objective c for dummies

data thread created by the user himself needs to create a memory pool for that thread40. Which methods of class nsobject are often used?Answer: NSObject is the base class of Objetive-c, which is composed of NSObject class and a series of protocols.Class methods Alloc, Class, Description object Methods init, Dealloc, –performselector:withobject:afterdelay: etc. are often used41. What is a simple construction method?Answer: The simple construction meth

@objc to all variables, methods, and properties, if the class itself is preceded by the @objc keyword. When you use @iboutlet, @IBAction, or @nsmanaged properties, the @objc is automatically added to the front. This keyword can also be used in target-action design patterns in objetive-c, for example, Nstimer or UIButton.When you use the Swift API in objective-c, the compiler usually makes a direct translation of the statement. For example, Swift API

Objective-c code. In another case, if your Swift class does not originate from the Objectve-c class and you want to be able to use it in Objecive-c code, you can use the @objc attribute described below.@objc can make your Swift API available in objective-c. In other words, you can make them available in the Objective-c code by adding @objc to any Swift methods, classes, attributes. If your class inherits from Objective-c, the compiler will automatically help you complete this step. The compiler

set of data models3> Select different controllers according to Iphone\ipad (ipad may use Uisplitviewcontroller)4> choose a different interface according to Iphone\ipadKeyword atomic in Objective C? In Objetive-c What is the Atomic keyword1> Atomic is atomic2> Atomic will lock the implementation of the Set methodWhat is UIView animations? UIView's animated effects have thoseThe core animation of the UIView package can be implemented through the class

Just into the development of iOS, the feeling is quite laborious, for the complex interface of the drawing is more difficult. Talk not much, turn to the point ...Today, I encountered the "linker command failed with exit code 1 (use-v to see invocation)" Question,What makes me depressed is that Xcode doesn't point out the code for a specific error, which makes it more difficult for a novice to find a problem,Here's a summary of the mistakes I've encountered:1. Images that are linked or used in St

. CGRect and NSString ConversionCGRect rect = CGRectMake (00); *rectstring = nsstringfromcgrect (rect)) = cgrectfromstring (rectstring);10.CGRect and Nsdictionary ConversionCGRect rect = CGRectMake (00= Cgrectcreatedictionaryrepresentation (rect); Nsdictionary// autoreleasedcfrelease (framedictref); NSLog (@ "%@"rect);CGRect and Nsvalue ConversionOnly OBJETIVE-C objects can be stored in the Nsarray,nsdictionary container, and C structures canno

TestObjectiveFunction(t *testing.T) {if 5 != objective_function([]float64{1, 2}) {t.Error("Objetive function failed")}}func TestSearch(t *testing.T) {//var problem_size = 2var search_space = make([][2]float64, problem_size)for i, _ := range search_space {search_space[i] = [2]float64{-5, 5}}//const max_iteration = 100//var best = RandomSearch(search_space, max_iteration)if best.Vector == nil {t.Error("Search result should not be nil.")}fmt.Println("Do

From: http://oasku.com /? Q-104.html First, start with copy. In short, the purpose of copy is to generate a new instance and assign values to all its members based on the original Instance. For non-pointer-type members, such as BOOL, int, float, such values can be directly assigned. However, for pointer-type data, such as objects used in Objc, There is Deep Copy and Shallow CopyDifference-this is basically the same as in C ++: Yes Generate a new member object, Or Point to the same Member object

IOS Xcode: linker command failed with exit code 1 (use, xcodelinker I just transferred to iOS for development, but it is still difficult to draw complex interfaces. Let's not talk much about it... Today, we have another problem with "linker command failed with exit code 1 (use-v to see invocation, What bothers me most is that Xcode does not point out specific error code, which makes it more difficult for a newbie to find a problem, The following is a summary of my errors: 1. The link or i

that the use of Nsarray only indicates that the array does not change at run time, i.e. it cannot add and remove elements to the Nsaarry array, but does not indicate that the contents of elements within its array cannot be changed. Nsarray is thread-safe, Nsmutablearray is not thread-safe, and multithreading is used to nsmutablearray needs attention.19. Which methods of class nsobject are often used?A: NSObject is the base class of Objetive-c, which

@objc to all variables, methods, and properties, if the class itself is preceded by a @objc keyword. When you use @iboutlet, @IBAction, or @nsmanaged properties, @objc is automatically added to the front. This keyword can also be used in target-action design patterns in objetive-c, such as Nstimer or UIButton. When you use the Swift API in Objective-c, the compiler basically translates the statements directly. For example, Swift API func playsong (n

network communication functions very simple.Support for HTTP requests and rest-based network services (including GET, POST, PUT, delete, etc.)Support ArcRequires iOS 5.0 and laterThere are plugins that extend existing functionality and a full-featured APIHow easy is it to get json from a URL? Take a look at the following lines of codeNsurl *url = [Nsurl urlwithstring:@ "Https://alpha-api.app.net/stream/0/posts/stream/global"]; Nsurlrequest *request = [Nsurlrequest Requestwithurl:url]; Afjsonreq

other things, such as text that needs to be displayed, animations, x and Y settings, and so on, and many iOS instructors are using it, typically used for in-app purchasesMbprogresshud applies to any iOS version, requires LLVM3.0 and above compiler architecture, compatible with arc and non-arc projects, depending on Apple's following architecture:Foundation. ArchitectureUIKit. ArchitectureCoregraphics. ArchitectureTransparency Progress Effect10) afnetworkingafnetworking is a lightweight iOS Netw

actually a pointer to the instance variable of this object.Example: ID numberDeclare number as an ID variable. Declarative methods make them return values of the ID type as follows:-(ID) newobject; (INT) type;This program declares an instance method named newobject, which has a single integer parameter named type and a return value of ID type. It should be noted that, for the return value and parameter type declaration, ID is the default type.The ID type is the data type of unusual Chinese drug

source code of the XIB file. Next, let's take a look at mainwindow. XIB of the project and find that there is more content on the left side of the file. In the ios xib file, you can add any Objetive-C objects to the XIB file, which is created and destroyed by XIB (an autorelease object ). In this file, there are two object containers with advancedtableviewcellsappdelegate and uinavigationcontroller, which are often used in previous versions. In thi

personal information may store personal names, birthdays, addresses, and other content. You can declare some instance variables in the public section of the class interface: @interface EOCPerson : NSObject{@public NSString* _firstName; NSString* _lastName;@private NSString* _someInternalData;}@end; People who have used Java and C ++ are familiar with this method and can define the scope of variables. OC seldom does this. The variable memory layout in this writing method has been fixe

csdn. There are quite a few! The following describes the disguise of the system. Camouflage 10.5.7 is acceptable! Others may not work. Interested friends can try it on their own. 1. Download the iPhone SDK installation package: iphone_sdk_3.0 _ leopard _ 9m2736 _ final. DMG (download from the official website)2. Change the system version of 10.5.5:1) Find/System Disk/system/library/coreservices/systemversion. plist2) Open and modify it: 3) before saving the file, change the properties of the

Research tools Clang in order to study the compiler implementation principle, we need to use the clang command. The clang command can be used to rewrite the source code of the objetive-c into C + + language, which can be used to study the source code implementation of each feature in block. CLANG-REWRITE-OBJC main.m The Uikit framework cannot be included in main.m, and parsing in the command line is not recognized. Includes

Log-------The successful use of block in JavaScript calls the method back to Objective-c, and still follows the various features of the JavaScript method, such as the method parameter is not fixed. Also because of this, JSContext a class method is provided to get the argument list ( + (JSContext *)currentContext; ) and the object that is currently calling the method ( + (JSValue *)currentThis ). For "this" , the content of the output is GlobalObject that this is JSContext what the object method

(nonatomic, copy) NSString * text; @ End Thenclass_addProtocolAdd the Protocol to it: -(Void) viewDidLoad {[Super viewDidLoad]; TextField. text = @ "7 ";Class_addProtocol ([UITextField class], @ protocol (JSUITextFieldExport ));} ForUIButtonAdd the following event as long astextFieldInputJSContextAnd then read itstextValue, which is re-assigned after auto-increment 1: -(IBAction) pressed :( id) sender {JSContext * context = [[JSContext alloc] init]; Context [@ "te