Objective-C

Look at the topic and know what this article is written about. BackBtn.frame.size = cgmakesize (+); This is the wrong way to do it. In OC, a member of the struct property of an object is not allowed to be modified, the above statement, BACKBTN is

Now we'll use objective-c to define an actual class and learn how to use an instance of the class. Again, we will learn the process first. Therefore, the actual procedural paradigm may not be particularly practical, and those more practical content

objective-locks and applications in C in multithreaded programming, locks are a very important tool, and objective-C provides several different types of locks, so let's look at how these locks are used. 0. POSIX Mutex Lockmutex Lock is also a mutex,

The Objective-c method is described by two data types: One is the selection sub (SEL), which describes the name of the method, and the other is the implementation (IMP), which describes the code that is actually executed when the method is called

Singleton is a class that can only instantiate an object. Although this is a practical definition of a singleton, it is not necessarily the case in the foundation framework. Like whatNsfilemangerAndNsnotificationcenter,By their class method,

We often use structs to help us simply encapsulate basic data types in C/D + + development, and we can use structs to encapsulate data types in objective-c. At the same time, Cocoa Touch provides a nsvalue to help us better use structs in

I. Open Xcode and create a new Xcode projecttwo. Select the simplest command line itemSince we are only learning OC syntax and have not formally entered iOS development, select command line items tothree. Enter the project name and select the

Predicate: nspredicate1, Overview:Used to set the condition of the specified filter, the popular understanding is to set the conditions of the selection, and then apply the condition to the specified object2, Usage:A, set the predicate

1: What is @property?In Objective-c, @property is the syntax for declaring attributes, which makes it quick and easy to create getter/setter methods for instance variables.2: The nature of @property?@property = Ivar + setter + getter, is actually

1. Hello, world#importint Main (){/*my First program in OBJECTIVE-C*/NSLog (@"Hello, world! \ n"); return0;}2. Block (function pointer like C, JS closure, c++11 lambda functions)(1) Example__blockintsum =0;int(^MYBLOCKS3) (intAintb) = ^ (intAintb)

want to improve the next to do the application to the customer to take the experience, so watched a few days OC Caanimation Animation class, also done a few small cases, the following individual cases to do as the main content of this article. One:

First, the use of autoresizing (understand)Only the parent control can be referenced1, to achieve the screen switching, can not be the control of the frame capillary, the need for screen adaptation2. You need to refer to the parent controlUse Auto

This article turns from: Http://blog.csdn.net/yuquan0821/article/details/6646400/, overviewKVO, Key-value Observing, provides a mechanism for the object to receive notification when the properties of the specified object have been modified. Simply

First, the knowledge point:1. Nested use of dual models2, the button of the Alignment method3, optimize the load of UITableView4, the use of Layoutsubview5, the cell's folding agentTwo, nested definitions of two models:Note that the self.friends is

Objective-C categories (category)1. When you want to add methods to a class, you usually expand (extend, that is, inherit) it. However, this is not necessarily a perfect solution, especially if you want to rewrite a class A feature, but you do not

Source annotations Mainly supports several checks Specific topicsAnnotations to enhance generic checksNull Pointer checkingAttribute 'nonnull'Mac OS X API annotationsCocoa & core Foundation memory management annotationsAttribute 'ns _

Difficult to express original meaning in Chinese Method and class attributes Objective-CNow supports some GCC attributes for objective-C methods.Syntactically, attributes for a method follow the method's declaration,And attributes for a method

Zproperty declaration attribute DeclarationSpecifying the attribute (attributes) for instance variables allows the compiler to generate methods for accessing instance variables without leakage and thread security. Property) @property (copy,

This article has a delete section: Integer Data (INT) In objective-C, the int type can store positive or negative integers (I .e. no decimal places). The number of INTEGER (INT) digits depends on the target machine, which is determined during the

From: http://kingj.iteye.com/blog/1558869 Objective-C is the programming language of Apple software. It is much easier to have an integrated development environment (IDE) for machine learning and debugging. There are three ways to build an