in the program list, while others do not. How to define it? Android. Intent. Action. Main determines the activity Android. Intent.

Obtain products under a multi-level category combination and categories This article is a Demo for the specific needs I encountered during the project process. There is no great versatility, and readers can bypass it as appropriate. The title cannot fully express the intention. The exact scenario needs to be expanded. Assume that there are three levels of classification. The design of classification is as follows: public class

When the content and classification of more, often use the top label navigation bar, such as the top of the NetEase News client category navigation, recently just have such a scenario, refer to some of the network demo, to achieve this navigation effect, record some points.(due to the video to GIF dropped frames, sliding and the next draw looks more blunt, just found that QuickTime can directly record mobile video, recommend, very convenient)1. Top ta

I want to get the category of the current article in the Custom posttype of wordpress. The classification is also defined by register_taxonomy. {Code...} Here I also used query_posts to specify my own category, but the classification is still unrealistic. I want to get the category of the current article in The post type customized by wordpress. Classification is

OC tutorial 3-category extension ProtocolOC3-language features This chapter mainly describes the OC language features. Category) Extension) Protocol 1, categoryThe category mechanism in the OC language has only one function: Adding Methods to any classNow we create a Student class@interface Student : NSObject@property(nonatomic,strong)NSString * name;@end@imp