Layout + size calculations for iOS.

UIView Layout

- (CGSize)sizeOfContentsWithSize:(CGSize)size
                    shouldLayout:(BOOL)shouldLayout {
  // Calculate frames.

  if (shouldLayout) {
    // Update frames.
  }

  return // size
}

- (CGSize)sizeThatFits:(CGSize)size {
  return [self sizeOfContentsWithSize:size shouldLayout:NO];
}

- (void)layoutSubviews {
  [super layoutSubviews];

  [self sizeOfContentsWithSize:self.bounds.size shouldLayout:YES];
}

Why not call:

[view sizeToFit];
[view setNeedsLayout]; // If you need it

And do the calculation in sizeThatFits:

@taylanpince because sizeThatFits is a question that may be asked multiple times before the eventual layout of the view occurs. Calling sizeThatFits shouldn't affect the frame of the view.