为什么页面推送动画Tabbar在iPhoneX中向上移动

我构建了一个app Demo,使用hidesBottomBarWhenPushed在Push Animation中隐藏Tabbar.

但是,当我点击跳转按钮标签栏向上移动!？像这样:

VoidLess提供的答案仅部分修复了TabBar问题.它修复了tabbar中的布局问题,但是如果你使用隐藏tabbar的viewcontroller,那么tabbar在动画期间会被错误地呈现(要重现它最好有2个segues - 一个模态和一个push.如果你交替segues,你可以看到tabbar被渲染出来的地方).请参阅下面的代码以解决这两个问题.好苹果.

class SafeAreaFixTabBar: UITabBar {

var oldSafeAreaInsets = UIEdgeInsets.zero

@available(iOS 11.0, *)
override func safeAreaInsetsDidChange() {
    super.safeAreaInsetsDidChange()

    if oldSafeAreaInsets != safeAreaInsets {
        oldSafeAreaInsets = safeAreaInsets

        invalidateIntrinsicContentSize()
        superview?.setNeedsLayout()
        superview?.layoutSubviews()
    }
}

override func sizeThatFits(_ size: CGSize) -> CGSize {
    var size = super.sizeThatFits(size)
    if #available(iOS 11.0, *) {
        let bottomInset = safeAreaInsets.bottom
        if bottomInset > 0 && size.height <50 && (size.height + bottomInset <90) {
            size.height += bottomInset
        }
    }
    return size
}

override var frame: CGRect {
    get {
        return super.frame
    }
    set {
        var tmp = newValue
        if let superview = superview, tmp.maxY != 
        superview.frame.height {
            tmp.origin.y = superview.frame.height - tmp.height
        }

        super.frame = tmp
        }
    }
}
}

Objective-C代码:

@implementation VSTabBarFix {
    UIEdgeInsets oldSafeAreaInsets;
}


- (void)awakeFromNib {
    [super awakeFromNib];

    oldSafeAreaInsets = UIEdgeInsetsZero;
}


- (void)safeAreaInsetsDidChange {
    [super safeAreaInsetsDidChange];

    if (!UIEdgeInsetsEqualToEdgeInsets(oldSafeAreaInsets, self.safeAreaInsets)) {
        [self invalidateIntrinsicContentSize];

        if (self.superview) {
            [self.superview setNeedsLayout];
            [self.superview layoutSubviews];
        }
    }
}

- (CGSize)sizeThatFits:(CGSize)size {
    size = [super sizeThatFits:size];

    if (@available(iOS 11.0, *)) {
        float bottomInset = self.safeAreaInsets.bottom;
        if (bottomInset > 0 && size.height <50 && (size.height + bottomInset <90)) {
            size.height += bottomInset;
        }
    }

    return size;
}


- (void)setFrame:(CGRect)frame {
    if (self.superview) {
        if (frame.origin.y + frame.size.height != self.superview.frame.size.height) {
            frame.origin.y = self.superview.frame.size.height - frame.size.height;
        }
    }
    [super setFrame:frame];
}


@end

这是我的方式.声明UITabBar的子类,例如ActionTabBar

迅捷3,4

class ActionTabBar: UITabBar {

    override var frame: CGRect {
        get {
            return super.frame
        }
        set {
            var tmp = newValue
            if let superview = self.superview, tmp.maxY != superview.frame.height {
                tmp.origin.y = superview.frame.height - tmp.height
            }
            super.frame = tmp
        }
    }
}

Objective-C的

@implementation ActionTabbar

- (void)setFrame:(CGRect)frame
{
    if (self.superview && CGRectGetMaxY(self.superview.bounds) != CGRectGetMaxY(frame)) {
        frame.origin.y = CGRectGetHeight(self.superview.bounds) - CGRectGetHeight(frame);
    }
    [super setFrame:frame];
}

@end