iOS subview displayed as a black rectangle if drawRect is overwritten - objective-c

Question

I have a storyboard which loads loads a custom UIView. Also a sub view is added to the view in the storyboard. It worked fine until I overwrote the drawRect method of the sub view, then I just saw a black rectangle instead of the subview. Here is the code:
#import <UIKit/UIKit.h>
#import "MySubview.h"
#interface MyView : UIView
#end
#import "MyView.h"
#implementation MyView
- (void) awakeFromNib
{
CGRect frame = [self frame];
MySubview* sv = [[MySubview alloc] initWithFrame:frame];
[self addSubview:sv];
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
#end
#import <UIKit/UIKit.h>
#interface MySubview : UIView
#property (retain, nonatomic) NSString* text;
#property (retain, nonatomic) UILabel* label;
#end
#import "MySubview.h"
#implementation MySubview
#synthesize text, label;
- (void)attachLabel
{
text = #"Hello";
label = [[UILabel alloc] init];
[label setText:text];
[label setFont:[UIFont fontWithName:#"Futura" size:18]];
[label setBackgroundColor:[UIColor clearColor]];
[label sizeToFit];
CGRect labelFrame = label.frame;
labelFrame.origin.x = (self.frame.size.width - labelFrame.size.width) / 2;
labelFrame.origin.y = (self.frame.size.height - labelFrame.size.height) / 2;
label.frame = labelFrame;
[self addSubview:label];
}
- (void)awakeFromNib
{
[self attachLabel];
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self attachLabel];
}
return self;
}
// Works if I comment this out!
- (void)drawRect:(CGRect)rect
{
}
#end
Update - Added drawing code below:
- (void)drawRectWithRoundBorders:(CGRect)rect
{
[super drawRect:rect];
// Parameters used for drawing.
const CGFloat lineWidth = 5;
const CGFloat shadowOffset = 3;
const CGFloat shadowBlur = 4;
const CGFloat spaceToBB = 10; // Space to the bounding box of this view.
const CGFloat cornerRadii = 5;
const CGFloat lineColor[4] = { 0, 0, 0, 1 };
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(ctx, lineWidth);
CGContextSetStrokeColor(ctx, lineColor);
CGContextSetShadow(ctx, CGSizeMake(shadowOffset, shadowOffset), shadowBlur);
CGRect innerRect = rect;
innerRect.size.width -= 2*spaceToBB;
innerRect.size.height -= 2*spaceToBB;
innerRect.origin.x += spaceToBB;
innerRect.origin.y += spaceToBB;
UIBezierPath *path =
[UIBezierPath bezierPathWithRoundedRect:innerRect
byRoundingCorners:UIRectCornerAllCorners
cornerRadii:CGSizeMake(cornerRadii, cornerRadii)
];
CGContextAddPath(ctx, path.CGPath);
CGContextStrokePath(ctx);
}
- (void)drawRect:(CGRect)rect
{
[self drawRectWithRoundBorders:rect];
}
Update
It seems to work when I fill the bounding box of the sub view with some color first.
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGFloat white[] = {1, 1, 1, 0.5};
CGContextSetFillColor(ctx, white);
CGContextAddRect(ctx, rect);
CGContextFillPath(ctx);

Answer 1

Just add [self setOpaque:NO] in your initWithFrame: method.

Answer 2

That's because your drawRect is doing nothing. You override drawRect if you want to do custom drawing. So:
If you don't want to do custom drawing then don't override drawRect.
If you do want to do custom drawing then actually do something in drawRect.