IOS 点击tabbaritem跳转到一个新界面，且隐藏tabbar

先自定义一个UITabbarController，用于Storyboard中



再在MyTabbarController中实现protocol

@interface MyTabbarController : UITabBarController <UITabBarControllerDelegate>

@end

再实现代理里面的方法

@implementation MyTabbarController

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
NSLog(@"shouldSelectViewController  %@", tabBarController.selectedViewController);
if (viewController.tabBarItem.tag == 100) {
DiaryViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:DIARY_VC_ID];
[((UINavigationController *)tabBarController.selectedViewController) pushViewController:vc animated:YES];
return NO;
}
return YES;
}

- (id)initWithCoder:(NSCoder *)aDecoder {
self = [super initWithCoder:aDecoder];
if (self) {
self.delegate = self;
}
return self;
}
@end

在要监听的tabbaritem跳转的viewcontroller中（比如点击一个item隐藏tabbar，而且有返回按钮）

则找到该tabbar，我的是父控件的tabbar，所以

- (void)viewWillAppear:(BOOL)animated {
self.parentViewController.tabBarController.tabBar.hidden = YES;
}

点击返回按钮后回到开始所选中的tabbaritem

- (void)viewWillDisappear:(BOOL)animated {
self.parentViewController.tabBarController.tabBar.hidden = NO;
}

点击以上图片中的“日记”时，则