objc.py 文件源码

def _load_or_error(name):
    path = util.find_library(name)
    if path is not None:
        return CDLL(path)

    # On iOS (and probably also watchOS and tvOS), ctypes.util.find_library doesn't work and always returns None.
    # This is because the sandbox hides all system libraries from the filesystem and pretends they don't exist.
    # However they can still be loaded if the path is known, so we try to load the library from a few known locations.

    for loc in _lib_path:
        try:
            return CDLL(os.path.join(loc, "lib" + name + ".dylib"))
        except OSError:
            pass

    for loc in _framework_path:
        try:
            return CDLL(os.path.join(loc, name + ".framework", name))
        except OSError:
            pass

    raise ValueError("Library {!r} not found".format(name))