iOS创建宏 [英] iOS create macro

问题描述

我有一段我经常使用的代码，并希望用它制作一个宏。我不确定如何做到这一点。这是我想要使用的代码

I have a piece of code I'm using fairly often and would like to make a macro out of it. I'm not exactly sure how to do that though. Here's the code I want to use

UIImage *titleImage = [UIImage imageNamed:@"myLogo.png"];
UIImageView *titleImageView = [[UIImageView alloc] initWithImage:titleImage];
self.navigationItem.titleView = titleImageView;
[titleImageView release];

我想将此块定义为宏，以后我可以说例如addImage（... ）;谢谢你的帮助。

I want to define this block as a macro so I can later say for instance addImage(...); Thanks for your help.

推荐答案

#define MY_MACRO( img ) \
    {\
        UIImage *titleImage = [UIImage imageNamed:img]; \
        UIImageView *titleImageView = [[UIImageView alloc] initWithImage:titleImage]; \
        self.navigationItem.titleView = titleImageView; \
        [titleImageView release];\
    }

使用它像这个：

MY_MACRO( @"myLogo.png" )

使用 {} 创建一个范围块，这将防止变量重定义出现问题（如果你有变量）使用宏的名称相同。

The use of {} creates a scope block, which will prevent problems with variable redefinitions (if you have variables with the same name, where you use the macro).

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