Use Share Sheets
Share sheets make it easy to transfer something on your device (like a PDF displayed in Safari) to another app (like Books), or send something on your device somewhere else (like sharing a link to a webpage with Messages or on Twitter). Share sheets often hide other functionality that doesn’t fit anywhere else—see Share Sheet Tricks later in the chapter. Here are the ins and outs of how Share Sheets work in iOS.
Share with Share Sheets
Whenever you can share content, you see a Share 
icon. Tap it to reveal the Share sheet, which displays two rows of buttons. Swipe left and right on each half to reveal more functionality. Tap ...
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