Singleton had checked into a hospital after experiencing leg pain, sources told Variety.
TMZ reports that the stroke was "mild" and that doctors are now performing tests.
He has been hospitalized, and his family, in a statement, said he is receiving "great medical care".
Cristiano Ronaldo Could Leave Juventus Early
According to reports, Ronaldo was fuming in the aftermath of Juve's meek surrender to Ajax and demanded a transfer. Allegri believes that despite Ronaldo's arrival, there is no guarantee of winning the Champions League .
"Singleton's family issued a statement that said in part that they "... appreciate all of the prayers that have been pouring in from his fans, friends, and colleagues".
Celebrities responded on social media by posting messages of support for the two-time Oscar nominee.
Actress Nia Long, who featured in his classic film Boyz n the Hood, also shared a picture of Singleton on Twitter and wrote, "Praying hard this morning for my friend @johnsingleton PULL THROUGH BABY (sic)".
Two hopping Easter egg hunts get underway Friday
Thanks to Midwest Medair, the Easter bunny made a grand entrance to the Easter egg hunt at Hawthorne Elementary School. Some lucky kids found a prize ticket among their plastic eggs that entitled them to a large chocolate bunny.
Rapper Snoop Dogg posted an image of himself and Singleton on Instagram saying, "Pray 6 my brother".
Author Neil deGrasse Tyson and actor Omar Epps have been among those tweeting wishes Saturday for a quick recovery.
Singleton was nominated for best director and best screenplay for "Boys n the Hood", which was released in 1991. He's still the youngest filmmaker to get nominations in the two categories.
Plenty of showers today, dry on Easter
More rain is expected on Monday , which will be our coolest day with highs only in the high 40s to near 50 degrees in the city. It comes after temperatures in Britain reached 25C (77F) on Good Friday , with temperatures likely to hit 27C on Monday .