xcode 在iOS中在哪里设置环境变量？
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Where to set environmental variables in iOS?
提问by jini
In my development I wish to hit a development URL when im testing but when the app is run on my iPhone, I want it to run on production URL. How do I get about setting this in Xcode?
在我的开发中，我希望在测试时访问开发 URL，但是当应用程序在我的 iPhone 上运行时，我希望它在生产 URL 上运行。我如何在 Xcode 中设置它？
Almost seems like I need to be able to set environmental variables (which in this case are different URLs).
几乎似乎我需要能够设置环境变量（在这种情况下是不同的 URL）。
Where do I set these up? Please hand hold me on the answer as I am fairly new
我在哪里设置这些？请握住我的答案，因为我是新手
Thanks
谢谢
回答by Erik
There are lots of ways to do this. My preferred method is to create a file called Constants.h that looks like this:
有很多方法可以做到这一点。我的首选方法是创建一个名为 Constants.h 的文件，如下所示：
//
// Constants.h
//
#ifndef Constants_h
#define Constants_h
#pragma mark - Instances
#ifdef DEVELOPMENT
#define ROOT_URL @"http://127.0.0.1:8000"
#endif
#ifdef STAGING
#define ROOT_URL @"http://staging.example.com"
#endif
#ifdef PRODUCTION
#define ROOT_URL @"http://production.example.com"
#endif
Then, I just include it in my *-Prefix.pch file like this:
然后，我只是将它包含在我的 *-Prefix.pch 文件中，如下所示：
#ifdef __OBJC__
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import "Constants.h"
#endif
In your build settings, set DEVELOPMENT, or STAGING, or PRODUCTION = 1.
在您的构建设置中，设置 DEVELOPMENT、STAGING 或 PRODUCTION = 1。
Now you can access things like ROOT_URL anywhere in your project.
现在，您可以在项目的任何位置访问 ROOT_URL 之类的内容。
Good luck!
祝你好运！
回答by bshirley
I prefer the #definemethod as well. For those less familiar, those are pre-processor directives and are set even before the compiler gets hold of the code.
我也更喜欢这种#define方法。对于那些不太熟悉的人，这些是预处理器指令，甚至在编译器获取代码之前就已设置。
Environment variablesare set at runtime of the program, and can be manipulated in the scheme editorof Xcode 4.x+. You could set up different schemes to hit different testing environments.
Environment variables在程序运行时设置，可以在scheme editorXcode 4.x+ 中操作。您可以设置不同的方案来满足不同的测试环境。
To access an environment variable at runtime from within your code, use the following:
要在运行时从代码中访问环境变量，请使用以下命令：
NSString *url = @"http://standardurl.com";
NSDictionary *env = [[NSProcessInfo processInfo] environment];
NSString *overrideURL = [env valueForKey:@"url"];
if (overrideURL != nil)
url = overrideURL;
回答by nuxibyte
You can also set the different URLs in your plist file by adding new String rows if you don't want to use a constants file.
如果您不想使用常量文件，还可以通过添加新的字符串行在 plist 文件中设置不同的 URL。
(Not much to be gained here though I admit but depends on where you prefer to set up your urls)
（虽然我承认，但在这里获得的收益并不多，但这取决于您更喜欢在哪里设置网址）
In your myApp-plist file add new rows like this:
在您的 myApp-plist 文件中添加新行，如下所示：
"DevelopmentEndpoint" "String" "http://development.endpoint.com"
“DevelopmentEndpoint” “字符串” “http://development.endpoint.com”
"ProductionEndpoint" "String" "http://production.endpoint.com"
"ProductionEndpoint" "String" "http://production.endpoint.com"
In your code:
在您的代码中：
// Get endpoint from main bundle
#ifdef DEVELOPMENT
NSString *endpoint = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"DevelopmentEndpoint"];
#else
NSString *endpoint = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"ProductionEndpoint"];
#endif
In your build settings add DEVELOPMENT under the "Preprocessor Macros" section for Debug or Release etc.
在您的构建设置中，在调试或发布等的“预处理器宏”部分下添加开发。
