Provide a public way to detect the first responder

Number:rdar://20549460 Date Originated:15-Apr-2015 10:37 AM
Status:Open Resolved:
Product:iOS Product Version:8.3
Classification:Enhancement Reproducible:Always
This is a duplicate of rdar://20549403


In UIKit, unlike AppKit on the Mac, there’s currently no public way to detect the current first responder. Developers therefore need to resort to workarounds like 

AppKit already provides -[NSWindow  firstResponder], and I would like to request that an equivalent method is added to the public iOS API as well. 


A public first responder  API is still missing as of iOS 8.3.


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