UIViewContentModeScaleAspectFit不适用于UIScrollView子视图UIImageView

Question

For hours I've been trying to figure out why the UIScrollView won't display the images from a NSMutableArray .

I realized the uiimageview objects are in the subview collection inside the UISCrollview but somehow the UIViewContentModeScaleAspectFit is ignored... How can I fit to scale then?

please, any tips?

- (void)viewDidLoad
{
    [super viewDidLoad];

    BookDalc* bookDalc = [[BookDalc alloc] init];

    NSMutableArray* books = [bookDalc FindByIconID:IconID];

    for(int i = 0;i<books.count;i++)
    {
        CGRect frame;
        frame.origin.x = self.scrBook.frame.size.width * i;
        frame.origin.y = 0;
        frame.size = self.scrBook.frame.size;

        UIImageView *subview = [[UIImageView alloc] initWithFrame:frame];
        subview.contentMode = UIViewContentModeScaleAspectFit;

        BookEntity *currentModel = [books objectAtIndex:i];
        UIImage *currentImage = [currentModel TheImage];

        subview.image = currentImage;
        [self.scrBook addSubview:subview];
    }
    self.scrBook.contentSize
    = CGSizeMake(self.scrBook.frame.size.width * books.count, self.scrBook.frame.size.height);
}

Answer 1

The frame of self.srcBook might not be set.

For more information read this answer. Why am I having to manually set my view's frame in viewDidLoad?