Question

I am implementing a footer view, which is a UIView and it has a label inside it. I wanted it so that the UILabel stays in the center all the time, but it just won’t. Here’s my code:

- (void)setupFooterView
{
    UIView *footerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.scrollView_.frameWidth, kFooterViewHeight)];
    [footerView setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleWidth];
    [footerView setBackgroundColor:[UIColor clearColor]];

    UILabel *loadMoreLabel = [[UILabel alloc] initWithFrame:CGRectZero];
    [loadMoreLabel setBackgroundColor:[UIColor clearColor]];
    [loadMoreLabel setFont:[UIFont fontWithName:kProximaNova size:16]];
    [loadMoreLabel setTextColor:[UIColor whiteColor]];
    [loadMoreLabel setLineBreakMode:UILineBreakModeTailTruncation];
    CGSize desiredSize =  [[PNRConstants kLoadingMore] sizeWithFont:loadMoreLabel.font constrainedToSize:CGSizeMake(footerView.frameWidth, footerView.frameHeight) lineBreakMode:loadMoreLabel.lineBreakMode];
    [loadMoreLabel setFrameSize:desiredSize];
    [loadMoreLabel setCenter:CGPointMake(footerView.frameWidth/2, footerView.frameHeight/2)];
    self.loadingMoreLabel_ = loadMoreLabel;
    [footerView addSubview:self.loadingMoreLabel_];
    [loadMoreLabel release];

    UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
    [spinner setBackgroundColor:[UIColor clearColor]];
    [spinner setFrameX:self.loadingMoreLabel_.frameX - spinner.frameWidth - 10];
    [spinner setFrameY:self.loadingMoreLabel_.frameY];
    self.spinner_ = spinner;
    [footerView addSubview:self.spinner_];
    [spinner release]; 

    [self.scrollView_ setFooterView_:footerView];
    [footerView release];
}

What am I doing wrong here?

Answer 1

[loadMoreLabel setCenter:CGPointMake(footerView.frameWidth/2, footerView.frameHeight/2)];

The footerView.frameWidth/2 needs to be

footerView.frameWidth/2 - loadMoreLabel.frame.size.width/2

This is because the anchor of the label is in the top left corner instead of in the center. You subtract half the width of your label to account for this.