Objective-C

I have read Apple's official document, "Advanced Memory Management Programming," and have never understood why the accessor method cannot be used in the Init and Dealloc methods. His usual work in practice, seemingly did not find any problems. Until

ARC (is compiler feature) ARC is a new feature that has been added since iOS 5, completely eliminating the cumbersome manual management of memory, and the compiler will automatically insert the appropriate retain, release, and autorelease

Nsinteger is not an object, converted to a long match 64-bit system, and then composed of a string (%LD).NSString *inStr = [NSString stringWithFormat: @"%ld", (long)month];Note that on 64-bit processors, such as the new A7 chip, if your app was

Artifice refers to a skill and a product that is too kit and useless.Reprint please specify the source http://blog.csdn.net/uxyheaven/article/details/46789065As we all know, in general, we are not able to add attributes to the category.If you want

Advantages:Defensive programming can detect errors early in development.Example code:The following is the implementation code for the associated access method.- （void) Settire: (Tire *) Tire Atindex: (int)Index{if(Index0||Index>3) {NSLog (@"Bad

Block is an OC extension to ANSI C, using blocks to better simplify OC programming, and many of OC's APIs are dependent on blocks.First, block(a), block of the use of the methodThe syntax format is as follows:^ [block return value type] (parameter 1,

In objective-C 2.0, there are two ways to extend the implementation of existing classes without using class inheritance. One is classification, and the other is class extensions ). The former can extend the implementation of classes without the

Objective-C looks like a C language or is related to a C language. It is true that objective-C is a superset of C language. It extends the C language and adds object-oriented support based on the C language, added its own unique features. Therefore,

After using @ interface to declare a class, you can use @ implementation to implement the class. The syntax for class implementation is as follows: @ Implementation class name method implementationCode; @ End; Instance: @ Implementation

Author: failingProgramMember-eight gods C # demonstrates the features and functions of multiple languages. The following describes the extension methods introduced from objective-C. The following example demonstrates an extension method defined

Object-C provides a Java/C ++-style error handling model. When the-fobjc-exceptions switch (GCC> 3.3) is used, it can work, however, this feature is only available in Versions later than OS X v10.3. The principle of using error capture is similar

Shortest copy A shallow copy is a copy of the memory address, so that the target object pointer and source object point to the same memory space. For example: char* str = (char*)malloc(100); char* str2 = str; The light copy is only a simple copy

I have been dealing with object-oriented objects for some time. At that time, I learned OOP through C ++, and later I came into contact with PHP and Java. Every OOP language is more or less different in Object-Oriented aspects. Now I am learning the

Discussing a strange concept of objective-C: meta-class Every class in objective-C has its own meta-class, but it is mysterious because you seldom use meta-class directly. Create a class at runtime The following code creates a new nserror subclass

Nonatomic: Non-atomic access, no lock when assigning values to attributes, multi-thread concurrent access will improve performance. If this attribute is not added, both access methods are atomic transaction access by default. (Atomic is a thread

1. Nil A null pointer pointing to an objective-C object RepresentsObjectNull: nsstring * STR = nil; (# define nil (ID) 0 )) 2. Nil A null pointer pointing to an objective-C Class Object. RepresentsClassObjectNull: Class class = nil; 3. null The

Objective-C beginner's Guide (version 2nd)Basic InformationOriginal Title: Objective-C for absolute beginners: iPhone, iPad, and Mac programming made easy, Second EditionAuthor: (US) bernett (Bennett, G.) (US) Fisher (Fisher, M.) (US) lies (Lees, B.)

Objective-c for Java programmer Part 1Java is mostly inspired by Objective-C, but many people find it difficult to learn Objective-C after learning Java. In the first two-part ChisnallCocoa programming development manual, Author DavidThis paper

Outline: Introduction Notes compared with the C Language Objective-c advanced features Development Tool introduction (cocoa toolkit features, framework, source file organization; XCode usage Introduction) Introduction: 1. objective-c is an extension

In my OS x programming of late, one debugging technique I thought wocould be handy is the ability log and trace Objective-C messages sent. it turns out this is not only possible, but quite easy. however my journey to this easy answer was quite long