Objective-C

Manage memory manually The retain count is a fairly simple concept in which an object in Objective-c has a retain count. The retain count is an integer. When you use the Alloc function to create an object, the retain count for that object is set to

Original address: Java long time and objective-c time conversion The problem of one-month-long Java time and objective-c time conversion problems have finally solved, I did not think so simple Java time/1000 is objective-c time. Expand the NSDate [

We know that OC can be mixed programming with C, and similarly, the string of C and the string of OC are very similar. In some cases, mutual conversion is required. Now let's make this happen: #import int main (int argc, const char * argv[]) {

first, the support of nullability detection 1. IntroductionIn the previous OC, the development often encountered because a method should return an instance object and actually returned empty caused the application to crash, and Nullability's

Let's assume that we've created a class today. We are named MyObject and inherit from NSObject.Inheritance know, it is you this subclass (MyObject) assumes that nothing is written, and the parent class (NSObject) is exactly the same. Almost all of

Directly on the code: / * * Quick Enumeration * */ NSLog( @"++++++++++++++++++") ;Nsarray*testarray = @[@1, @2, @3, @4, @5] ;//Iterate over array elements by Quick enumeration for(Nsarray*object in Testarray) {NSLog( @"%@",

In the previous article, we introduced the runtime is what, is a theoretical introduction, you read the last article is very urgent to know what the runtime is capable of? Don't worry, this blog is going to explain how the runtime is applied to the

Reprint, quote Please specify the source!Class of Objective-cI. Introduction to grammar 1, Class 1),. hFiles: Classes ofStatementFile that declares instance variables and methods. The declaration of the class uses the keyword@interfaceAnd@end。 The

Summary: nil is used to assign values to objects (any object of object-c is of type ID), NULL assigns any pointer, null and nil are not interchangeable, nil is used for class pointer assignment (in OBJECT-C class is an object, is an instance of

There is one of the same two different. Same written by Mattt Thompson on Dec 10th, 2012Objective-c is a rapidly evolving language, in a-a-to-a-you-just-t see in established programming languages. ARC, Object literals, subscripting, blocks:in the

block (OC data type, very common, essentially C struct)Similar to inline functions, from the source code layer, there is the structure of the function, but after compiling, but does not have the nature of the function. At compile time, similar to

directory of this document First, what is a null pointer and a wild pointer Two examples of wild pointers and null pointers Description: This objective-c topic is a prelude to learning iOS development, and to enable programmers

OBJECTIVE-C IntroductionUsually writing OBJC and less used objective C or OBJ-C, is an object-oriented programming language that expands C. It is mainly used in Mac OS X and GNUstep, which use the OpenStep standard system, and it is the basic

write in frontIt took some time in recent days to get to know something about the OBJECTIVE-C runtime, which involved the +load approach, such as method swizzling, which is usually done in the +load method of the category. Before the use of

Let's take a look at the main definitions of NSObject as follows (including some of my understanding comments):@interface nsobject {Class isa objc_isa_availability;} /* Initializing a class *//** * @author arbboter, 15-01-15 22:01:47 * * If the

1. nsnumber:Nsarray and nsdictionary do not allow basic data typesNsnumber can encapsulate basic data types into objects, so that the basic data types can be indirectly put into nsarray and nsdictionary. 2. nsvalue:Nsnumber is a subclass of

In objective-C, how do I define a class? We can use the following format for representation: @ Interface Class Name: parent class name {variable definition;} method definition; @ end; An example is provided below: @ Interface

  Through the hello World Program on the front, we know how to include the header file and the basic usage of nslog. Starting from this section, we will explain how to declare and define classes through a simple class, and the length of member

What about the first iPhone application in objective-C syntax? If the original Yusong Momo article is reprinted, please note: It is reprinted to my independent domain name blogYusong Momo program Research Institute, Original address:

The premise of this article is to understand Java or other languages. Because C has too much knowledge to complete, it is just a difference between Java and Java. I am planning to write about iOS development recently. iOS development is inseparable