Objective-C

If you want to learn OC but have no Mac computer classmate, you can try the following methods to solveWe use GNUstep to learn Objective-cFirst step: Install the required software and build the environmentsudo apt-get install gnustepsudo apt-get

First look at the code used in Tomcat: //then start the animation//Put the picture in the Animationimages, accept the array parametersSelf.tom.animationImages =Arrayimage; //set the time interval, 81 graphs, the picture is a little longer than

Quick EnumerationFor ( in ) {}object is a traversal of the resulting element object, collection is a collection-type object: An array, a dictionary, a collection.An array enumeration gets the element objects in the array.The dictionary enumeration

1. Defining ArraysSyntax format:Type Arrname[length]Length can be either a fixed integer value or an integer variable or an integer expression.If the element is not initialized when the array is defined, the default value is assigned to the element.

This is a stopgap measure, and in the absence of Mac OS X, use this scheme to get a sense of objective-c.If it feels good to play down, want to go deeper, or the whole Mac.One: Compile environment installation GNUstepwww.gnustep.org website Download

1. Create a new class that inherits from UITableViewCell2. Overriding Initwithstyle:reuseidentifier: MethodsAdd all the child controls that need to be displayed (you don't need to set the child control's data and frame, and the child controls are

Super classThat is, the parent class can call the superclass method through [Super SetName: @ "a"]CompositeRefers to an object that consists of several other objectsObject initialization@interface*engine;)@end@implementation Car-(ID)　　init{

Today, to sort out the contents of objective-c literals, the literals translates into literal values or literals, which are directly written to the source code. This is not an unfamiliar concept, we can often see when writing programs. We've seen

The framework refers to Objective-c's foundation library, which gives several common classes and their methods in the following example. Numeric objects NSNumber *Intnum; NSNumber*Longnum; NSNumber*Floatnum; Intnum= [NSNumber

So what are the drawbacks of categories compared to inheritance? A class cannot declare a new member variable, and once you define a partyMethod is the same as the method name in the original class, the original method will be hidden because it is

this article reprinted to http://www.cocoachina.com/ios/20141124/10296.htmlI believe we all know about the 23 design patterns mentioned in Gof's "Designing Patterns", which divides the common design patterns into three categories: the creation model,

objective-c Proxy Mode (delegate)One, what is the proxy mode? Proxy mode is a kind of design pattern that is often encountered in OC, what is called proxy mode? For example: There is a baby, he himself does not eat and bathe and so on some things,

1. We talked about the memory management base in OC, and we'll summarize when we should use memory management.1) When you create an object with new, alloc, copy, you must release the object.2) When you have an object, you do not need to release it

Nsarray (Array)Create three string objectsNSString *str1 = [NSString stringwithformat:@ "IPhone4"];NSString *STR2 = [[NSString alloc] initwithformat:@ "IPhone5"];NSString *STR3 = @ "IPhone6";NSLog (@ "%@%@%@", STR1,STR2,STR3);Nsarraymethod

What is polymorphic?Polymorphism (polymorphism) literally means "multiple states." In object-oriented languages, many different implementations of interfaces are polymorphic. The description of polymorphism is referenced by Charlie

"Introduction to environmental construction"The development environment must be built on Apple's Mac OS system. So whichever way you do, you need at least one computer with a Mac OS system in place.You can get Mac OS by buying an Apple computer or

OBJECTIVE-C message and message forwarding mechanismFirst, the basic concept1. Method data structure in Objc_classtypedef struct OBJC_METHOD *method;typedef struct OBJC_ Method {SEL method_name;Char *method_types;IMP Method_imp;};2. SELtypedef

#pragmaMark's copy of the demo string//deep Copy--object copy--content copy (generate new Object) New Object counter +1, original object unchangedvoidstringmutablecopy () {//string = 1NSString *string= [[NSString Alloc]initwithformat:@"Age is

In the previous article, we introduced the class-and object-related content in runtime, and from this chapter we will discuss the content of class implementation details, including the implementation of member variables, properties, methods,

Code blocks are essentially similar to other variables. The difference is that the code block stores the data as a function body. With code blocks, you can pass in the number of arguments as you would call other standard functions, and get the