学习目的:
*解决重写navigationItem.leftBarButtonItem导致系统自动右滑返回手势失效.
实现效果:
在push后的控制器中,通过右滑手势返回上一个控制器,不仅仅在屏幕边缘能实现返回(在屏幕中间右滑也能返回).
1.在自定义的导航控制器viewDidLoad方法中实现:
- (void)viewDidLoad {
[super viewDidLoad];
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self.interactivePopGestureRecognizer.delegate action:@selector(handleNavigationTransition:)];
[self.view addGestureRecognizer:pan];
// 控制手势什么时候触发,只有非根控制器才需要触发手势
pan.delegate = self;
// 禁止之前手势
self.interactivePopGestureRecognizer.enabled = NO;
}
2.解决返回到根控制器界面,再继续右滑导致卡死的Bug:
2.1.遵守UIGestureRecognizerDelegate协议
@interface FitfunNavigationController ()<UIGestureRecognizerDelegate>
2.2.实现代理协议方法
#pragma mark - UIGestureRecognizerDelegate
// 决定是否触发手势
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
return self.childViewControllers.count > 1;
}
3.重写UINavigationController的方法(- pushViewController: animated:):
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if (self.childViewControllers.count > 0) { // 非根控制器
viewController.hidesBottomBarWhenPushed = YES;
// 设置返回按钮,只有非根控制器
viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem fitfun_backItemWithimage:[UIImage imageNamed:@"navigationButtonReturn"] highImage:[UIImage imageNamed:@"navigationButtonReturnClick"] target:self action:@selector(back) title:@"返回"];
}
// 真正在跳转
[super pushViewController:viewController animated:animated];
}
- (void)back
{
[self popViewControllerAnimated:YES];
}
