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

Objective-c Simple encapsulation String storage operation, eliminates the middle sandbox processing way Copy Code code as follows: /Storage PublicKey and SessionID-writecontent:nil-only fetch data, others-modify the original content and

No matter how perfect a class design is, it inevitably encounters an unpredictable demand, so how do you extend existing classes? Of course, inheritance is a good choice. But Objective-c provides a special way to extend the class, called catagory,

An analysis of KVO examples Recently encountered a problem, in the process of a comment interface in the project, because the direct use of the UIWebView to display a list of comments, the results of the page up and down there is a cgsize (320,65)

turn from: http://blog.jobbole.com/45963/ In the past few years, a lot of objective-c developers have emerged. Some are turned from dynamic languages, such as Ruby or Python, and some are transferred from a strongly typed language, such as Java or

Common version numbers such as2.0.1 compared to 2.0.2, 2.0.2 is newer than 2.0.1.So how to compare this version numberHere is a relatively simple implementation of the scheme2.0.1 This format can be split into multiple partsIf the 2 here is the big

UIWebView is one of the most commonly used SDKs for iOS, and it has a stringbyevaluatingjavascriptfromstring method to embed JavaScript in the page, In this way we can interact with the page elements in UIWebView in

Decorating mode is the ability to dynamically extend an object without having to change the original class file and use inheritance. It is by creating a wrapper object, that is, decorating to wrap the real object.For example, the game console has a

Original URL: http://blog.csdn.net/totogo2010/article/details/8198694Introduced:Third-party libraries are indispensable when developing applications and can improve the efficiency of development. Some frequently used libraries, in the new project

Description: This objective-c topic is a prelude to learning iOS development, and to enable programmers with experience in object-oriented language development to quickly get started with objective-c. If you do not have programming experience, or

How does I Declare A Block in objective-c? As alocal variable:returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};As a Property:@property (nonatomic, copy, nullability) returnType (^blockName)(parameterTypes);As amethod Parameter:

. h header file, which declares some public properties, methods. Header files generally do not put too much stuff, there is no need to expose too many interfaces, private and encapsulation.. m master file, used to implement methods in. h files, and

Use Ns_enum and Ns_options macros to define enumerations. Adopting modern Objective-cUse the Ns_enum macro to define a set of mutually exclusive enumeration values:typedef ns_enum (Nsinteger, Uitableviewcellstyle) {

Benefits of Encapsulation: Filter for unreasonable values The assignment process inside the Shield Let the outside world not pay attention to the internal details Benefits of Inheritance: Do not change the original

OC is an extension of the C language, and almost all applications on OS X or iOS platforms are developed in that language. You can use the Toolkit cocoa (OS X System) and Cocoa Touch (for iOS systems) to develop fully functional objective-c

1th Chapter Departure Http://www.cnblogs.com/duxiuxing/p/5492219.html The 2nd chapter on the expansion of C3rd. Basic knowledge of object-oriented programming4th Chapter Succession5th Chapter Composite6th Chapter Source Document

Let's talk about what we'll mention in this article: ##,__va_args__, __file__, __line__, __function__, etc.Macro variables:To give an example, you'll use these macros: #define myprintf (...) printk ("[Lch]:file:%s, line:%d, function:%s," \

First of all, the role of their two, nil is to put an object's pointer to empty, just cut off the pointer and in-memory objects, it does not have any effect on the release of memory, and release is really used for memory release, after release, the

I. Description The turntable is composed of four parts, the chassis, rotating disk, turntable hands, Start button, all affixed to the Self.view, another 12 show the winning level of uilabel affixed to the rotating disc,  Animations are implemented

Now we will use objective-C to define an actual class and learn how to use the class instance. Similarly, we will first learn the process. Therefore, the actual program examples may not be particularly practical, and more practical content will be