Yup I know what you're talkin' about. A few of mine did that last year, and I had to saturate the flower bed with WATER every day for about a week. If iris leaves get to the point where their leaves turn brown, sometimes, if you gently pull the brown leaves off, there are new leaves underneath the dead ones. My stepmother has a patch where she left irises abandoned for a few years, and now there are dozens of clumps. But most of them don't have brown leaves, cuz I've been weeding and helped water them too. Most of the irises in that patch are those common purple ones and yellow ones. The others are newer ones. I also heard from my dad that after about a month, when you transplant or plant irises, they don't need much water. And If their leaves turn brown, don't worry, the iris leaves will come back fresh and new next spring with lots of blooms
Unless you transplanted them and didn't water them. Then they probably wont grow back.