修改导航栏返回按钮的图片

方法1：

[UINavigationBar appearance].backIndicatorTransitionMaskImage = [UIImage imageNamed:@"backArrowMask.png"];

[UINavigationBar appearance].backIndicatorImage = [UIImage imageNamed:@"icon_arrowback_n”];

icon_arrowback_n 大小为@2x = 42* 42

方法2：

UIButton * btn = [[UIButton alloc] init];

btn.frame = CGRectMake(0, 0, 30, 44);

UIImage * bImage = [[UIImage imageNamed: @"icon_back_bar.png"] resizableImageWithCapInsets: UIEdgeInsetsMake(0, 0, 0, 0)];

[btn addTarget: self

action: @selector(backButtonClick:)

forControlEvents: UIControlEventTouchUpInside];

[btn setImage: bImage forState: UIControlStateNormal];

UIBarButtonItem * lb = [[UIBarButtonItem alloc] initWithCustomView: btn];

UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]

initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace

target:nil action:nil];

negativeSpacer.width = - 20;

if (self.navigationController.viewControllers.count > 1) {

self.navigationItem.leftBarButtonItems = @[negativeSpacer, lb];

}

自定义返回按钮会造成返回手势不能使用，解决方法

///处理自定义返回按钮后不能侧滑

@interface RootNavigationController : UINavigationController

@end

@interface RootNavigationController : UINavigationController @end @implementation RootNavigationController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view.  self.interactivePopGestureRecognizer.delegate = self; } - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer { if (self.childViewControllers.count == ) { return NO; } return YES; }