Add subview in UITabBar - ios

Question

I want to customise UITabBar by subclassing it I am not able to get the UITabBar frame here is my code
in home_tabbar.h
#import <UIKit/UIKit.h>
#interface home_tabbar : UITabBar
-(void) changeFrame;
#end
in home_tabbar.m
#import "home_tabbar.h"
#implementation home_tabbar
- (void)viewDidAppear:(BOOL)animated {
[self changeFrame];
}
- (void)changeFrame
{
CGRect frame = self.viewForLastBaselineLayout.frame;
NSLog(#"Frame x= %f y=%f width=%f height=%f",frame.origin.x,frame.origin.y,frame.size.width,frame.size.height);
}
#end

Answer 1

You can do it like this…
Subclass UITabBarController, and add a property for the view you want to add, a button in this case…
#property (strong, nonatomic) IBOutlet UIButton *videoButton;
Configure in viewDidLoad…
- (void)viewDidLoad
{
[super viewDidLoad];
self.videoButton.layer.cornerRadius = 4.0;
self.videoButton.backgroundColor = [UIColor yellowColor];
self.videoButton.clipsToBounds = YES;
[self.tabBar addSubview: self.videoButton];
}
then in viewDidLayoutSubviews…
- (void) viewDidLayoutSubviews
{
[super viewDidLayoutSubviews];
// Only need to do this once if the orientation is fixed
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
self.videoButton.center = (CGPoint){CGRectGetMidX(self.tabBar.bounds), CGRectGetMidY(self.tabBar.bounds)};
});
// system moves subviews behind tab bar buttons, this fixes
[self.tabBar bringSubviewToFront: self.videoButton];
}

Answer 2

I have created a class to customize the UITabBar. In my case I had to add a background image and update the height.
Here my code:
class DDTabBar: UITabBar {
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
let backgroundImage = UIImageView(image: UIImage(named: "TabBar_Background"))
backgroundImage.contentMode = UIViewContentMode.scaleAspectFill
var tabFrame = self.bounds
tabFrame.size.height = 75
backgroundImage.autoresizingMask = [.flexibleWidth, .flexibleHeight]
tabFrame.origin.y = self.bounds.size.height - 75
backgroundImage.frame = tabFrame
self.insertSubview(backgroundImage, at: 0)
}
}