navigation bar customize back button

ios

July 21, 2015
iOS开发的一些奇巧淫技

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self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
                                         initWithImage:img
                                         style:UIBarButtonItemStylePlain
                                         target:self
                                         action:@selector(onBack:)];
self.navigationController.interactivePopGestureRecognizer.delegate = (id)self;

December 27, 2014 update
link

[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
                                                   forBarMetrics:UIBarMetricsDefault];

in AppDelegate.m

UINavigationBar * bar = [UINavigationBar appearance];
bar.backIndicatorImage = [UIImage imageNamed:@"navBackButton"];
bar.backIndicatorTransitionMaskImage = [UIImage imageNamed:@"navBackButton"];

in BaseViewController.m -viewdidload

self.navigationItem.leftItemsSupplementBackButton = YES;
self.navigationItem.backBarButtonItem = [self textBarButtonItemWithText:@""];

cannot handle the back bar button item click event