如何检查CLLocationCoordinate2DIsValid是否可用？

i'd like to use the CLLocationCoordinate2DIsValid - check, which is available in iOS 4.0 and later.

我想使用CLLocationCoordinate2DIsValid - check，它在iOS 4.0及更高版本中可用。

how can i prevent this from being called on a iOS 3 device (it wil crash...)?

如何防止在iOS 3设备上调用它（它会崩溃......）？

i tried with:

我尝试过：

if (CLLocationCoordinate2DIsValid != NULL) {
  //use the check
} else {
  //do a own check
}

why do iOS3 devices try to "use the check" instead of "do a own check"? how would one call the CLLocationCoordinate2DIsValid properly - and only if it's available on the current iOS running?

为什么iOS3设备试图“使用支票”而不是“自己检查”？如何正确调用CLLocationCoordinate2DIsValid - 并且只有当它在当前运行的iOS上可用时？

1 个解决方案

#1

Your syntax isn't quite right for the dynamic loader. I asked the same question.

您的语法不适合动态加载器。我问了同样的问题。