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A bug occurs when switching the navigation bar. How to reproduce: Click here and there in the app and it may appear.
When this bug occurs, this problem will occur when entering any page with a navigation bar from the home page.

//項目中使用了下面這個category
#import "UINavigationController+FDFullscreenPopGesture.h"

//自定義首頁導(dǎo)航欄的代碼
//left item
UIButton *leftItem = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 40, 14)];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:leftItem];

//title view
UIImageView *titleImage = [[UIImageView alloc] initWithImage:IMAGE(@"鄉(xiāng)味匯橫版")];
self.navigationItem.titleView = titleImage;

//right item
UIImageView *rightItem = [[UIImageView alloc] initWithImage:IMAGE(@"消息")];
[rightItem addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(showMessage)] ];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:rightItem];

//UINavigationController FDFullscreenPopGesture source code link