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Tag: objective-c

ios

How is KVC implemented

December 11, 2023
by Kismat Kant
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Well, the test worked, after all, it was just a simple KVC operation. - (void)setValue:(nullable id)value forKey:(NSString *)key; Method is more powerful. It assigns values...
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ios

[iOS features]- Summary

December 11, 2023
by James Moore
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Cocoa Pods ERROR: While Executing gem... (Errno::EPERM) 13. SDWebImage Local cache sometimes causes harm. If you have cached an image before, even if the server...
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ios

Simple Runtime (3) : message mechanism

December 11, 2023
by Hilary Reed
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When a method is called in OC, the compiler calls one of the following functions for message passing, depending on the situation: Objc_msgSend, objc_msgSend_stret, objc_msgSendSuper,...
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ios

Objective-c (10) Category

December 11, 2023
by Christina Webb-Murphy
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This article, the 10th in the Objective-C series, covers the implementation principles and features of categories. Category is a language feature added after Objective-C 2.0....
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ios

Memory management for child threads

December 11, 2023
by 羅雅萍
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We all know that objects created by methods that start with alloc, new, copy, and mutableCopy will be released where appropriate, while other methods named...
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ios

Custom KVO

December 11, 2023
by Lindsay Smith
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KVO is introduced in front of the system KVO implementation of the general logic, divided into the following steps 1. Create a subclass and point...
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ios

What about dispatch_once

December 11, 2023
by Neil Evans
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Speaking of singletons, it's easy to think of using dispatch_once to build a singleton object in Objective-C, but recently we stumbled into the Dispatch_once trap...
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ios

Objc_alloc allocates object space

December 10, 2023
by Kathryn Collins
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IOS uses the runtime memory allocator _objc_rootAllocWithZone by default. However, the system also leaves open the possibility for the programmer to implement a personalized memory...
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ios

I’ll take pictures for you

December 10, 2023
by Jeremy Ward
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Have you ever seen a layout where you have a fixed size image in the front, a nickname of varying length in the middle, a...
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ios

The iOS Runtime mechanism (objC4)

December 10, 2023
by Patricia Parsons
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Runtime is the deferment of data type determination from compile time to Runtime. It's a set of underlying pure C apis, and all the objective-C...
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ios

Finish the Runloop article

December 10, 2023
by Ms. Holly Steele
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Runloop is a basic component that is tied to threads and is behind many of the thread-related functionality. Runloop is what it sounds like. It's...
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ios

Xcode 12 Problem records

December 10, 2023
by Cassandra Gallagher
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1 The POD error occurs on the terminal. To solve the problem, run xcode-select--install on the terminal and restart the terminal. 2 The solution is...
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ios

Static library principle

December 10, 2023
by Chelsea Heath
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The most common library file formats in iOS are.a.dylib.framework. Xcframework. Today we will explore.a files, also known as static libraries. First of all, let's look...
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ios

Start with objc_init

December 10, 2023
by Anya Ratti
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The characteristics of the static library is in the link stage, will be the target program and reference library packaged together to the executable file,...
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ios

iOS – Runtime Method Swizzling

December 10, 2023
by 張承翰
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What is a Method Swizzling which is usually what we call Method swapping or Method spoofing Method Swizzling to change an existing selector implementation while...
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ios

Nil, nil, NULL, NSNull, kCFNull

December 10, 2023
by 余佳蓉
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Nil nil, NULL, NSNull, kCFNull nilObjective - the difference between a C instance object pointer NULL: NSSring * STR = nil; Nil: Classclass=Nil; NULLC
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ios

Classification of the Category

December 10, 2023
by Keith Mason
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In OC, we can use categories to add methods, attributes to classes. You can also override the existing methods of a class and add new...
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ios

multithreading

December 10, 2023
by William Gray
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IOS multithreading 1. How many iOS multithreading schemes? NSOperation (based on GCD) you can add task-dependent control. IsReady whether a task isReady. IsExecuting whether a...
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