Set Dynamic UILable Size In Ios Iphone

CGSize maximumLabelSize = CGSizeMake(296,9999);

CGSize expectedLabelSize = [yourString sizeWithFont:yourLabel.font
                        constrainedToSize:maximumLabelSize
                        lineBreakMode:yourLabel.lineBreakMode];

//adjust the label the the new height.
CGRect newFrame = yourLabel.frame;
newFrame.size.height = expectedLabelSize.height;
yourLabel.frame = newFrame;