Make the navigation bar transparent and remove the line below the navigation bar

The following code allows the navigation bar to become transparent

[Self.navigationController.navigationBar setbackgroundimage:[uiimage new] forbarmetrics:uibarmetricscompact];
Or you can fill it with a transparent picture.

Hide the line below the navigation bar
Navigationbar.shadowimage This method doesn't know why it's useless. Now you can use the following code
This code is to let the following line disappear
Nsarray *list = self.navigationBar.subviews;
for (the ID obj in list) {
if ([Nsstringfromclass ([obj class]) isequaltostring:@ "_uinavigationbarbackground"]) {
((uiview*) obj). Subviews[0].hidden = YES;
}
}

Make the navigation bar transparent and remove the line below the navigation bar