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Custom NavigationBar performance issue in iOS

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Hi,
I have a custom navigation bar which I have created using dependency service because I want navigation buttons on both left and right side of the navigation bar.
While moving from one page to another page, inside "OnAppearing" function I am calling the dependency service and the functions to change the buttons on the new page. I am changing the header which is a text and I am changing the navigation bar icons which are images. the icons changes after the new page is visible only, that means it takes some time delay so that the user is able to see that the old icon disappears and the new icon appears. This problem does not happens with the header text.

Can anyone help me with this issue please?


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