iphone - Why does the font of my UITextField change when editing? -

my uitextfield's font gets lighter when being edited, , bolder whenever editing finishes. these images should illustrate problem:

can explain why is, , how stop it?

this code i've got - first uitextfield subclass (which there add margins):

@interface rltextfield : uitextfield {     } @end  @implementation rltextfield  - (cgrect)editingrectforbounds:(cgrect)bounds {     cgrect editingrect = cgrectmake(bounds.origin.x+35, bounds.origin.y-5, bounds.size.width, bounds.size.height);     return editingrect; }  - (cgrect)textrectforbounds:(cgrect)bounds {     cgrect editingrect = cgrectmake(bounds.origin.x+35, bounds.origin.y-5, bounds.size.width, bounds.size.height);     return editingrect; } @end 

and it's added in viewcontroller:

- (void)viewdidload {        cgrect notetitletextframe  = cgrectmake(self.view.bounds.origin.x,                                              self.view.bounds.origin.y+10,                                              self.view.bounds.size.width,                                              44);     rltextfield *textfield = [[rltextfield alloc] initwithframe:notetitletextframe];     self.nametextfield = textfield; [textfield release];     self.nametextfield.delegate = self;     self.nametextfield.borderstyle = uitextborderstylenone;         self.nametextfield.contentverticalalignment = uicontrolcontentverticalalignmentbottom;     self.nametextfield.font = [uifont fontwithname:@"courier" size:21];     [self.view addsubview:self.nametextfield];  } 

checked code.... , there 1 word wtf....!
don't know what's wrong there solution , it's

self.nametextfield.font = [uifont fontwithname:@"courier new" size:21]; 

change font name. work.. cheers :)
way found bug or may not that's why apple has added "courier new".
don't know...