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_protocol is a set of interfaces that are declared to have all the methods in the protocol after a protocol has been complied with. The NSObject class complies with the NSObject protocol and implements all the methods in the NSObject protocol, so the NSObject class and its subclasses can call these methods. This paper mainly introduces the meth ...

Recently, when communicating with people, a question was raised that attributes could not be added to iOS classifications. Here we discuss the reasons why we can't add it and the ways to add it. First, create a person class with the following code: XGPerson.h #import <Foundation/Foundation.h> @interface XGPerson : NSObject /// Age @pro ...

1. Property name 1 > NSFontAttributeName (font) The value corresponding to this property is a UIFont object. This property is used to change the font of a paragraph of text. If this property is not specified, the default is 12-point Helvetica(Neue).2 > NSParagraph Style Attribute Name (paragraph) The value corresponding to this property ...

  Detailed XCTest for iOS unit testing   Preface: test Is an integral part of a good App.Each App is a small set of features.And these small functions are a function or a function algorithm Grouped together.Unit testing is about testing these small functions or functions, and good unit testing can make your code much more rob ...

brief introduction UITabBarController - tab controllers, like navigation controllers, are also widely used in various ios applications. As the name implies, the tab controller displays a series of "pick-up cards" at the bottom of the screen, which are represented as icons and text, and the user touches them to switch between different ...

In iOS development, the data of pages is not acquired through an interface. Sometimes it is necessary to acquire data from multiple interfaces of servers, and then update the pages. Sometimes it is necessary to acquire data from one interface and then acquire data from other interfaces. The source framework AFNetWorking is a powerful third-pa ...

The concept of singletons A singleton class ensures that there is only one instance object of that class in the application's life cycle and that it is accessible from the outside world.There are many singleton classes in iOS, such as UIApplication,UIScreen,NSNotificationCenter,NSFileManager,NSUserDefaults,NSURLCache,NSHTTPCookieStorage, and ...

meta-basic knowledge H5 page window automatically adjusts to device width and prohibits users from scaling pages <meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no" /> Ignore identifying numbers on pages as phone numbers <meta name="format-detection" conten ...

1. Property name 1> NSFontAttributeName (Font) The value corresponding to this property is a UIFont object.This property is used to change the font of a piece of text.If this property is not specified, it defaults to 12-point Helvetica(Neue). 2> NSParagraph StyleAttributeName (Paragraph) The value corresponding to this property is a N ...

In the development of iOS, sometimes it is necessary to set blurred pictures to achieve better user experience for specific effects. After iOS7, translucent blurring effect has been widely used. Now it can be seen that many applications use image blurring effect locally, and can achieve image blurring effect through Gauss blurring and ground ...