iOS 11 UINavigationBar类别问题

Question

当我覆盖UINavigationbar的layoutSubviews时，所有的子视图都将被删除。我正在尝试设置自定义导航栏高度。它工作得很好，但在iOS 11中取得了突破。它是一个自定义类别。

Answer 1

我已经用setFrame:和layoutSubviews方法创建了UINavigationBar的一个子类。您需要在Storyboard中将子类设置为NavigationController的NavigationBar。

CGFloat const NavBarHeight = 88.0;

- (CGSize)sizeThatFits:(CGSize)size {
    return [self getNavBarSize];
}

- (void)setFrame:(CGRect)frame {
    frame.size.height = NavBarHeight;

    for (UIView *subview in self.subviews) {
        if ([NSStringFromClass([subview class])  containsString:@"UINavigationBarContentView"]) {
            subview.frame = CGRectMake(0, 20, self.frame.size.width, NavBarHeight-30);
        }
        [subview sizeToFit];
    }
    [super setFrame:frame];

}

- (void)layoutSubviews {
    [super layoutSubviews];
    for (UIView *subview in self.subviews) {
        if ([NSStringFromClass([subview class]) containsString:@"BarBackground"]) {
            subview.frame = CGRectMake(0, -20, self.frame.size.width, NavBarHeight+20);
            [subview sizeToFit];
        }else if ([NSStringFromClass([subview class])  containsString:@"UINavigationBarContentView"]) {
            subview.frame = CGRectMake(0, 20, self.frame.size.width, NavBarHeight-30);
        }
    }
}