Objective-C

Recently, the company's operations to engage in a blind activity, its activities to provide data support services, the Web front-end in the public account as the main operating positions, and iOS, Android to provide the corresponding portals and

ARC mechanism and judging criteria Arc:auto Reference counting Automatic reference countis a compiler mechanism to add retain, release, Autorelease and other methods to our code during the compilation process.Forced to use after iOS7.0, so that

First post the code in the previous article using @property and @synthesize, and then explain the usage and meaning of these two keyword, such as the following code:Person.h file#import @interface person:nsobject { int _age; Be able to access

Type encoding (Type Encoding)As a complement to runtime, the compiler encodes the return value and parameter type of each method as a string and associates it with the selector of the method. This coding scheme is also very useful in other

the so-called framework in iOS, after all, is a directory, and iOS provides a lot of frameworks that we can call in the application. Many applications use frameworks such as foundation, Uikit, and core graphics. Depending on the template you choose

runtime abbreviation. is the system at the time of the operation of some mechanism, the most important is the message mechanism. For the C language, the function's call will decide which function to call at compile time (see here for the C-language

The dictionary holds key-value pairs that can be obtained by key1. Create an immutable dictionary1 //1 F (1)2Nsdictionary * dic = [[Nsdictionary alloc] Initwithobjectsandkeys:@" One",@"1",@" Both",@"2",@"three",@"3", nil];3NSLog (@"%@", DIC);4

The classification in objective-c allows us to augment it by adding a method to a class (but we cannot add new instance variables through category), and we do not need to access the code in the class.The protocol in OBJECTIVE-C is a ubiquitous

Blocks is objective-c objects, which means they can be added to collections like Nsarray or nsdictionary.Block syntax--no parameter version definition (value of block)^{ NSLog (@ "This isa block");}Statementvoid (^simpleblock) (void);similar to

Http://www.cnblogs.com/ygm900/archive/2013/01/16/2862678.htmlWe all know that Objective C cannot support multiple inheritance like C + +, but the use of OC often encounters situations where multiple inheritance is required. For example, there are

I. Inheritance of classesThe inheritance of classes in objective-c is similar to C + +, except that OBJECTIVE-C does not support multiple inheritance, a class can have only one parent class, and single inheritance makes Objective-c's inheritance

objective-cObjective-c extends the C language and joins the object-oriented and Smalltalk messaging mechanisms. The core of this extension is a runtime library written in C and compiled languages. It is the cornerstone of Objective-c object-oriented

The block function is a function pointer-like function, the programmer only need to put the code needs to be encapsulated in the definition of the block can be used in the future, the direct invocation, very convenient ....Examples are as

1, Introduction:The property is a objective-c keyword, used in pairing with @synthesize , to allow the compiler to automatically generate a method declaration with the same name as the data member. @synthesize is the implementation that is used to

UITableViewCell: Custom cells, you can create cells in xib, or you can create cells in Storyborad. There are four ways to create cells created in Storyborad, which are static cells, are available at the beginning of the cell and can be loaded

Use of random numbers in Objective-c (3 types: Arc4random (), Random (), ccrandom_0_1 ())1, the use of random numbers 1), arc4random () more precise do not need to generate the seed immediatelyHow to use:The code for obtaining an integer between 0

Uiscrollview Controls and Uipagecontrol controls: Uiscrollview is used to display more than one screen, content that goes beyond the screen can be viewed by swiping, and of course Uipagecontrol can be paged. Uiscrollview tend to be used with

Title 5: Used to flip individual bits from the terminal input number. Then modify the program so that the correct input negative number.Code1 intNum_5 =0, result_5 =0;2 3NSLog (@"input num_5:");4scanf"%i",&num_5);5 6

Here we customize a Carousel diagram Class Imageloop inherits from UIView, and the class Imageloop contains a Uiscrollview and Uipagecontrol, which defines three properties:Pagecontroll,position,currentpage can customize the Pagecontrol style, or

When Apple released Xcode7, it not only upgraded the SWIFT programming language to version 2.0, but also made many improvements to objective-c, including the introduction of __nonnull/__nullable. Among them, for the OBJECTIVE-C programming language