iOS removes the line from the bottom of the navigation bar

This line will be available by default

The first method:

Uinavigationbar *navigationbar = Self.navigationController.navigationBar;
White.png picture oneself to download a pure white color block, or own PS do a
[Navigationbar setbackgroundimage:[uiimage imagenamed:@ "White.png"]
                   Forbarposition:uibarpositionany
                       Barmetrics:uibarmetricsdefault];
[Navigationbar setshadowimage:[uiimage New]];

The effect is as follows (where the original gray background color is replaced by white.png):

PS: This is the only official use to hide this line, but there is a flaw-delete the translucency (translucent)

The second method:
1 declare uiimageview variable, store bottom horizontal line

@implementation Myviewcontroller {
    uiimageview *navbarhairlineimageview;
}

2) by adding in Viewdidload:

Navbarhairlineimageview = [self findhairlineimageviewunder:navigationbar];

3) Realize the function of finding the bottom horizontal line

-(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;
}

4) Finally in the viewwillappear,viewwilldisappear processing

-(void) Viewwillappear: (BOOL) animated {
    [Super viewwillappear:animated];
    Navbarhairlineimageview.hidden = YES;
}

-(void) Viewwilldisappear: (BOOL) animated {
    [Super viewwilldisappear:animated];
    Navbarhairlineimageview.hidden = NO;
}

The effect is as follows:

PS: The second way to keep bar translucent

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