difference between navigationBar.isHidden and setNavigationBarHidden

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP



difference between navigationBar.isHidden and setNavigationBarHidden



I have view controller which I am pushing from a view controller where navigation bar is hidden. But I want to show the navigation bar in destination view controller.



I tried with this statement it was not showing navigationBar.


self.navigationController?.navigationBar.isHidden = false



I tried this statement it is working


self.navigationController?.setNavigationBarHidden(false, animated: true)



I want to know what is difference?




3 Answers
3



Nope they are not the same,



self.navigationController?.isNavigationBarHidden


self.navigationController?.isNavigationBarHidden



is a getter property (it shows you wheather the navBar is hidden or not.) It will just return a boolean value conveying the state of the NavBar weather it is hidden or not.
(try assigning its value to bool like var isHidden = self.navigationController?.isNavigationBarHidden it will give you true of false according to state to the NavBar.)


var isHidden = self.navigationController?.isNavigationBarHidden



whereas
self.navigationController?.setNavigationBarHidden(false, animated: true)


self.navigationController?.setNavigationBarHidden(false, animated: true)



is a setter propety which gives you the provision of setting the state of the navBar.



Compiler does not throw any error on self.navigationController?.isNavigationBarHidden = false
but will not do anything as you can only know the state from here.


self.navigationController?.isNavigationBarHidden = false





isNavigationBarHidden is both a setter and a getter. setNavigationBarHidden is a setter only, and allows you to set if the bar is animated or not. isNavigationBarHidden = true and setNavigationBarHidden(true, animated: false) are treated as identical by Swift. Furthermore, the question asked about navigationBar.isHidden, which I am discovering gives you different results, depending on where it is used.
– jowie
Feb 8 at 17:50



isNavigationBarHidden


setNavigationBarHidden


isNavigationBarHidden = true


setNavigationBarHidden(true, animated: false)


navigationBar.isHidden



Effect is exactly the same, but when using second version (method) you can also define animation.



When you are doing it via property - animation is off by default.



On top of that you have another option:


self.navigationController?.isNavigationBarHidden = false



More on that topic here:
https://developer.apple.com/documentation/uikit/uinavigationcontroller/1621850-isnavigationbarhidden



If true, the navigation bar is hidden. The default value is false. Setting this property changes the visibility of the navigation bar without animating the changes. If you want to animate the change, use the setNavigationBarHidden(_:animated:)method instead.





if both methods does the same why this statement self.navigationController?.isNavigationBarHidden = false is not showing the navigationBar.
– santhosh
Nov 24 '17 at 10:02






@santhosh - If you were able to understand the difference in the below given answer by me, then please mark it as a right answer. Thanks.
– Ramandeep Singh Gosal
Nov 27 '17 at 6:19



.isHidden and setNavigationBarHidden() have different effects and outcomes. We won't be talking about the animated part.


.isHidden


setNavigationBarHidden()



The property of self.navigationController?.navigationBar.isHidden is an extension from UIView. The isHidden property belongs to UIView that means that navigationBar (which extends UIView) had done some overriding in isHidden causing it to have different effect and outcome compared to setNavigationBarHidden().


self.navigationController?.navigationBar.isHidden


UIView


isHidden


UIView


navigationBar


UIView


isHidden


setNavigationBarHidden()



Example for setNavigationBarHidden(true):


setNavigationBarHidden(true)



enter image description here



where the navigationBar won't be transparent and page 1 (page with navigationBar hidden).



Example for .isHidden = true:



enter image description here



where the navigationBar is fully transparent and page 1 is displayed under page 2's navigationBar. Number 3 is the UIWindow.






By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

-

Popular posts from this blog

Firebase Auth - with Email and Password - Check user already registered

Image
Clash Royale CLAN TAG #URR8PPP Firebase Auth - with Email and Password - Check user already registered I want to check when a user attempts to signup with createUserWithEmailAndPassword() in Firebase user Authentication method, this user is already registered with my app. createUserWithEmailAndPassword() 8 Answers 8 To detect whether a user with that email address already exists, you can detect when the call to createUserWithEmailAndPassword () fails with auth/email-already-in-use . I see that @Srinivasan just posted an answer for this. createUserWithEmailAndPassword () auth/email-already-in-use Alternatively, you can detect that an email address is already used by calling fetchSignInMethodsForEmail() (previous called fetchProvidersForEmail() ). fetchSignInMethodsForEmail() fetchProvidersForEmail() When the user trying to create an user with same email address, the task response will be "Response: The email address is already in use by another account." mFirebas
Read more

Dynamically update html content plain JS

Image
Clash Royale CLAN TAG #URR8PPP Dynamically update html content plain JS So I have a script bound in my index.html, which literally has to fetch an array of jsons from an api, then dynamically update my page when get response. But as a result I'm getting an as the only update of my page. here is my script fetch(url) .then((resp) => resp.json()) .then((resp) => resp.results.forEach(item => fetch(item.url) .then((response)=> response.json()) .then((response) => pokeArr.push(response)) .catch(console.log) ) ).catch(console.log) const filler = () => if(!pokeArr) return 0 pokeArr.map((i,j)=> return `<tr>$i.name</tr>` ) const pokeindex = () => document.getElementById('a').appendChild(document.createElement(filler())) pokeindex() When I'm consoling it, I can see in the console all the responses I get, so I'm at least doing the fetching part right. What's parberakan ? What's pokeArr ? – T.J. Crowder Aug 8 at 12
Read more

How to determine optimal route across keyboard

Image
Clash Royale CLAN TAG #URR8PPP How to determine optimal route across keyboard I'm trying to automate the typing process in a video game. Players are given an on-screen QWERTY keyboard layout that they can navigate with the control stick (up, down, left, right) in order to select a letter to type. I was wondering if there was a module for Python (or some other resource I could explore) that would help my program find a path across the keyboard as it types each letter in a given message. In other words, if the first letter typed was "A" and the next letter was "B", the module would know that the program should move 1 space down on the keyboard and 4 spaces to the right. Currently, I have the program resetting to the "G" key after each letter is typed (allowing me to use fixed-directions as the program parses each character in the desired message). As you can imagine, this is quite inefficient and defeats the purpose of automating the typing in the fir
Read more