Position UILabel in circle - iphone

Question

I want to position a UILabel in the center of my Circle but I can't seem to affect the position of the label. I can only seem to affect the position of the label by changing the height of CGRect frame. changing the other values doesn't affect the position at all.
here's my Circle.m code
- (id)initWithFrame:(CGRect)frame radius:(CGFloat)aRadius color:(UIColor*) aColor {
self = [super initWithFrame:frame];
if (self) {
self.opaque = NO;
[self setRadius:aRadius];
[self setColor:aColor];
}
return self;
}
- (void)drawRect:(CGRect)rect
{
NSString *string = #"1";
UIFont* font = [UIFont systemFontOfSize:80];
UILabel *label = [[UILabel alloc] init];
label.text = string;
label.textColor = [UIColor whiteColor];
label.font = font;
CGRect frame = label.frame;
frame = CGRectMake(10, 10, 0, 85);
label.frame = frame;
CGContextRef contextRef = UIGraphicsGetCurrentContext();
[color setFill];
circle = CGRectMake(0, 0, radius, radius);
CGContextAddEllipseInRect(contextRef, circle);
CGContextDrawPath (contextRef, kCGPathFill);
[label drawRect:circle];
}
and my viewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
CGFloat radius = 70;
CGRect position = CGRectMake(0, 0, radius, radius);
Circle *myCircle = [[Circle alloc] initWithFrame:position radius:radius color:[UIColor redColor]];
[self.view addSubview:myCircle];
}

Answer 1

You should not be allocating new UIViews in drawRect: (and UILabel is a subclass of UIView). There are a few good ways of doing what you want, but none of them involve allocating a new UILabel in drawRect:.
One way is to make your Circle give itself a UILabel subview in its initializer, and center the label in layoutSubviews. Then in drawRect:, you just draw the circle and don't worry about drawing the label's text:
#implementation Circle {
UILabel *_label;
}
#synthesize radius = _radius;
#synthesize color = _color;
- (id)initWithFrame:(CGRect)frame radius:(CGFloat)aRadius color:(UIColor*) aColor {
self = [super initWithFrame:frame];
if (self) {
self.opaque = NO;
[self setRadius:aRadius];
[self setColor:aColor];
_label = [[UILabel alloc] init];
_label.font = [UIFont systemFontOfSize:80];
_label.textColor = [UIColor whiteColor];
_label.text = #"1";
[_label sizeToFit];
[self addSubview:_label];
}
return self;
}
- (void)layoutSubviews {
[super layoutSubviews];
CGSize mySize = self.bounds.size;
_label.center = CGPointMake(mySize.width * 0.5f, mySize.height * 0.5f);
}
- (void)drawRect:(CGRect)rect {
[self.color setFill];
CGSize mySize = self.bounds.size;
CGFloat radius = self.radius;
[[UIBezierPath bezierPathWithOvalInRect:CGRectMake(mySize.width * 0.5f, mySize.height * 0.5f, self.radius, self.radius)] fill];
}