Custom UIToolbar with UINavigationController for Professionals

Question

For several weeks, I went through resources and looked for recommendations from non-kiddo dev on how to work with custom size UIToolbar in an application based on the UINavigationController. By “work” I mean an uncharacteristic approach that allows you to use key things, such as graceful hide / show toolbars, scroll-hide and other graceful animations.

Creating a custom instance of the class UIToolbarthat goes into the instance UINavigationControllerthat overrides sizeThatFits:, resizes as expected, but results in a couple of unacceptable problems.

So, here we have a common replacement sizeThatFits:, offered by many:

    - (CGSize) sizeThatFits:(CGSize)inSize {
        CGSize sz = [super sizeThatFits:inSize];
        sz.height = SS_TOOLBAR_HEIGHT;
        return sz;
    }

Ok, fine, the size is resized, but if you set breakpoints on this function, then it’s clear that something else still hits 44 pt for this height. Try setting a breakpoint there and see how often it is called - it seems suspicious (this comes into play later).

, , , , , (w/animation) . , UINavigationController hidesBarsOnSwipe, : (yuck), , WYSIWYG. , , / , . , , , lil stub/tab, , 10-20 , , , .

, sizeThatFits: UIToolbar:

- (CGSize) sizeThatFits:(CGSize)inSize {
    CGSize sz = [super sizeThatFits:inSize];
    sz.height = _minimized ? SS_TOOLBAR_HEIGHT_MINIMIZED : SS_TOOLBAR_HEIGHT;
    return sz;
}

/ , , , 15 -. , , / b0rked sizeThatFits:, . , , , :

- (CGSize) sizeThatFits:(CGSize)inSize {
    CGSize sz = [super sizeThatFits:inSize];
    if ( _animationInProgress ) {
        sz.height = _minimized ? SS_TOOLBAR_HEIGHT_MINIMIZED : SS_TOOLBAR_HEIGHT;
    }
    return sz;
}

, . sizeThatFits: , / , 44 , .

, , pro pro / , UINavigationController, . - , "" WYSIWYG-, . , , UIView, , , ( , ). "" ?

, , , , , , , iOS UINavigationController + UIToolbar.

iOS, - OS X Win vet maaaany moons, pro devs .

!

Answer 1

-intrinsicContentSize.

Answer 2

:

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• UINavigationController.

• :

  - (UIToolbar *)toolbar {
      UIToolbar *toolbar = (UIToolbar *)[self.parentViewController.view viewWithTag:1];
      if (!toolbar) {
          return super.toolbar; // prevent errors on app launch
      }
      return toolbar;
  }
  - (void)setToolbarHeight:(CGFloat)height {
      for (NSLayoutConstraint *constraint in self.toolbar.constraints) {
          if (constraint.firstAttribute == NSLayoutAttributeHeight) {
              constraint.constant = height;
          }
      }
      [self.parentViewController.view layoutSubviews];
      [self.toolbar layoutIfNeeded];
  }
  // if you need:
  - (CGFloat)toolbarHeight {
      for (NSLayoutConstraint *constraint in self.toolbar.constraints) {
          if (constraint.firstAttribute == NSLayoutAttributeHeight) {
              return constraint.constant;
              break;
          }
      }
      return -1;
  }
  

. .

2: , self.toolbarHeight = ### -animateWithDuration:.

: , toolbar.clipsToBounds YES.