Mac OS X Mountain Lion+, iPhoto 11+ and iOS 6+ includes feature of Photo Stream, which means you can automatically send a stream of photos taken on your iPhone, iPod Touch or iPad to your Mac screen saver or to Apple TV when connected to Wi-Fi.
So, check out the guide below which gives you opportunity to learn that how you can use Photo streaming on Apple devices.
Note: Before proceeding you must remember that Photo Stream feature just works if you have set up iCloud on all or your Apple devices.
Stream Photos from iPhone to Mac Screen Saver
Turn ON Photo Stream in iOS
From Spring board of your iDevice, tap on “Settings” > “iCloud” and toggle the ON/OFF slider followed by “My Photo Stream” to ON state
Enable Photo Stream on Mac in iPhoto
Open iPhoto on Mac, from the left menu click “Photo Stream” and in right panel click “Turn on Photo Stream” button. In result iPhoto will start picking stream of photos taken on iDevice to your Mac
Note:iPhoto will import photos from iDevice until Photo Stream feature is enabled only.
Set Photo Stream to Work as Screen Saver on Mac
Click on “Apple” menu > “System Preferences”
Under “Personal” section, click on “Desktop & Screen Saver” and select “Screen Saver” tab
From left panel choose a slideshow style. In the right panel click “Source” button and chose your photo stream to set as screen saver from the available list of options