I want use function 'dlopen()' to invoke a dynamic library on iOS platform, is the function 'dlopen()' private API?
I've had success using dlopen on iOS for years. In my use case, I use dlopen to load public system frameworks on demand instead of having them loaded on app launch. Works great!
[EDIT] - as of iOS 8, extensions and shared frameworks are prohibited from using dlopen
, however the application itself can still use dlopen
(and is now documented as being supported for not only Apple frameworks, but custom frameworks too). See the Deploying a Containing App to Older Versions of iOS section in this Apple doc.
[EDIT] - contrived example
#import <dlfcn.h>
void printApplicationState()
{
Class UIApplicationClass = NSClassFromString(@"UIApplication");
if (Nil == UIApplicationClass) {
void *handle = dlopen("System/Library/Frameworks/UIKit.framework/UIKit", RTLD_NOW);
if (handle) {
UIApplicationClass = NSClassFromString(@"UIApplication");
assert(UIApplicationClass != Nil);
NSInteger applicationState = [UIApplicationClass applicationState];
printf("app state: %ti\n", applicationState);
if (0 != dlclose(handle)) {
printf("dlclose failed! %s\n", dlerror());
}
} else {
printf("dlopen failed! %s\n", dlerror());
}
} else {
printf("app state: %ti\n", [UIApplicationClass applicationState]);
}
}