oc cox

Immutable string"Initialization of OC string"1. Initialization of strings (subtraction method)NSString * str2 = [[NSString alloc]init];2. Initialization of strings (plus method)NSString * STR3 = [NSString string];3. Initialization of a string is given by another stringNSString * STR4 = [[NSString ALLOC]INITWITHSTRING:STR1];4. Give the C-language string The OC string as the initialized value (minus method)NS

OC Memory ManagementFirst, the basic principle(a) Why memory management is needed.Because the memory of the mobile device is extremely limited, so the memory of each app is also limited, when the app consumes more memory, the system will issue a memory warning, you need to reclaim some no longer need to continue to use the memory space, such as recycling some of the unused objects and variables.Managed Scope: Any object that inherits NSObject and is n

ObjectiveDue to the limited memory of the mobile device, we need to manage the memory tightly so as to avoid the resource wasting caused by the memory leak. In OC,只有对象才属于内存管理范围，例如int、struce等基本数据类型不存在内存管理的概念。在iOS开发中，对内存的管理实际上就是对引用计数器的管理。Three ways of OC memory management Automatic garbage collection (Automatic garbage Collection); Manual reference counter (Manual Reference counting) and auto-rel

Tip: Ns:nextstep cg:coregraphicsNSString: Immutable string nsmutablestring: mutable stringURL local file header: file://URL Network File header:/httpint main (int argc, const char * argv[]) {int age = 10;1. Creation of stringsNSString *s1 = @ "as God name";NSString *s2 = [[NSString alloc] initwithstring:@ "Welcome to learn OC"]; Not usedNSString *S3 = [[NSString alloc] initwithformat:@ "Welcome to learn oc,

Getting started with iOS development☞OC language · pre-school preparation, iosocBasic knowledge 1. Preface In Windows, the executable file format is. exe. The Mac system executable file format can be any The OC language is enhanced and expanded on the basis of the C language. The OC language is compatible with all the C language syntax, and its unique features ar

OC and JS call each other and OCJS call Html5 is used in recent projects, involving OC calling JS and JS calling OC methods. Here we will introduce the problems and implementation methods. /// ViewController. h // OC_And_JS /// Created by Zhang Jie on 15/7/9. // Copyright©2015 Zhang Jie. all rights reserved. // # import /// ViewController. m // OC_And_JS ///

OC Memory Management I. Basic Principles (1) Why memory management. Because the memory of mobile devices is extremely limited, the memory occupied by each app is also limited. When the app occupies a large amount of memory, the system will issue a memory warning, in this case, you need to reclaim some memory space that you do not need to continue using, for example, reclaim some objects and variables that are no longer in use. Management scope: any ob

1#import"ViewController.h"2 3 @interface Viewcontroller ()4 5 @end6 7 @implementation Viewcontroller8 9-(void) Touchesbegan: (NssetEventTen { One [self test]; A } - --(void) Jsontooc the { - //1. Determine the URL -Nsurl *url = [Nsurl urlwithstring:@"Http://120.25.226.186:32812/login?username=123pwd=456type=JSON"]; - + //2. Create a Request object -Nsurlrequest *request =[Nsurlrequest Requestwithurl:url]; + A //3. Sending an asynchronous request at[Nsurlconnection sendasyn

Recently in writing some code about Wkwebview, found a few tips, record. 1.js Call OC I am using Wkwebview to develop the implementation, the main code has three parts1. Inject the OC object into config [config.userContentController addScriptMessageHandler:self name:@"YHModel" ];The method of writing calls in 2.js:window.webkit.messageHandlers.YHModel.postMessage({ height: $("html").height()

OC is also called object-oriented C, and a minimal object-oriented syntax is added on the basis of C language.Characteristics:1. Fully compatible with C language2, can be in the OC code mixed with C language code, or even C + + code, not any source code can write C + + code, to the extension of the name to change to be able to write3. Applications for MAC OS x platform and iOS platform can be developed in O

IOS Static Class Library compilation c,c++As we all know, OC Native support C, in the creation of the OC class in the. m, you can write the C code directly;Also Xcode supports OC, C + + mixed, at this time, we usually put OC created. m files, manually modified to. mm files to support

Swift and OC mixing and SwiftOC Mixing Swift is quite popular when it comes out, but there are still many third-party libraries that do not support Swift. I personally feel that Swift still has a long way to go. And even the founders of Swift have recently left apple ......... What should I do if I use third-party things in Swift? In fact, it is very simple. Xcode will automatically create a bridge file for you to connect Swift and

How to build an OC client program1. The first program of OC2. Data type of OC3. Written specifications of OC4. Format characters for OC1. How do I build a OC client program?Open Xcode and select Create a new Xcode projectOn the left, click the OS X->command line tool control toolsProductName: Project NameOrganizationName: Organization NameOrganization Identifier: Organization logo (usually the company domai

Recently, there is a product activity interface, to communicate with the Web, the user in the page click on the product ID to the client, that is, JS interaction, in fact, it is the method of mutual call.This article describes how to perform native JavaScript interactionsThis article includes JS call oc method and pass value, OC Call JS method and pass valueOriginally wanted to put HTML into the server, and

A day of learning swift, and after it was mixed with OC, I suddenly felt the language was fine.The following is a brief talk about its pointers1. Create a swift or OC project: I am here to create the Swift language project, project name Swifttest2, in the Project code directory to create a OC class, select the OC Langu

OC is an object-oriented language, so it also has the concept of class, object, static \ Dynamic method, member variable. This is to create the first OC class.The source of the first class:1 /*2 people3 class Name: Person4 attribute (member variable \ instance variable): weight, age5 behavior (method): Walking, eating6 */7 8 #import9 Ten //1. Declarations of Classes One @interfacePerson:nsobject A { -

15:08:02 2017-03-06Official explanation DocumentSwift and Objective-c in the same ProjectIn fact, just know the method, very simple;Creating a swift file in the OC project, or creating an OC file in a swift project, will automatically prompt for the need not to produce the bridge file (Xxx-bridging-header.h);Of course you can create this bridge file manually, and then add the path to the bridge file in the

First, the basic principle(a) Why memory management is needed.Because the memory of the mobile device is extremely limited, so the memory of each app is also limited, when the app consumes more memory, the system will issue a memory warning, you need to reclaim some no longer need to continue to use the memory space, such as recycling some of the unused objects and variables.Managed Scope: Any object that inherits NSObject and is not valid for other basic data types.The intrinsic reason is becau

OC Introductory First LessonHELLO.M (Implementation) hello.c#import #include Import is an enhanced version of include, pre-processing only onceCompile Link: clang hello.m-framework Foundation(-fobjc-arc compiled with automatic reference count)//terminal default is manual reference count(-fno-objc-arc compiled with manual reference count)class declaration: Only methods and variables can be declared (may be used in Chinese characters, but generally with

I. INTRODUCTION of OCOn the basis of C language, a layer of minimal object-oriented syntax is added, fully compatible with C language, C language code can be mixed in OC code, or even C + + code, and you can use OC to develop applications for Mac OS x platform and iOS platform.Second, OC Syntax Preview (i) keywordsBasically all the keywords are at the beginning o