Use iTunes or FonePaw iOS Transfer. Connect the iPhone to your Mac using the USB cable that came with it. Select your iPhone from the Devices menu and then click the "Photos" tab. Click the "Sync Photos From" check box. Select "Choose Folder" in the menu if the photos you want to transfer are in a specific folder on the Mac and then select that folder. Then select "iPhoto" from the menu if the photos you want to copy are in iPhoto. You can then specify if you want to copy all the photos from iPhoto or specific photos in an iPhoto album, event or specific faces of people in all the iPhoto albums. Click "Apply".