用于版本控制的 #ifdef 宏

发布于 2024-09-12 09:59:58 字数 862 浏览 3 评论 0原文

我使用宏来区分版本，但我不能强迫它正常工作。我使用：

#ifdef _IPHONE_4_0
  [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
 #else
  [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];
 #endif

and

#if __IPHONE_OS_VERSION_MAX_ALLOWED < _IPHONE_4_0
  [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];
 #else
  [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
 #endif

and

#if defined(__IPHONE_4_0)
  [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
 #else
  [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];
 #endif

无论我使用什么版本 - 总是只调用其中一行。并且 __IPHONE_4_0 始终被定义。有什么想法吗？

原文

I use macros to differ the versions but I can't force it to work properly. I used:

#ifdef _IPHONE_4_0
  [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
 #else
  [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];
 #endif

and

#if __IPHONE_OS_VERSION_MAX_ALLOWED < _IPHONE_4_0
  [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];
 #else
  [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
 #endif

and

#if defined(__IPHONE_4_0)
  [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
 #else
  [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];
 #endif

No matter what version I use - always called only one of the lines. And the __IPHONE_4_0 is always defined. Any ideas?

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暮凉 2024-09-19 09:59:59

#if... 处理器指令在编译时解析。只要您针对 4.0 SDK 进行编译，则始终会选择 4.0 变体。

如果您想让该应用程序适用于 < 4.0，您应该使用运行时检查：

UIApplication* app = [UIApplication sharedApplication];
if ([app respondsToSelector:@selector(setStatusBarHidden:withAnimation:)])
  [app setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
else
  [app setStatusBarHidden:YES animated:YES];

The #if… processor directives are resolved at compile time. As long as you compile for the 4.0 SDK, the 4.0 variant will always be chosen.

If you intend to make the app works for < 4.0, you should use a runtime check:

UIApplication* app = [UIApplication sharedApplication];
if ([app respondsToSelector:@selector(setStatusBarHidden:withAnimation:)])
  [app setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
else
  [app setStatusBarHidden:YES animated:YES];

回复收藏 0 原文

初见终念 2024-09-19 09:59:59

一个小变化 -

以下代码应该可以工作：

 #if __IPHONE_OS_VERSION_MAX_ALLOWED < __IPHONE_4_0   
       [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES]; 
 #else   
       [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
 #endif

请注意它是 __IPHONE_4_0 而不是 _IPHONE_4_0

A small change -

The following code should work:

 #if __IPHONE_OS_VERSION_MAX_ALLOWED < __IPHONE_4_0   
       [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES]; 
 #else   
       [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
 #endif

Plz note it's __IPHONE_4_0 not _IPHONE_4_0

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