ios - How to change the position of the button through coding xcode -

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i trying align button created through code, can't seem change position, code:

- (id)initwithframe:(cgrect)frame {     self = [super initwithframe:frame];     if (self) {         self.backgroundcolor = [uicolor whitecolor];         self.linewidth = default_width;         self.linecolor = default_color;         uibutton* btn = [uibutton buttonwithtype:uibuttontyperoundedrect];         btn.frame = cgrectmake(20,100, 50, 50);         //[btn setframe:cgrectmake(3,20, 50, 50)];         btn.center = self.center;          [btn settitle:@"clear" forstate:uicontrolstatenormal];         [btn addtarget: self                     action: @selector(clearbuttonpressed:)           forcontrolevents: uicontroleventtouchdown];         [self addsubview:btn];     }     return self; }

if remove "btn.center =self.center" , try set x , y position as

    "btn.frame =cgrectmake(3,20,50,50)"

it doesn't display button. please appreciated , in advance!

have tried using [btn setcenter:center]; center cgpoint?


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