如何在OS X或iOS（不使用Gestalt）的运行时确定操作系统版本？

问题描述：

位于 CarbonCore / OSUtils.h 中的Gestalt（）函数已被弃用于OS X 10.8 Mountain Lion。

The Gestalt() function located in CarbonCore/OSUtils.h has been deprecated as of OS X 10.8 Mountain Lion.

我经常使用这个函数在运行时测试OS X操作系统的版本（见下面的玩具示例）。

I often use this function to test the version of the OS X operating system at runtime (see the toy example below).

还可以使用其他的API在Cocoa应用程序中检查OS X操作系统版本？

What other API could be used to check the OS X operating system version at runtime in a Cocoa application?

int main() {
    SInt32 versMaj, versMin, versBugFix;
    Gestalt(gestaltSystemVersionMajor, &versMaj);
    Gestalt(gestaltSystemVersionMinor, &versMin);
    Gestalt(gestaltSystemVersionBugFix, &versBugFix);

    printf("OS X Version: %d.%d.%d\n", versMaj, versMin, versBugFix);
}

答

在OS X 10.10 iOS 8.0），您可以使用 [[NSProcessInfo processInfo] operatingSystemVersion] ，它返回一个 NSOperatingSystemVersion struct， p>

On OS X 10.10 (and iOS 8.0), you can use [[NSProcessInfo processInfo] operatingSystemVersion] which returns a NSOperatingSystemVersion struct, defined as

typedef struct {
    NSInteger majorVersion;
    NSInteger minorVersion;
    NSInteger patchVersion;
} NSOperatingSystemVersion;

在NSProcessInfo中还有一个方法来比较：

There is also a method in NSProcessInfo that will do the comparison for you:

- (BOOL)isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion)version

谨慎，虽然记录在OS X 10.10及更高版本中， operatingSystemVersion 和 isOperatingSystemAtLeastVersion：存在于OS X 10.9（可能为10.9.2 ），并按预期工作。这意味着您不必测试 NSProcessInfo 是否响应这些选择器，以检查您是否在OS X 10.9或10.10上运行。

Beware, although documented to be available in OS X 10.10 and later, both operatingSystemVersion and isOperatingSystemAtLeastVersion: exist on OS X 10.9 (probably 10.9.2) and work as expected. It means that you must not test if NSProcessInfo responds to these selectors to check if you are running on OS X 10.9 or 10.10.

在iOS上，这些方法仅在iOS 8.0后才有效。

On iOS, these methods are effectively only available since iOS 8.0.

如何在OS X或iOS（不使用Gestalt）的运行时确定操作系统版本？

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