cocoa touch - iOS: Issue modifying button's color -

i have following code in .h file:

#import <uikit/uikit.h> @interface scloginviewcontroller : uiviewcontroller @property (weak, nonatomic) iboutlet uibutton *btnlogin; @end 

and following code in .m file:

- (void)viewdidappear:(bool)animated {      [super viewdidappear:animated];      // additional setup after loading view nib.     // add gradient buttons      btnlogin.layer.cornerradius = 10;      cagradientlayer *gradientlayer = [cagradientlayer layer];     gradientlayer.frame = btnlogin.layer.bounds;      gradientlayer.colors = [nsarray arraywithobjects:                             (id)[uicolor colorwithwhite:1.0f alpha:0.1f].cgcolor,                             (id)[uicolor colorwithwhite:0.4f alpha:0.5f].cgcolor,                             nil];      gradientlayer.cornerradius = btnlogin.layer.cornerradius;     [btnlogin.layer addsublayer:gradientlayer];      // add shadow     btnlogin.layer.shadowcolor = [uicolor darkgraycolor].cgcolor;     btnlogin.layer.shadowopacity = 1.0;     btnlogin.layer.shadowoffset = cgsizemake(2.0, 2.0); } 

this how button sits on screen:

something horribly wrong though. know missing simple, can't figure out. created regular outlet called btnlogin change try make not working. button rounded rect button. tried custom button , didn't help.

thank you!

from image, see did not make connection btnlogin on nib file file's owner - .h file. line below has no connection button trying make changes.

@property (weak, nonatomic) iboutlet uibutton *btnlogin; 

once make proper connection, should show btnlogin name referencing outlets on image provided.