swift macros

Using some commonly used macros during iOS development can improve development efficiency and code reusability; placing these macros in a header file and then putting them in the project-prefix. in the PCH file (or directly put it in-prefix. in PCH. This article is organized from http://www.cocoachina.com/applenews/devnews/2013/0328/5907.html. You can add, delete, or modify these

printed if it is found. This parameter is null. If the third parameter cannot be found, the information to be printed, the Macro that prints the error message "ac_msg_error" is used here. Then, you can see its. M4. It gives you the gtk_cflags and gtk_libs in ac_subst, and then uses @ in makefile. AM to reference them. In fact, GTK not only places the. M4 file in/usr/share/aclocal/, but also places the. PC file in/usr/lib/pkgconfig, as mentioned above. Which one do you want to use. 3. The Librar

IOS debugging skills-compiler predefined macros As we all know, Objective-C is a superset of C language and must retain some features of C language. Today, we will use the predefined macros of the compiler to output some information to debug the program. These macros include: (1) _ FUNCTION _: // obtain the current method name; (2) _ func _: // obtain the current

/***1. Macros are simply replaced when the compiler is compiling the source code, without any logical detection, that is, simple code copying. 2. When a macro is defined, the type of the parameter is not considered. 3. The use of a parameter macro causes a block of code with the same effect to have multiple copies in the destination file, which increases the size of the target file. 4. Parameter macros run

The reference count is clever and convenient, but most of the processing processes involve pointers, which are cumbersome and error-prone. To address this problem, Cocos2d-x is accurate for us A series of auxiliary macros are provided to simplify the Code. These macros are included in the header file "ccplatform Macro. H. Table 2-2 lists the macros related to mem

In iOS development, macro definitions are often used, or some data types are modified with const, and often developers do not know how to use them correctly, resulting in the confusion of macros and const decorations in the project.Can you distinguish between the following? Do you know when to use it?#define Hscoder @"Hansha haha"nsstring *hscoder = @ "Hansha haha"; extern NSString *hscoder; extern const nsstring *hscoder; Static Const NSString *hs

Variadic Macros is function-like macros that contain a variable number of arguments.RemarksTo use Variadic macros, the ellipsis is specified as the final formal argument in a macro definition, and the ReplacemENT identifier __va_args__ May is used in the definition to insert the extra arguments. __va_args__ is replaced by all of the arguments that match the ellip

6. The instructions for macro actions are not required when you use macros, but you can make macros easier to understand and maintain. You cannot use SQL expressions in the Criteria column of a macro. Typically, the direct execution of a macro is just a test. You can either attach a macro to a form, report, or control to respond to an event, or create a custom menu command that executes a macro, after you m

1, click Macros from the Macros submenu on the Tools menu. 2. In the Macro name box, click the macro: an action or a set of actions that you can use to automate tasks. You can record macros in the Visual Basic for Applications programming language. ) is named. If the macro does not appear in the list, in the Macros i

In the process of making PowerPoint courseware, a courseware often contains multiple slides, and for the sake of the beauty of the courseware, a different picture is inserted into the background in almost every slide. The same insert background image operation repeated n times, it is too tiring. In fact, you can do this quickly by "macros". Create a new folder named "Background" in any location on your hard disk (such as the F-packing directory). The

1. Overview After the const keyword is in C + +, the function of the macro definition constants is no longer recommended. This makes the macros seem useless. In fact, the macro can do a lot of things, the author is difficult to enumerate all. Here, just a few typical usage, I hope you can benefit from it. 2. Realize multi-environment compatibility The common scenario is that we implement a function that wants it to only be satisfied in some kind of

In the final section of VBA learning, I would like to emphasize that to make good use of recording macros, Excel's Help and network search. In the process of self-study VBA, I often say to use more-learn-think-more and Beginners self-study VBA also three big tools: Recording macros, VBA Help and network search. Make good use of these three kinds of words, many problems do not need the help of others can so

Excel 2013 Macro-enabled methods: Enabling macros Step 1: Because the interface changes are still relatively large, so here also explains the location, open Office 2013 Excel, if you are not entered by the file, then we click on a "Blank Workbook": Enable Macros Step 2: Click "File" on the menu bar, then select "Options", and in the Pop-up Options menu, click Trust Center settings in the Trust Cente

English version of PDFhttp://download.csdn.net/detail/tsingheng/7480427The operator refers to a special symbol that can be used to view. Change the value or add it. Let's say the addition operator + can speak two numbers together.Other complex examples are logic and or self-increment + +. Swift supports most of the operators in C, and adds some enhanced features to reduce errors in the code. The assignment Budget character = does not return a value.

Swift is a new programming language for the development of IOS and OS X applications, however, its development experience has much in common with C or objective-c. Swift provides all the underlying types in C and objective-c, including int representing integers, Double and float for floating-point numbers, bool for Boolean values, and String that represents plain text data.

In the project right-click Add a swift file, I added the Learnswift.swift add after Xcode popup ' whether to configure OC Bridge header file ' Prompt, click Confirm, the system automatically generates a project name-bridging-header.h file, mine is Learnswift-bridging-header.h. Tips for configuring OC Bridge header Files Learnswift-bridging-header.h is essentially a header file for Swift, where all OC head

Swift getting started tutorial 12-optional links, swift getting started tutorial 12- Optional chain Original Blog, reprinted, please indicate the sourceMy blog address Http://blog.csdn.net/hello_hwcThe optional chain provides an optional way to access the attributes, methods, and subscript scripts of an object. The returned values of the optional chain must be optional.Advantage: Alternative force resolutio

Author: fengsh998 Original address:http://blog.csdn.net/fengsh998/article/details/34440159 Reprint Please indicate the source Assuming that the article is helpful to you, please leave a message or follow the public account fengsh998 to support me, thank you! After the swift language comes out, it may be possible for new projects to be developed directly using Swift. However, you may encounter some situati

class.Using the third-party framework设置： target-->build setting -->Packaging -->Defines Module为 “Yes”；然后，配置文件Target -> Build Phases -> Link Binary，添加要导入的Framework；最后，还是要配置桥接文件，比如要使用 abc-lib.framework库中的 abc.h 就要这样配置：#import"abc-lib/abc.h";Subclass sub-Class problemsFor a custom class, the class of objective-c cannot inherit from Swift's class, that is, the OC class to be mixed cannot be a subclass of the Swift class. In turn, the

Vb. NET automatically loads. xla filesPublic Function Loadxla (ByVal xlapath as String, ByVal load As Boolean) As Boolean Dim loaded As Boolean = False T Ry If (file.exists (Xlapath)) then Dim o as Object o = XlApp.AddIns.Add (Xlapath, True) ' defined as Object,add by Danielinbiti o.installed = load loaded = o.installed End If Catch loaded = False End Try Loadxla = Loa