[英]How to determine the current iPhone OS version at runtime and compare version strings?
How can you determine and compare (>, <, etc.) the current OS version of the iPhone that the app is running on? 如何确定和比较(>,<等等)运行该应用程序的iPhone的当前操作系统版本? There is a certain bug in 3.0 but not in 3.1+ so I'd like to be able to skip out a bit of code if the current OS version is not >= 3.1.
3.0中有一个错误,但3.1+中没有,所以如果当前操作系统版本不是> = 3.1,我希望能够跳过一些代码。
This needs to be at runtime not compile time! 这需要在运行时而不是编译时!
You can for instance do something like this: 例如,您可以执行以下操作:
NSString *reqSysVer = @"3.1";
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending)
{
//Do some clever stuff
}
Do you mean determine the version of the OS? 你的意思是确定操作系统的版本? The SDK is fixed at build time, but the OS may change.
SDK在构建时修复,但操作系统可能会更改。 To get the OS version, use [UIDevice currentDevice].
要获取操作系统版本,请使用[UIDevice currentDevice]。 systemVersion.
systemVersion。 To get the SDK version, I think you can use __IPHONE_OS_VERSION_MIN_REQUIRED.
要获得SDK版本,我认为您可以使用__IPHONE_OS_VERSION_MIN_REQUIRED。
A more reliable way is to do something like this: 更可靠的方法是做这样的事情:
static inline NSComparisonResult compareCurVersionTo(int major, int minor, int point)
{
NSUInteger testVers = major*10000 + minor*100 + point;
NSUInteger curSysNum = 0;
NSUInteger multi = 10000;
for(NSString *n in [[[UIDevice currentDevice] systemVersion] componentsSeparatedByString:@"."]) {
curSysNum += [n integerValue] * multi;
multi /= 100;
}
if(curSysNum < testVers) return NSOrderedAscending;
if(curSysNum > testVers) return NSOrderedDescending;
return NSOrderedSame;
}
This handles the "Leopard" bug where the minor releases were more than "9". 这处理“Leopard”错误,其中次要版本超过“9”。
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