Question

In the initialization method for a UIView subclass I am adding several UIImageViews. When the view is rendered they are present in the subviews array and have valid frame rects, but are not drawn on the screen. Does anyone know why this happens?

- (id) initWithFrame:(CGRect)frame {

    self = [super initWithFrame:frame];
    if (!self)
        return nil;

    [self commonInit];

    return self;

}

- (void) commonInit {

    _padding = 128.0f;

    // Add the chord views here


    _chordImages = [NSArray arrayWithObjects:[UIImage imageNamed:@"fn_maj_x_x_x_x_1_e_1_fn"], [UIImage imageNamed:@"en_maj_x_x_x_x_1_e_1_en"], [UIImage imageNamed:@"dn_maj_x_x_x_x_1_d_1_f#"], [UIImage imageNamed:@"an_min_x_x_x_x_1_a_1_en"], nil];

    CGFloat containerWidth = [self bounds].size.width;
    NSLog(@"containerWidth: %f",containerWidth);
    CGFloat chordWidth = [[_chordImages objectAtIndex:0] size].width;
    NSLog(@"chordWidth: %f",chordWidth);
    CGFloat chordMarkerWidth = [[[GVChordMarkerView alloc] initWithFrame:CGRectMake(0, 0, 12, 12)] frame].size.width;
    NSLog(@"chordMarkerWidth: %f",chordMarkerWidth);

//  [self setFrame:CGRectMake(chordXPosition, 0, [self bounds].size.width, [self bounds].size.height]);

    CGFloat chordXPosition = 0;
    CGFloat chordXSpacing = (containerWidth/4 - (chordMarkerWidth + chordWidth));
    chordXPosition += containerWidth/4;

    for (NSUInteger i = 0; i < [_chordImages count]; i++) {
        chordXPosition += chordXSpacing;
        CGRect chordImageViewFrame = CGRectMake(chordXPosition, 0, [[_chordImages objectAtIndex:0] size].width, [[_chordImages objectAtIndex:0] size].height);
        UIImageView *chordImageView = [[UIImageView alloc] initWithFrame:chordImageViewFrame];
        [self addSubview:chordImageView];
        chordXPosition += (chordMarkerWidth + chordWidth);
    }
    NSLog(@"Finished");
}

Answer 1

Could it be that your UIImageview is just empty? Where did you add the image?