从imp调用Objective-C方法

#import<Foundation/Foundation.h>
#import <objc/runtime.h>

@interface MyClass : NSObject
- (void)myMethod;
@end

@implementation MyClass
- (void)myMethod {
    NSLog(@"myMethod called");
}
@end

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        MyClass *obj = [[MyClass alloc] init];
        Method method = class_getInstanceMethod([MyClass class], @selector(myMethod));
        IMP imp = method_getImplementation(method);
        void (*func)(id, SEL) = (void *)imp;
        func(obj, @selector(myMethod));
    }
    return 0;
}