iOS shows or hides the bottom line of the navigation bar

According to the requirements of the product requirements of the interface to remove the bottom of the navigation bar, the next controller also need to have a bottom line.

Use the following code to implement the

Hide the black line when the page appears

-(void) Viewwillappear: (BOOL) animated

{

[Self.navigationController.navigationBar setbackgroundimage:[uiimage new] forbarmetrics:uibarmetricsdefault];

[Self.navigationController.navigationBar setshadowimage:[uiimage New]];

_navbarhairlineimageview.hidden = YES;

}

Let Navigationbar restore the style when the page disappears

-(void) Viewwilldisappear: (BOOL) animated{

[Self.navigationController.navigationBar Setbackgroundimage:nil Forbarmetrics:uibarmetricsdefault];

[Self.navigationController.navigationBar Setshadowimage:nil];

and define a imageview to equate this black line.

Uiimageview *navbarhairlineimageview;

_navbarhairlineimageview = [self findHairlineImageViewUnder:self.navigationController.navigationBar];

}

The only downside to this method is the translucent (transparent) properties that affect the navigation bar

Method 2: Find the black line and do the processing:

A way to find this black line (Findhairlineimageviewunder):

-(Uiimageview *) Findhairlineimageviewunder: (UIView *) View {

if ([view IsKindOfClass:UIImageView.class] && view.bounds.size.height <= 1.0) {

Return (Uiimageview *) view;

}

For (UIView *subview in view.subviews) {

Uiimageview *imageview = [self findhairlineimageviewunder:subview];

if (ImageView) {

return ImageView;

}

}

return nil;

}

The same time when the interface appears to open the hidden

-(void) Viewwillappear: (BOOL) animated

//{

_navbarhairlineimageview.hidden = YES;

//}

Let it appear when the page disappears

-(void) Viewdidappear: (BOOL) animated

{

_navbarhairlineimageview.hidden = NO;

}