objective c - iOS Custom UIButton not appearing on view -


i'm having issues overriding uibutton class , customising it.

i have block class uses uibutton class:

#import "block.h"  @implementation block  -(id)initwithwidth:(int)width withheight:(int)height withxpos:(double)x withypos:(double)y{     _width=width;     _height=height;     _x=x;     _y=y;     self = [super initwithframe:[self createrect]];     return self; }  - (cgrect)createrect{     cgrect background= cgrectmake(_x, _y, _width, _height);     cgcontextref context = uigraphicsgetcurrentcontext();     cgcontextsetrgbfillcolor(context, 1.0, 0.0, 0.0, 1.0);     cgcontextsetrgbstrokecolor(context, 1.0, 0.0, 0.0, 1.0);     cgcontextfillrect(context, background);     return background; }   @end

all i'm trying add instance of block class view:

#import "viewcontroller.h" #import "block.h"  @interface viewcontroller ()  @end  @implementation viewcontroller  - (void)viewdidload {     [super viewdidload];     block* b = [[block alloc]initwithwidth:200 withheight:200 withxpos:0 withypos:200];     [self.view addsubview:b];     // additional setup after loading view, typically nib. }  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }  @end

really confused why doesn't work!

thanks in advance.

where call createrect? not uiview method , never called on own. did mean use drawrect: instead?

also, there reason made custom initializer , didn't override initwithframe:? seemingly accomplishing same thing in needlessly complicated way.

edit: see happening now. calling when calling super initializer. have tried converting drawrect: instead? attempting perform drawing before view on screen.

here example should work fine:

#import "block.h"  @implementation block  -(id)initwithframe:(cgrect)frame {     if(self = [super initwithframe:frame])     {         // put customization here, although example doesn't require     }     return self; }  -(void)drawrect:(cgrect)rect {     [super drawrect:rect];     cgcontextref context = uigraphicsgetcurrentcontext();     cgcontextsetrgbfillcolor(context, 1.0, 0.0, 0.0, 1.0);     cgcontextsetrgbstrokecolor(context, 1.0, 0.0, 0.0, 1.0);     cgcontextfillrect(context, rect); }  @end

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