iOS : How to add Underline in UITabBarItem - ios

Question

I am working in a application where i need to add underline in UITabbarItem.
so i would like to add underline under the selected UITabbarItem in Default UITabbarcontroller of iOS.
I have already created subclass of UITabbarcontroller but didn't find any way to add line in that.
I want to do something like below image.
If anyone have any idea for this please share here.

Answer 1

Code for Swift 3
In didFininshLaunch call method:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
UITabBar.appearance().selectionIndicatorImage = getImageWithColorPosition(color: UIColor.blue, size: CGSize(width:(self.window?.frame.size.width)!/4,height: 49), lineSize: CGSize(width:(self.window?.frame.size.width)!/4, height:2))
return true
}
Method:
func getImageWithColorPosition(color: UIColor, size: CGSize, lineSize: CGSize) -> UIImage {
let rect = CGRect(x:0, y: 0, width: size.width, height: size.height)
let rectLine = CGRect(x:0, y:size.height-lineSize.height,width: lineSize.width,height: lineSize.height)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
UIColor.clear.setFill()
UIRectFill(rect)
color.setFill()
UIRectFill(rectLine)
let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return image
}

Answer 2

Please try this one.
I have used in my application once and hope it will help you too.
This is how I have created Tab bar programmatically:
UITabBarController *tab = [[UITabBarController alloc]init];
ViewController1 *v1 = [[ViewController1 alloc]init];
ViewController1 *v2 = [[ViewController1 alloc]init];
ViewController1 *v3 = [[ViewController1 alloc]init];
ViewController1 *v4 = [[ViewController1 alloc]init];
tab.viewControllers = [NSArray
arrayWithObjects:v1,v2,v3,v4,nil];
[[tab.tabBar.items objectAtIndex:0]setImage:[UIImage imageNamed:#""]];
[[tab.tabBar.items objectAtIndex:1]setImage:[UIImage imageNamed:#""]];
[[tab.tabBar.items objectAtIndex:2]setImage:[UIImage imageNamed:#""]];
[[tab.tabBar.items objectAtIndex:3]setImage:[UIImage imageNamed:#""]];
int divide = 4;
if([UIDevice currentDevice].userInterfaceIdiom ==UIUserInterfaceIdiomPad)
divide =6;
}
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(tab.tabBar.frame.origin.x,tab.tabBar.frame.origin.y, self.view.frame.size.width/divide, 56)];
UIImageView *border = [[UIImageView alloc]initWithFrame:CGRectMake(view.frame.origin.x,view.frame.size.height-6, self.view.frame.size.width/divide, 6)];
border.backgroundColor = “your color”;
[view addSubview:border];
[tab.tabBar setSelectionIndicatorImage:[self changeViewToImage:view]];
//This is the method that will draw the underline
-(UIImage ) changeViewToImage : (UIView ) viewForImage {
UIGraphicsBeginImageContext(viewForImage.bounds.size);
[viewForImage.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}

Answer 3

Just Place this code into Appdelegate.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
UIView *view1 = [[UIView alloc]initWithFrame:CGRectMake([UITabBar appearance].frame.origin.x,[UITabBar appearance].frame.origin.y, [[UIScreen mainScreen] bounds].size.width/3, 56)];
UIImageView *border = [[UIImageView alloc]initWithFrame:CGRectMake(view1.frame.origin.x,view1.frame.size.height-6, [[UIScreen mainScreen] bounds].size.width/3, 6)];
border.backgroundColor = [UIColor colorWithRed:255.0f/255.0f green:105.0f/255.0f blue:84.0f/255.0f alpha:1.0f];
[view1 addSubview:border];
UIImage *img=[self ChangeViewToImage:view1];
[[UITabBar appearance] setSelectionIndicatorImage:img];
[[UITabBar appearance] setTintColor: [UIColor colorWithRed:255.0f/255.0f green:105.0f/255.0f blue:84.0f/255.0f alpha:1.0f]];
return YES;
}
-(UIImage * ) ChangeViewToImage : (UIView *) viewForImage
{
UIGraphicsBeginImageContext(viewForImage.bounds.size);
[viewForImage.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}

Answer 4

In the AppDelegate didFininshLaunch Method Add Global Style for UITabbar
UITabBar.appearance().selectionIndicatorImage = UIImage.getImageWithColorPosition(UIColor.whiteColor(), size: CGSizeMake(kScreenWidth/4, 49), lineSize: CGSizeMake(kScreenWidth/4, 2))
class func getImageWithColorPosition(color: UIColor, size: CGSize, lineSize: CGSize) -> UIImage {
let rect = CGRectMake(0, 0, size.width, size.height)
let rectLine = CGRectMake(0, size.height-lineSize.height, lineSize.width, lineSize.height)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
UIColor.clearColor().setFill()
UIRectFill(rect)
color.setFill()
UIRectFill(rectLine)
let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
EDIT Swift 3
func getImageWithColorPosition(color: UIColor, size: CGSize, lineSize: CGSize) -> UIImage {
let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
let rectLine = CGRect(x: 0, y: size.height-lineSize.height, width: lineSize.width, height: lineSize.height)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
UIColor.clear.setFill()
UIRectFill(rect)
color.setFill()
UIRectFill(rectLine)
let image = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return image
}

Answer 5

Use this code to add a bottom border to any UIView object, just replace view with your UITabbarItem object:
CALayer *bottomBorder = [CALayer layer];
bottomBorder.frame = CGRectMake(0, view.frame.size.height - 1, view.frame.size.width - 1, 1);
bottomBorder.backgroundColor = [UIColor lightGrayColor].CGColor;
[view.layer addSublayer:bottomBorder];