thinkful isa

analysis on the implementation mechanism of iphone program development KVO/KVCIPhoneThe realization mechanism analysis of the program development KVO/KVC is the content that this article introduces, does not say much, directly enters the topic. Let's look at the details. objective-c inside the Key-value observing (KVO) mechanism, very good, can be very good to reduce the watering code. About KVO study, you can refer to the article: "Key-value observing Quick Start": http://www.cocoadev.cn/Object

corresponding change in a property in B (view Class). For the cocoa of MVC, KVO application is of high value.Key-value Coding (KVC) Implementation analysisKVC used a isa-swizzling technique. Isa-swizzling is the type-mixed pointer mechanism. KVC mainly through the isa-swizzling, to achieve its internal search and positioning. The

the method;3. Be sure not to use local in the method unless you really want to pass the variable to the other subroutine;4. Be sure not to use global variables in class modules.V. MethodsThe Perl class method is simply a Perl subroutine, also known as a member function. The Perl method definition does not provide any special syntax, but specifies that the first parameter of the method is the object or its referenced package. Perl has two methods, static methods and virtual methods.The first par

Nsobject analysis (unfinished) Reprinted please note source http://blog.csdn.net/uxyheaven The nsobject class in IOS is not open-source, but Runtime is open-source. There is an object-like interface which is similar to nsobject. Next I will analyze nsobject through the object code. The runtime code is available at http://opensource.apple.com/tarballs/objc4/objc4-493.9.tar.gz. the objectfile is in the Attribute Isa Is a pointer to the class. For detail

In the previous article "go deep into Cocoa and other objects", I have introduced in detail The concept of Class and Object. How can we run it today? Hour Dynamically create a class. The following function applies the Class and MetaClass concepts mentioned above to dynamically create a Class at runtime. This function comes from InsideMac OS X-The Objective-C Programming Language.# Import # Import BOOL CreateClassDefinition (const char * name, const char * superclassName){Struct objc_class * met

14:14:58Author: Yang Dengfeng (dengfengyang@gmail.com) Time: 2010-03-12 Post please indicate to transfer Apple development Chinese Network (http://www.cocoadev.cn/Objective-C/KVO-20100222-0627.asp) The preceding description is an integral part of this document. The key-value observing (KVO) mechanism in objective-C is very good and can reduce the watering code. On the KVO learning, you can refer to the article: Key-value observing Quick Start: http://www.cocoadev.cn/Objective-C/Key-Value-Observi

Recently, I plan to write something that is relatively low-level in objc, especially related to runtime. Apple has made the objc runtime code open source, we can from: http://opensource.apple.com/source/objc4/objc4-493.9/runtime/browse the source code, or click here to download the source code. Where can I start? That is of course the most basic class and object. Compared with C ++, the class and Object Structures in objc are much more concise and consistent (refer to "Deep Exploration C ++ obje

){ Return No;} // Find the root class because the ISA of the Meta class points to the Meta class of the root class. Root_class = super_class; While (Root_class-> super_class! = Nil){Root_class = root_class-> super_class;} // Allocate memory for the class and its Meta class New_class = calloc ( 2 , Sizeof ( Struct Objc_class ));Meta_class = new_class [ 1 ]; // Set class New_class-> ISA = meta_class;

NSObject Class Analysis (unfinished), nsobject unfinishedNSObject analysis (unfinished) Reprinted please note source http://blog.csdn.net/uxyheaven The NSObject class in iOS is not open-source, but runtime is open-source. There is an Object-like interface which is similar to NSObject. Next I will analyze NSObject through the Object code. The runtime code is available at http://opensource.apple.com/tarballs/objc4/objc4-493.9.tar.gz. the objectfile is in the Attribute

IOS-talking about runtime mechanism 01-class and object internal structure, ios-01- I have been studying the mechanism of runtime recently. I think there may be many people who are not quite clear about this problem, right? I will share with you my understanding of the runtime mechanism. To understand runtime, first we need to understand the internal structure of classes and objects. Next we will first introduce the structural layers of classes and objects in OC.1. First, find the definition of

IPhoneProgram DevelopmentKVO/KVCImplementation Mechanism analysis is the content to be introduced in this article. Let's take a look at the details. Key-Value Observing (KVO) Mechanism, very good, can reduce the watering code. AboutKVOLearning, you can refer to the article: "Key-Value Observing Quick Start": http://www.cocoadev.cn/Objective-C/Key-Value-Observing-Quick-Start-cn.asp Key-Value CodingKVC) Implementation Analysis KVCIt uses an isa-swizzlin

# Yum install lm_sensors # Sensors-dectect Startup failure discovered mainly because kernel module coretemp is needed # Modprobe coretemp # Uname- Linux 2.6.18-194.3.1.el5 #1 SMP Thu May 13 13:08:30 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux Find the kernel version number. This module was built into 2.6.22. Google finds an available Module Wget http://www.cs.vsu.ru /~ Raskhozev/files/dkms-coretemp-1.00-1.noarch.rpm Download and install it. [Root @ server Neil] # modinfo coretempBash: modin

We can find the definition of class and object in/usr/include/objc/objc.h and runtime.h: typedef struct OBJC_CLASS *class; typedef struct OBJC_OBJECT { Class Isa; } *id; Class is a pointer to a objc_class struct type, and an ID (any object) is a pointer to a objc_object struct type whose first member is a pointer to a objc_class struct type. Note that there is a key explanation: the memory layout with a objc_class pointer for all the things that

Objective-C object model and runtime MechanismContent list object model (structure definition, Class Object, Meta class and instance object relationship) message transmission and forwarding mechanism runtime system function understanding Object Model Structure Definition Object ):The basic building block (OC) is used to store and transmit data. You can find the definition of the object structure in the objc. h file. The object structure is isa of the

Reprinted from: http://www.cppblog.com/kesalin/archive/2012/01/19/objc_class_object.html Recently, I plan to write something that is relatively low-level in objc, especially related to runtime. Apple has made the objc runtime code open-source, we can browse the source code from: http://opensource.apple.com/source/objc4/objc4-493.9/runtime/, or click here to download the source code. Where can I start? That is of course the most basic class and object. Compared with C ++, the class and Object Str

IPhoneProgram DevelopmentKVO/KVCImplementation Mechanism analysis is the content to be introduced in this article. Let's take a look at the details. Key-value observing (KVO) Mechanism, very good, can reduce the watering code. AboutKVOLearning, you can refer to the article: "key-value observing Quick Start": http://www.cocoadev.cn/Objective-C/Key-Value-Observing-Quick-Start-cn.asp Key-value coding (KVC) Implementation Analysis KVCIt uses an ISA-swizzl

IOS development: Cocoa-Explanation of classes and objects We can find the definition of class and object in/usr/include/objc. h and runtime. h: typedef struct objc_class *Class;typedef struct objc_object { Class isa;} *id; Class is a pointer of the objc_class structure type, and id (any object) is a pointer of the objc_object structure type. Its first member is a pointer of the objc_class structure type. Note that there is a key extended explanatio

The nature of the class: The nature of a class is actually an object (class object), and as long as you have a class object, you can create an instance object from the class object in the future. The first time the class is used in the program, it is created and only one copy of the entire program. Each subsequent use is this class object, which persists while the program is running. A class object is a data structure that stores basic information about a class: The class size,

experts from around the world. udemy-Learn the real world skills. Learn how to Program codecademy-free, interactive learning program. stuk.io-Learn how to program from the beginning. Udacity-win the approval of industry leaders. platzi-courses on the design, marketing and programming of live classes. Learnable-the best way to learn web development. Code school-is programmed through practicing learning. THINKFUL-1 1 Coaching to boost your career. code

Memory mapping is one of the most interesting features of modern Unix systems. As for drivers, memory mappings can be implemented to provide direct access to device memory by user programs. A clear example of a mmap usage can be seen from a subset of the virtual memory areas that are viewed to the X Windows system server: Cat/proc/731/maps 000a0000-000c0000 rwxs 000a0000 03:01 282652/dev/mem 000f0000-00100000 r-xs 000f0000 03:01 282652/dev/mem 00400000-005c0000 R-xp 00000000 03:01 1366927/usr/x