iOS 封装导航栏及返回,获取控件所在控制器的实例

UINavigationController *vc = [[UINavigationController alloc] init];
 for (UIView* next = [sender superview]; next; next = next.superview) {
 UIResponder* nextResponder = [next nextResponder];
 if ([nextResponder isKindOfClass:[UINavigationController class]]) {
  vc = (UINavigationController*)nextResponder;
  [vc.topViewController.navigationController popViewControllerAnimated:YES];
  return;
 }
 }

+ (void)setNavigationBarWithTitle:(NSString *)title controller:(UIViewController *)controller{
 controller.title = title;
 [controller.navigationController.navigationBar setTitleTextAttributes:@{ NSForegroundColorAttributeName:kMainTextColor,NSFontAttributeName:[UIFont fontWithName:@"PingFangSC-Light" size:18]}];
 //返回按钮
 UIButton *btn = [[UIButton alloc] init];
 [btn setImage:[UIImage imageNamed:@"back"] forState:(UIControlStateNormal)];
 [btn setTitleColor:kMainTextColor forState:UIControlStateNormal];
 btn.titleLabel.font = [UIFont systemFontOfSize:13];
 [btn addTarget:self action:@selector(back:) forControlEvents:(UIControlEventTouchUpInside)];
 controller.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btn];
}
+ (void)back:(UIButton *)sender{
 UINavigationController *vc = [[UINavigationController alloc] init];
 for (UIView* next = [sender superview]; next; next = next.superview) {
 UIResponder* nextResponder = [next nextResponder];
 if ([nextResponder isKindOfClass:[UINavigationController class]]) {
  vc = (UINavigationController*)nextResponder;
  [vc.topViewController.navigationController popViewControllerAnimated:YES];
  return;
 }
 }
}