Objective-C

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

Translated from http://www.rijiyuelei.me/2012/09/enum-and-string-conversion-in-objective-c/The use advantages of enumeration types There's nothing to say. However, it is often necessary to convert it with strings to facilitate display or other

OBJECTIVE-C 2.0 adds the class extensions to solve two problems: Allows an object to have a private interface and can be validated by the compiler. Supports a public read-only, private writable property. Private Interface

To intercept the entire screen size:1 Uigraphicsbeginimagecontext (self.view.bounds.size); 2 3 [Self.view.layer Renderincontext:uigraphicsgetcurrentcontext ()]; 4 5 UIImage * viewimage = uigraphicsgetimagefromcurrentimagecontext (); 6 7

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 purpose of this article is to understand how NSAutoreleasePool is used in objective-c , andobjective-c 's foundation library is actually a run-level object system. Unlike general object languages, such as C++,java, objects, like COM or CORBA,

This paper mainly records the knowledge points of objective-c memory management;1, Objective-c objects are allocated within the heap, and C Mallock and C + + similar, only int and other system variable allocation within the stack;2, Objective-c No

OC provides the ability to extend the method of the class without modifying the source code of the class, the "classification" category, which is similar to the extension method in C #, generally used in the inconvenient to modify the source code of

See this article as you have learned the basics of object-oriented.(I think this theory of the concept of something, no one teacher will understand when they say it.)Here does not mention my teacher how NB, he said several times I did not understand,

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

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

 cocoapods A management tool for a objective-c third-party libraryCategory: Getting Started with iOS 2012-11-19 14:17 40945 people Read Reviews collection reports Directory (?) [+]Introduced:Third-party libraries are indispensable when

1. Definition and declaration of classesThe class declaration in OC ends with @interface beginning @end.The class definition in OC ends with @implementation beginning @end.Method declarations in OC:-(void) SetName: (nsstring*) strName; Front

First, memory management Golden rule:The basic rule to Apple are everything thatincreases the reference counter with Alloc,[mutable]copy[withzone:] or Retainis In charge of the corresponding [Auto]release.If an object uses Alloc,[mutable]

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

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

In Objective-c, we can use the numeric data types in C, int, float, long, and so on. They are all basic data types, not objects. That is, it is not possible to send messages to them. Then, there are times when you need to use these values as objects.

I. Inheritance1. Inherited upper layer: parent class, inherited lower layer: subclass2. Inheritance is one-way3. Inheritance has transitivity: subclasses inherit the characteristics and behavior of the parent class4. Subclass extension Parent class,