When surfing the web in Safari, you can double-tap the status bar to quickly scroll back up to the top any webpage. In other iOS apps that have the shortcut enabled, you can get the job done even faster by tapping the status bar only once. The only bad thing about this feature is that there’s no shortcut for scrolling all of the way back down or to the middle.
Fortunately, there is a way to create your own shortcut gesture that will make reaching the middle and bottom of a page just as easy as reaching the top. For this to work, you will need to have a jailbroken iOS device.
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Sig Nordal 