UIView subclass is not visible - iphone

Question

I'm a creating a subclass of UIView (MultiColumnTableView) which will hold a couple of table views. However, when I add my custom view as a subview to the view controller it is never visible, and I really can't figure out why?
I'm adding it with this code in my root view controller:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
_multiColumnTableView = [[MultiColumnTableView alloc] initWithNumberOfColums:3 columnWidth:200 frame:CGRectMake(100, 100, 0, 400)];
_multiColumnTableView.dataSource = self;
_multiColumnTableView.delegate = self;
[self.view addSubview:_multiColumnTableView];
[_multiColumnTableView reloadData];
}
The custom class initializer contains the following code:
- (id)initWithNumberOfColums:(NSInteger)columns columnWidth:(float)width frame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.numberOfColumns = columns;
self.columnWidth = columnWidth;
self.bounds = CGRectMake(0, 0, columnWidth * numberOfColumns, self.bounds.size.height);
_tableViews = [NSMutableArray new];
// Create all the desired colums (= tableViews)
for (int i = 0; i < numberOfColumns; i++) {
UITableView *t = [[UITableView alloc] initWithFrame:CGRectMake(columnWidth * i, 0, columnWidth, self.bounds.size.height)];
[_tableViews addObject:t];
t.tag = i;
t.backgroundColor = [UIColor blueColor];
t.dataSource = self;
t.delegate = self;
[self addSubview:t];
}
}
return self;
}
I'm expecting to see some blue table views, but they are not visible, and therefore they never call cellForRowAtIndexPath:, but they do call numberOfRowsInSection. My custom subview is added to the root view. When counting the subviews it returns 1. Can anyone see the problem?

Answer 1

check each frame of tableviews is properly assigned.

Answer 2

do following changes inside constructor.
- (id)initWithNumberOfColums:(NSInteger)columns columnWidth:(float)width frame:(CGRect)frame
{
self = [super initWithFrame:CGRectMake(frame.origin.x, frame.origin.y, columns*width, frame.size.height)];
if (self) {
self.numberOfColumns = columns;
self.columnWidth = columnWidth;
_tableViews = [NSMutableArray new];
// Create all the desired colums (= tableViews)
for (int i = 0; i < numberOfColumns; i++) {
UITableView *t = [[UITableView alloc] initWithFrame:CGRectMake(columnWidth * i, 0, columnWidth, frame.size.height)];
[_tableViews addObject:t];
t.tag = i;
t.backgroundColor = [UIColor blueColor];
t.dataSource = self;
t.delegate = self;
[self addSubview:t];
}
}
return self;
}