Objective-C

There are 3 main usage scenarios for Category: Add a method to an existing class; Splitting the implementation of a class into multiple independent source files; Declares a private method. Implementation Principle : We know that regardless of

The role of the Protocol is similar to the multiple inheritance of abstract base classes in C + +. Similar to the concept of an Interface (interface) in Java.A protocol is a list of methods that are shared by multiple classes, and the methods listed

1 #import 3 4 5 Span style= "color: #000000;" > Intlegscount; 6 7 8 9 -(void 10 11 -( void ) Setlegscount: (int ) count; 12 13 @end   In objective-c, the definition of a class begins at the beginning of the

TopicOn the topic, known A is Grandpa, B is Father, C is grandson.@interface a:nsobject-(void) F; @end @interface b:a-(void) F; -(void) g; @end @interface c:b-(void) F; @endA,b,c each implement the function F, only B implements the function

The Objective-c class in the core processing string is NSString and nsmutablestring, the biggest difference between the two classes is that the content and length of the string cannot be changed dynamically after nsstring creation of the assignment,

———————————————————————————————————————————Dynamic type detectionCode:#import @interface Animal:nsobject-(void) run;-(void) ABC;@end@implementation Animal-(void) run{NSLog (@ "Animal run!");}-(void) ABC{NSLog (@ "abc!");}@end@interface

The Objective-c class in the core processing string is NSString and nsmutablestring, the biggest difference between the two classes is that the content and length of the string cannot be changed dynamically after nsstring creation of the assignment,

I. General wording of setter and getterSetter and getter can be said to be a class of the most basic things, any object-oriented language, all this concept, C + +, Java and so on. Because setter and getter are the most basic support for

1), arc4random () more precise do not need to generate the seed immediatelyHow to use:The code for obtaining an integer between 0 and X-1 by Arc4random () is as follows:int value = Arc4random ()% x;The code to get an integer between 1 and X is as

Nsmutablearray modifies elements, using -insertobject:atindex: and -replaceobjectatindex:withobject: All can, that is, by inserting ( Insert) and replacement (replace) can be implemented.Example://Reduce button monitoring- (void) Onsubbtnpressed:

The Uitextfield class does not have a maximum length attribute and needs to be set through delegate.1. Inherit the Uitextfielddelegate interface.@interfaceMYClass () @end2. Set the interface.// timesField: 初始化的UITextField[timesField setDelegate:self/

First of all we need to create a class, in order to facilitate understanding of the real life of the simulation to find intermediary rent house, so first create a person class1. Define the proxy protocol in Person.h and complete the proxy method

11.1 Using attribute values@propertyfloat rainHandling;//表明此类具有float类型的属性，其名称为rainHandlingNote: The name of the property does not have to be the same as the instance variable name.@synthesize rainHandling;//表示创建了该属性的访问代码Note : After you use a

Artifice refers to a skill and a product that is too kit and useless.Reprint please specify the source http://blog.csdn.net/uxyheaven/article/details/46789065As we all know, in general, we are not able to add attributes to the category.If you want

Reference: http://blog.csdn.net/hahahacff/article/details/39839571After watching the video, the article summarizes the OBJECTIVE-C memory management that you understand.This article from the top to the next step in depth.ARC1. Basic operating

The category in OC is similar to the extension in Swift. It is often used to extend some methods to objects of the basic data types such as int, NSString, Nsarray, and so on.There are two main uses: the basic type extension and the function forward

Description method#import "Person.h"@implementation Person- (void) Setage: (int) Age {_age=Age ;}/** Determines the output result of the instance object **/-(NSString *) Description {return[NSString stringWithFormat:@"age=%i", _age];}/** Determines

Main references in this series:Objective-c Runtime ReferenceObjective-c Runtime Programming GuideMajor documents involved: Objc/message.h,objc/objc-api.h,objc/objc.h,objc/runtime.hCool bar [tekuba.net] Use the Creative commons agreement "attribution-

Http://www.cocoachina.com/ios/20150617/12148.htmlOverviewSince the launch of the WWDC 2015 and the Open source Swift 2.0, everyone's enthusiasm for Swift has soared again, while the envious startups ' friends talk about Swift's new features, as well

Basic conceptsProgram of the world and the Human "object" of the world in the mind is no difference, rich two generations inherit the parents, naturally have all the resources parents have, the subclass inherits the parent class also has the parent