Use AutoLayout layout view to modify the frame solution in your code

You set the constraint for Aview using AutoLayout in Xib or storyboard, but you want Aview to make a simple animation, such as a simple animation that moves from the constrained a position (0,0,100,100) to the B position (0,66,100,100).

Then you'll find that if you set a constraint in Xib or storyboard, it doesn't work to modify the Aview frame directly in the code.

The result is no problem on the iOS7, but found on the iOS8 Aview moved from a to B, but returned a (the exact difference has not been found)

Solution:

Loginviewtopconstraint = [Nslayoutconstraint constraintWithItem:self.loginView attribute:nslayoutattributetop Relatedby:nslayoutrelationequal ToItem:self.view attribute:nslayoutattributetop multiplier:1.0 constant:66]; Defining New constraints

[Self.view removeconstraint:self.topconstraint];//Remove old constraint

[Self.view addconstraint:loginviewtopconstraint];//Add new constraint

[Self.view layoutifneeded];//makes the constraint effective

Use AutoLayout layout view to modify the frame solution in your code