UISearchBar increases navigation bar height in iOS 11

Question

I have my UISearchBar being part of the navigation bar like:

 let searchBar = UISearchBar()
 //some more configuration to the search bar
 .....
         


        

Answer 1

I found Mai Mai's solution to be the only one that's really usable.
However it's still not perfect:
When rotating the device, the search bar is not properly resized and remains in the smaller dimension.

I have found a fix for that. Here is my code in Objective C with the relevant parts annotated:

// improvements in the search bar wrapper
@interface SearchBarWrapper : UIView
@property (nonatomic, strong) UISearchBar *searchBar;
- (instancetype)initWithSearchBar:(UISearchBar *)searchBar;
@end
@implementation SearchBarWrapper
- (instancetype)initWithSearchBar:(UISearchBar *)searchBar {
    // setting width to a large value fixes stretch-on-rotation
    self = [super initWithFrame:CGRectMake(0, 0, 4000, 44)];
    if (self) {
        self.searchBar = searchBar;
        [self addSubview:searchBar];
    }
    return self;
}
- (void)layoutSubviews {
    [super layoutSubviews];
    self.searchBar.frame = self.bounds;
}
// fixes width some cases of resizing while search is active
- (CGSize)sizeThatFits:(CGSize)size {
    return size;
}
@end

// then use it in your VC
@implementation MyViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationItem.titleView = [[SearchBarWrapper alloc] initWithSearchBar:self.searchController.searchBar];
}
@end

Now there is still one case left that I haven't figured out yet. To reproduce do the following:
- start in portrait
- activate search field
- rotate to landscape
- error: the bar doesn't resize