Objective-C

Arithmetic functions Arithmetic functions] Function Name Description Int rand () Random Number Generation.(Example)Srand (Time (NiL); // initial Random NumberInt val = rand () % 50; // 0 ~ Random Number

1. If you want to create an instance using "-", use "+" as the class method ". 2. Select a return type and enclose it in parentheses. (Void) indicates that no return value is returned. (bool) indicates that a Boolean value is returned. (Nsobject *)

Video tutorial for iPhone development-objective-C language tutorial-1st-basic syntaxVideo tutorial for iPhone development-objective-C language tutorial-2nd-point syntaxIPhone development video tutorial-objective-C language tutorial-lecture

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

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

On the InternetArticleMany of them planned to have a fun game two days ago. As a result, the black apple test failed. The main reason is that the configuration is not enough. The memory must have at least 4 GB to barely OK ...... I bought Acer 4726

Cocoa memory management method:Retain, releaseAndAutorelease Summary: Each object maintains a reserved counter. when an object is created, its reserved counter value is 1. When the object is retained, the counter is + 1. When the object is

I. nsarray Nsarray is a class of cocoa used to storeObject. Restrictions:1. Only objects in object-C can be stored, and basic data types in C language cannot be stored, such as random pointers in int, float, Enum, struct, or nsarray; 2. Nil

Example of method definition: -(Void) insertobject :( ID) anobject atindex :( nsinteger) Index Explanations: 1. Method Modifier -This method is an entity method. It must be a class instance and can be called only through an instance. +

In C #, we use interfaces to implement polymorphism. For example, the interface iob defines a method F. There are two classes A and B that implement the IOB interface. Iob item = new (); Item. F (); // The execution is a.f (); Item = new B ();

Today, we can see Enum and typedef. Two examples are shown in the two sections: Enum direction {north, south, east, west }; Typedef Enum {north, south, east, west} direction; I can't help wondering what are the differences between the two. I

1. In fact, the inheritance in OC is basically the same as that in C #. They all add the: and parent class name when defining the class, that is, myclass: parentclass. 2. Only single inheritance is allowed. 3. It is a bit strange to use attributes.

(For passing values between viewcontrollers) the simplest and most professional method is the so-called shared instance ). The basic practice is to create a singleton class method that can instantiate this class at the first call, and then return

Use nsenumertor to traverse array elements CodeAs follows: Nsarray * array = [nsarray arraywithobjects: @ "one", @ "two", @ "three", nil]; Nsenumerator * enumerator; Enumerator = [array objectenumerator]; ID thing; While (thing = [enumerator

From: http://blog.csdn.net/diyagoanyhacker/archive/2011/05/30/6455244.aspx Write Program It is not terrible to encounter bugs. Most problems are solved through simple log or Code The analysis is not difficult to find the cause. However, when the

I accidentally applied for an iPhone development role some time ago. I was asked about the similarities and differences between objc and C ++. I always expressed my preference for C ++. I wrote a bit in two languagesCodeI think I can write some text

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

Category allows you to extend the functions of a class even without the class source code and add methods to it. ** This can be understood as a mechanism of "Mixin. The main function is to reuse the same method in a class without inheritance.

To create an object, follow these steps:1. dynamically allocate memory for new objects.2. Associate the newly allocated memory with related values. After both steps are completed, the object creation process is complete. Although two steps are

From: http://blog.prosight.me/index.php/2010/11/670 UUID is a 128-bit value, which guarantees uniqueness. Generally, it is generated by the MAC address of the machine's Nic and the current system time. UUID is a string connected by a hyphen.