Equivalent of or alternative to CGPathApply in Swift?

Question

In the pre-release documentation there appears to be no Swift version of CGPathApply. Is there an equivalent or alternative? I\'m trying to get all subpaths of a CGPath so t

Answer 1

Dmitry Rodionov has produced a function for converting a Swift function to a CFunctionPointer (see https://github.com/rodionovd/SWRoute/wiki/Function-hooking-in-Swift).

#define kObjectFieldOffset sizeof(uintptr_t)

struct swift_func_object {
    uintptr_t *original_type_ptr;
#if defined(__x86_64__)
    uintptr_t *unknown0;
#else
    uintptr_t *unknown0, *unknown1;
#endif
    uintptr_t function_address;
    uintptr_t *self;
};


uintptr_t _rd_get_func_impl(void *func)
{
    struct swift_func_object *obj = (struct swift_func_object *)*(uintptr_t *)(func + kObjectFieldOffset);
    
    //printf("-->Address of C-Func %lx unk=%lx ori=%lx<--\n", obj->function_address, obj->unknown0, obj->original_type_ptr);
    return obj->function_address;
}

I am using this successfully with CGPathApply along with a Swift callback function. (code at http://parker-liddle.org/CGPathApply/CGPathApply.zip) Although as Dmitry says this is a reverse engineered function and not a supported one.