UIScrollView中的自定义UIView从未调用过drawRect

Question

I have in a controller:

- (void)viewDidLoad {
   [super viewDidLoad];

   // Add a scroolView
   self.scroolViewDay.scrollEnabled = YES;
   // Compute the content Size of the TableDays
   self.scroolViewDay.contentSize = CGSizeMake(self.scroolViewDay.frame.size.width, 
                                               80 * 48); // TO MODIFY!
   [self.scroolViewDay addSubview:self.tableDays];
   [self.tableDays setNeedsDisplay];
}

The controller has a XIB where the UIScrollView is into. The custom view TableDays has a custom drawRect which is never called:

- (void)drawRect:(CGRect)rect {
    NSLog(@"sono in drawRect");
}

Why?

Answer 1

-(void) setNeedsDisplay {
    [self.subviews makeObjectsPerformSelector:@selector(setNeedsDisplay)];
    [super setNeedsDisplay];
}

Add this code, and just override setNeedsDisplay method in your main view and I hope that you know that all of your subviews should be redrawn.