iOS Custom UIButton not appearing on view - ios

Question

I'm having issues with overriding the UIButton class and customising it.
I have a block class which uses the 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 to do is then add an instance of the Block class to my 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];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Really confused as to why this doesn't work!
Thanks in advance.

Answer 1

Where do you call createRect? That is not a UIView method and will never get called on its own. Did you mean to use drawRect: instead?
Also, is there a reason you made a custom initializer and didn't just override initWithFrame:? You are seemingly accomplishing the same thing in a needlessly complicated way.
EDIT: I see what is happening now. You are calling it when calling the super initializer. Have you tried converting it to drawRect: Instead? As it is now you are attempting to perform drawing before the view is even on the screen.
Here is an example that should work just fine:
#import "Block.h"
#implementation Block
-(id)initWithFrame:(CGRect)frame
{
if(self = [super initWithFrame:frame])
{
// put any extra customization here, although your example doesn't require any
}
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