Objective-C

OBJECTIVE-C does not directly provide random data generation functions or methods, but we can directly use C's various random algorithmsThe following is the use of several common random number algorithms, which can be referenced in the following

Nsmutablearray *sourcearray = [Nsmutablearray arraywithobjects:@ (3), @ (5), @ (7), @ (9), @ (2), @ (4), @ (8), @ (6), nil];Select sortfor (int i = 0; i {for (int j = i+1; J {Nsinteger baseidx = i;Nsinteger moveidx = j;nsnumber* basenum =

Singleton is a class that can only instantiate an object. Although this is a practical definition of a singleton, it is not necessarily the case in the foundation framework. Like whatNsfilemangerAndNsnotificationcenter,By their class method,

Type-member Type MemberMembers of struct structs are simple, only variables.There are many members of the class:Data member Description Object ( The focus of this lecture )· Instance variable instance variable· Attribute PropertyFunctions member

Recently in the data-type app needs a good resource management tools, Excel in this respect is very good, but can first very low, the second data volume a large query is a problem.So I used Django to do a resource management gadget. The benefits are

The protocol in Objective-c, equivalent to the interface in JavaReference: http://www.cnblogs.com/zzy0471/p/3894307.htmlA simple protocol to follow:PersonProtocol.h@protocol Agreement name @requiredMethods that must be implemented@optionalOptional

Predicate: nspredicate1, Overview:Used to set the condition of the specified filter, the popular understanding is to set the conditions of the selection, and then apply the condition to the specified object2, Usage:A, set the predicate

SELIn Objective-c, the SEL is a type of selector (selector). A selector is a pointer to a method, and the reader can simply understand that running the program here will execute the specified method, so you can define a selector: SEL action

Uiimageview+faceawarefillThis category uses the Aspect fill content mode, which can be automatically adjusted to the image content, and when the face is detected, it replaces the center of the image with the center of the face. Test environment:

1.Foundation FrameReference a pictureCocoa can be seen as a collection of many frameworks, including the foundation framework and the Uikit framework in iOS, where the foundation framework is primarily API-ready for program development, and Uikit

Objective-c delegation and protocol this has no relationship, the agreement as mentioned above, is to play the role of pure virtual class in C + +, for the "delegation" is not related to the agreement, but we often use the Protocol also implement

Simple use of 0.NSString1. Class encapsulation, data protection;2.setter and Getter methods;3.self,supper,id4. Initialization method;5. Class methods=========================================================0, NSString Simple useNSString is the OC

Objective-C categories (category)1. When you want to add methods to a class, you usually expand (extend, that is, inherit) it. However, this is not necessarily a perfect solution, especially if you want to rewrite a class A feature, but you do not

Before learning the intricacies of a new programming language it is often worth taking a little time to learn about the history and legacy of that language. In this chapter ofobjective-C2.0 essentials we will provide a brief overview of the origins

This article has a delete section: Integer Data (INT) In objective-C, the int type can store positive or negative integers (I .e. no decimal places). The number of INTEGER (INT) digits depends on the target machine, which is determined during the

Reprinted from: http://blog.eddie.com.tw/2010/12/11/protocol-in-objective-c/ We have mentioned the implicit commitment of OOP, but unlike C ++, objective-C does not have the same objective, if you want to achieve the ability of multiple types in a

In objective-C, @ property, @ synthesize, and point syntax are related to two functions. One is the setter function, and the other is the getter function. In the past, we used to define the setter and getter functions. @interface Dog:NSObject{int

Polymorphism in C ++ (two types ): Compile-time matching: function overload. Different function call matching is implemented based on the name, type, and number of member functions; Runtime matching: virtual functions, specifically by declaring the

1. Chapter 1 Departure In addition to the objective-C language, this book also introduces Apple's toolkit cocoa (for OS X systems) and cocoa touch (for iOS systems ). They are all written in objective-C language, which contains all the user

Chapter 2: learn more about xcodeXcode is a useful tool with many powerful functions, but not all functions are easy to find. If you plan to use this powerful tool for a long time, you must know it as much as possible. This chapter describes how to