How to Change Font Size of Cell in uitableview

Another simple one:

cell.textLabel.font = [cell.textLabel.font fontWithSize:19];

this way you change only the font size mantaining all the font format.

UIFont *myFont = [ UIFont fontWithName: @"Arial" size: 18.0 ];
cell.textLabel.font  = myFont;

UIFont reference

Change font size and font family.

cell.textLabel.font=[UIFont fontWithName:@"Arial" size:16];

change font size

cell.textLabel.font=[UIFont systemFontOfSize:22.0];