Xcode iOS - Rotate/scale UIImageView with an "anchor" at top right? -

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i building image editing program places "stamps" on images.

i've added image views stamps photo , can re-position/scale/rotate these stamps (image views) using pinch gesture recognizers.

however when stamp gets small, becomes impossible fit 2 fingers on stamp resize or rotate.

i've noticed similar types of apps use sort of "anchor" or icon @ top-right corner of stamp's frame can drag 1 finger achieves same scale/rotate effect (as opposed using pinching gestures).

is there specific term "anchor" or term kind of scale/rotate procedure? i'm having trouble searching on particular kind of feature.

if might know of prebuilt classes or links pages describing how implement kind of feature, huge help!

i attaching animated gif illustrate trying implement.

thanks!

enter image description here

okay after posted question checked out of related questions , stumbled upon module called zdstickerview. after playing around think work application.

https://www.cocoacontrols.com/controls/zdstickerview


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