Probably less of them than under Trump but there were kids in cages and kids separated from their families under Obama.
Those photos of immigrant children “caged” by the US? They’re from 2014
"Immigrant girls sleep in a cell, Jun. 18, 2014."
Also, here's a pbs article from 2016 with the same image:
Update, June 18: Since this story was published, new photos have been released by the US Customs and Border Protection, revealing current detainment conditions for immigrants apprehended at the border. The current conditions closely resemble the Obama-era “cages” depicted in photos from 2014. In both cases, children are shown separated from their families, sleeping on the floor within steel-wire enclosures.
33,000 complaints between 2010 and 2016 alleging a wide range of abuses in immigration detention.
sexual assault and harassment in immigration detention are not only widespread but systemic
In 2014, the Mexican American Legal Defense and Educational Fund filed a complaint reporting widespread allegations of sexual harassment at the Karnes County Residential Center, also in Texas, where more than 500 women were detained with their children.
In 2014, amid an influx of asylum seekers from Central America, the administration established large family detention centers to hold parents and children — potentially indefinitely — as a means of deterring other asylees.
Immigration experts we spoke to said Obama-era policies did lead to some family separations
some children were separated from their parents under Obama, this was relatively rare, and occurred at a far lower rate than under Trump
Trump correctly tweets that Democrats mistakenly tweeted photo of child migrants being held in 2014
To address a point that came up in the comments.
Were illegal immigrants without criminal records for anything else arrested under obama:
Over the first full 14 months of the Trump administration, 69% of undocumented immigrants arrested by Immigration and Customs Enforcement (ICE) agents had a criminal record. Over the final two years of the Obama administration, that number was 86%.
ICE agents have arrested an average of 4,143 undocumented immigrants without a criminal record each month under the Trump administration. In the final two years under Obama, the agents averaged 1,703 a month.
Those numbers show the radical change in immigration enforcement implemented by President Trump, who issued new directives to ICE shortly after taking office in January 2017.
ICE arresting more non-criminal undocumented immigrants
So 14% of immigrants arrested by Immigration and Customs Enforcement under Obama didn't have a criminal record other than that related to immigrating illegally.