Custom button Image not visible on navigation bar iOS 7.1 - iphone

Question

I had added custom button on my navigation bar. here is the code now my problem is that in iOS7 I am able to see back Button image with text, while in iOS 7.1 the image is not displaying only text is displaying.
-(void)addBackButton{
self.navigationItem.hidesBackButton = YES;
[backButtonView removeFromSuperview];
if (backButtonView) {
[backButtonView release];
backButtonView = nil;
}
backButtonView = [[UIView alloc] initWithFrame:CGRectMake(0,6,70,30)];
NSString *strText = #"Back";
btnBack = [[UIButton alloc] initWithFrame:CGRectMake(2,0, 70, 31)];
[btnBack setTitle:strText forState:UIControlStateNormal];
btnBack.titleLabel.font = [UIFont fontWithName:#"HelveticaNeue-Medium" size:17];
btnBack.titleLabel.textColor = IOS7ColorBtnBackText;
[btnBack setImage:[UIImage imageNamed:#"Left_Arrow.png"] forState:UIControlStateNormal];
[btnBack addTarget:self action:#selector(btnBack:) forControlEvents:UIControlEventTouchUpInside];
[backButtonView addSubview:btnBack];
[btnBack release];
[self.navigationController.navigationBar addSubview:backButtonView];
}

Answer 1

Instead of adding it as subview in navigationView you can assign custom button to left or right button and this too works
UIButton *backbtn=[[UIButton alloc]initWithFrame:CGRectMake(20,5,42, 42)];
[backbtn setImage:[UIImage imageNamed:#"arrow.png"] forState:UIControlStateNormal];
[backbtn setTitle:#"Login" forState:UIControlStateNormal];
[backbtn addTarget:self action:#selector(didTapBackButton:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *barbtn=[[UIBarButtonItem alloc]initWithCustomView:backbtn];
self.navigationItem.leftBarButtonItem=barbtn;

Answer 2

[self.navigationItem setHidesBackButton:YES];
This do work, but you made mistake here
[self.navigationController.navigationBar addSubview:backButtonView];
///// Your code to create custom button goes here
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
initWithCustomView:BackButton];

Answer 3

Create custom button and add it in your navigation left bar button item as a custom view as follows:
let btnShowMenu = UIButton()
let image: UIImage = UIImage(named: "requiredImageName")!
btnShowMenu.setImage(image, for: UIControlState.normal)
btnShowMenu.frame = CGRect(x: 0, y: 0, width: 15, height: 15)
btnShowMenu.addTarget(self, action: #selector(addAnAction(_:)), for: UIControlEvents.touchUpInside)
let customBarItem = UIBarButtonItem(customView: btnShowMenu)
self.navigationItem.leftBarButtonItem = customBarItem;