我们如何以编程方式检测哪个iOS版本的设备正在运行？ [英] How can we programmatically detect which iOS version is device running on?

问题描述

我想检查用户是否在iOS上运行应用程序小于5.0，并在应用程序中显示标签。

如何检测哪个iOS正在运行

解决方案

最佳当前版本，而不需要处理NSString中的数字搜索是定义宏（请参阅原始答案：检查iPhone iOS版本）

github中存在这些宏，请参阅：https://github.com/carlj/CJAMacros/blob/master/CJAMacros/CJAMacros.h

像这样：

  #define SYSTEM_VERSION_EQUAL_TO（v）（[[[UIDevice currentDevice] systemVersion] compare：v选项：NSNumericSearch] == NSOrderedSame）
 #define SYSTEM_VERSION_GREATER_THAN（v）（[[[UIDevice currentDevice] systemVersion] compare：v options：NSNumericSearch] == NSOrderedDescending）
 #define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO （v）（[[UIDevice currentDevice] systemVersion]比较：v选项：NSNumericSearch]！= NSOrderedAscending）
 #define SYSTEM_VERSION_LESS_THAN（v） = NSOrderedAscending）
 #define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO（v）（[[[[UIDevice currentDevice] systemVersion] compare：v options：NSNumericSearch]！= NSOrderedDescending）
  

并使用它们：

  if（SYSTEM_VERSION_LESS_THAN（@ ））{
 // code here 
} 
 
 if（SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO（@6.0））{
 // code here 
} 
  

---

以下的旧版本

获取操作系统版本：

  [[UIDevice currentDevice] systemVersion] 
  

返回字符串，可通过

转换为int / float

   -  [NSString floatValue] 
  -  [NSString intValue] 
  

像这样

这两个值（floatValue，intValue）将被剥离，由于其类型，5.0.1将变为5.0或5 int），为了进行精确比较，您必须将其分隔为INT数组
检查接受的答案在这里：检查iPhone iOS版本

  NSString * ver = [[UIDevice currentDevice] systemVersion]; 
 int ver_int = [ver intValue]; 
 float ver_float = [ver floatValue]; 
  

并像这样比较

  NSLog（@系统版本为％@，[[UIDevice currentDevice] systemVersion]）; 
 NSString * ver = [[UIDevice currentDevice] systemVersion]; 
 float ver_float = [ver floatValue]; 
 if（ver_float< 5.0）return false; 
  

I want to check if the user is running the app on iOS less than 5.0 and display a label in the app.

How do I detect which iOS is running on user's device programmatically?

Thanks!

解决方案

Best current version, without need to deal with numeric search within NSString is to define macros (See original answer: Check iPhone iOS Version)

Those macros do exist in github, see: https://github.com/carlj/CJAMacros/blob/master/CJAMacros/CJAMacros.h

Like this:

#define SYSTEM_VERSION_EQUAL_TO(v)                  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v)              ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)

and use them like this:

if (SYSTEM_VERSION_LESS_THAN(@"5.0")) {
    // code here
}

if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"6.0")) {
    // code here
}

---

Outdated version below

to get OS version:

[[UIDevice currentDevice] systemVersion]

returns string, which can be turned into int/float via

-[NSString floatValue]
-[NSString intValue]

like this

Both values (floatValue, intValue) will be stripped due to its type, 5.0.1 will become 5.0 or 5 (float or int), for comparing precisely, you will have to separate it to array of INTs check accepted answer here: Check iPhone iOS Version

NSString *ver = [[UIDevice currentDevice] systemVersion];
int ver_int = [ver intValue];
float ver_float = [ver floatValue];

and compare like this

NSLog(@"System Version is %@",[[UIDevice currentDevice] systemVersion]);
NSString *ver = [[UIDevice currentDevice] systemVersion];
float ver_float = [ver floatValue];
if (ver_float < 5.0) return false;

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