本文主要是介绍iOS开发之不得不会的gdb命令,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
http://blog.csdn.net/mars2639/article/details/7589802
更新说明:后面发现这篇文章介绍的比较全面 http://blog.csdn.net/ch_soft/article/details/6740000
文章转载于:http://www.ethangao.com/?p=273,谢谢作者分享。
gdb不是万能的,可是没有gdb却是万万不能的。这里给大家简单介绍下iOS开发中最基本的gdb命令。
po
po是print-object的简写,可用来打印所有NSObject对象。使用举例如下:
(gdb) po self
<LauncherViewController: 0x552c570>
(gdb) po [self view]
<UIView: 0x544eb80; frame = (0 0; 320 411); autoresize = W+H; layer = <CALayer: 0x544ebb0>>
(gdb) print-object [self view]
<UIView: 0x544eb80; frame = (0 0; 320 411); autoresize = W+H; layer = <CALayer: 0x544ebb0>>
p
p是print的简写,可以用来打印所有的简单类型,如int, float,结构体等。使用举例如下:
(gdb) p self
$1 = (LauncherViewController *) 0x552c570
(gdb) p [[self view] size]
Unable to call function “objc_msgSend” at 0x1e7e08c: no return type information available.
To call this function anyway, you can cast the return type explicitly (e.g. ‘print (float) fabs (3.0)’)
(gdb) p (CGSize)[[self view] size]
$1 = {
width = 320,
height = 411
}
(gdb) print (CGSize)[[self view] size]
$2 = {
width = 320,
height = 411
}
call
call即是调用的意思。其实上述的po和p也有调用的功能。因此一般只在不需要显示输出,或是方法无返回值时使用call。使用举例如下:
(gdb) call [[self view]sizeToFit]
Unable to call function “objc_msgSend” at 0x1e7e08c: no return type information available.
To call this function anyway, you can cast the return type explicitly (e.g. ‘print (float) fabs (3.0)’)
(gdb) call (void)[[self view]sizeToFit]
(gdb) call [[self view] size]
Unable to call function “objc_msgSend” at 0x1e7e08c: no return type information available.
To call this function anyway, you can cast the return type explicitly (e.g. ‘print (float) fabs (3.0)’)
(gdb) call (void)[[self view] size]
这篇关于iOS开发之不得不会的gdb命令的文章就介绍到这儿,希望我们推荐的文章对编程师们有所帮助!