Objective-C

This paper briefly introduces several common methods of generating random numbers in objective-c, and shares them with us, hoping to bring some reference value to everyone. Specifically as follows: 1), Arc4random () method : More accurate does not

Common methods of NSNumber Why use a numeric object NSNumber when you have a data type for int in objective-c? This is because many classes, such as Nsarray, require the use of objects, and int is not an object.NSNumber is a digital object we can

Now, a good iOS app is sometimes associated with web content, and of course it also adds to the user experience, and it's better and more effective at showing the app's functionality. Because I will use this part of the project in the function,

Empty stringin iOS applications, if you request data from the network, return JSON or XML format data, often encounter empty string, the general interface is written in Java and other languages, if it is Android, because the source language is Java,

In this paper, the definition and usage of the structural body nsrange,nspoint,nssize (cgsize) and Nsrect in Objective-c are described in detail, as follows: 1, Nsrange: Nsrange's prototype is typedef struct _NSRANGE { nsuinteger location;

In objective-c, sending messages to nil is not crash. The reason is that when the execution ID objc_msgsend (id self, SEL op, ...) method, if self = nil, the function does not perform any meaningful action and returns directly. The return value

1, NSString converted into nsdate NSString *datestr = "2013-6-3 14:58:00"; NSDateFormatter *format=[[nsdateformatter alloc] init]; [Format setdateformat:@ "Yyyy-mm-dd HH:mm:ss"]; NSDate *date=[format DATEFROMSTRING:DATESTR];

The following example is encountered when studying: #import @interface retaintracker:nsobject @end//Retaintracker @implementation Retain Tracker-(ID) init {if (self = [super init]) {NSLog (@ ' init:retain count of%d. ", [self retaincount]); }

Original Http://tutuge.me/2015/03/21/effective-objective-c-5-enum/?utm_source=tuicool&utm_medium=referral PrefaceEnums, which are enumerations, start with the C language, C + +, Java, objective-c, Swift, all of which have corresponding enumeration

Appearance mode (facade), which provides a consistent interface for a set of interfaces in a subsystem, defines a high-level interface that makes this subsystem easier to use.You can consider using the appearance mode in the following cases: (1) The

CategoryOC provides a different way of adding new behaviors (methods) to existing classes dynamically.This ensures that the original design of the class is small and gradually expands as the function increases.And when you use the category to extend

Simple Zoo System implementation#import#import "Animal.h"//Zoo@interfaceZoo:nsobject@property (nonatomic, strong) Animal*animal;//Animal@property (nonatomic, assign)intFoodsave;//Food Storage/** * Initialize Method The quantity of food passed in the

Two classes are provided in objective-c to implement dictionaries, namely nsdictionary and nsmutabledictionary. Among them, Nsmutabledictionary is a subclass of Nsdictionary, which inherits the parent class method while supporting the insertion and

Objective-C: created by Brad Cox in S, it integrates the portability, high performance, and object-oriented capabilities of the C language. NS: nextstep for short. In 1985, after Steve Jobs left Apple, he founded the next company to develop a new

2013-03-06 wcdj Objective-C language is an object-oriented dynamicProgramming LanguageBased on ansi c, its object-oriented syntax and ideas mainly come from small-talk. GCC directly supports objective-C. This language is widely used on Mac. If

Http://www.infoq.com/cn/articles/wwdc2012-objective-c-new-feature At WWDC 2012 this year, Apple made significant improvements to both objective-C and llvm compilers. Let's take a look at what new features have been added to objective-C. 1. Method

Multi-Inheritance Objective-C does not support multi-inheritance, but we have methods to implement pseudo-inheritance. For example, if object A is added, it cannot process the message fun, But object B can process the message. In this case, object A

Objective-C Programming path: IOS Design Pattern Analysis Study Notes -- Chapter 2 Chapter 1st: Hello, Design Pattern 1: model, view, controller (MVC) Model: The model object maintains the data of the application and defines the specific logic of

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

I. Introduction to objective-C Objective-C is a language for iPhone software development. Objective-C language is an extension set of C Language Objective-C is an object-oriented language. Case Sensitive The Program Statement must end