Objective-C

Default Dynamic Behavior:The object is dynamically typed.The memory is allocated only at run time.A message is dynamically bound, and an object can only execute the message it understands as a "method call". Although dynamic execution

Use@ Synchronized () indicates a synchronous method. The method for implementing synchronization is different from other language types by using a mutex lock. The locked object determines the size of the lock range. For example, the locked instance

IPhone development entry-level code: Objective-C coding specifications (1) IPhone development entry-level code: Objective-C coding specifications (2) IPhone development entry-level code: Objective-C coding specifications (3) IPhone development

# Import Int Main ( Int Argc, Char * Argv []) { If (Argc = 1 ) {Nslog ( @" You need to provide a file name " ); Return 1 ;} File * File = fopen (argv [ 1 ], " R " ); Char Words [ 100 ]; While (Fgets (words, 100 , File) {words

1 category Classification provides a way to extend the class definition. Classification can access the instance variables of the original class. Pay attention to the following points when using classification: 1.1 you cannot add any variables of

After that, the hacker became familiar with the platform class library ghost and studied the frequently-used event processing metrics controls. Then he could develop the app. 1. # Import# Import # Import "successfully created successfully named"In

Nil can only be applied in the ID type, that is, the pointer to the object in Java and C ++. Null is used as a non-object pointer. See the following example:  -(Void)Observevalueforkeypath Nsstring *)Keypath ofobject ID)Object

1. the header file is still. h2. cpp is changed to. M.3. # import replaces # include, # import is guaranteed to be referenced only once, which is equivalent to # ifndef # define # endif mode in. h.4. Use @ interface... @ End to declare the class and

Since xcode 4.2, objective-C supports arc, which is a great boon for the majority of ipone developers. You don't have to face the ugly scenes like full screen [OBJ release] and [pool drain ].CodeMore importantly, you don't have to worry about the

Share the code for implementing the singleton mode in objective-C.   It seems that the design pattern is rarely mentioned in MAC development... At least we haven't seen any design patterns implemented with objective-c...   Code Code

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I want to call C ++'sCodeHere, I will summarize my methods,The Hello class is only an encapsulation of Calling C ++ for objective-C.. However, I feel that this is too inconvenient. If there are a lot of C ++ code, it will be very difficult to do

In object-C, selector has two meanings: In the source file, it points to a method call, and after compilation it points to an unque indentifier. The type of the compiled selector is Sel, And the selector of the same name is the same. Using

Syntax used for quick enumeration:For (type newvariable in expression) {statements}OrType existingitem;For (existingitem in expression) {statements} Objects cannot be changed during enumeration. Use the following three classes for quick

In the previous chapter, we talked about the extension of class methods. The reference is to add another instance variable (usually a static variable) to the existing class ), this function is only available after IOS and OS X v10.6. The reason

Class Definition: Although the compiler is not mandatory, the type of interface declaration and implementationCodeIt is best to put them in two different files for developers who use these classes to view them easily. The implemented file

The content of this series corresponds to the content described in the official objective-C language, which is divided into the following parts: Object, type, message Define a class Allocate and initialize memory for objects

  Nsarray _ sectiondatastr; _ sectiondatastr = [[nsarray alloc] region: [nsarray region: @ "Item1", @ "item2", nil], [nsarray arraywithobjects: @ "Item1 ", @ "item2", @ "item3", nil], [nsarray arraywithobjects: @ "Item1", @ "item2", @ "item3", @

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

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