为什么页面推送动画Tabbar在iPhone X中向上移动

问题描述

限时删除！！

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

I build a app Demo, use hidesBottomBarWhenPushed hide Tabbar in Push Animation.

但是，当我点击跳转按钮标签栏向上移动！？像这样：

But, When I click Jump Button Tabbar move up!? like this:

推荐答案

VoidLess提供的答案仅部分解决了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，修复这两个问题。好苹果。

Answer provided by VoidLess fixes TabBar problems only partially. It fixes layout problems within tabbar, but if you use viewcontroller that hides tabbar, the tabbar is rendered incorrectly during animations (to reproduce it is best 2 have 2 segues - one modal and one push. If you alternate the segues, you can see tabbar being rendered out of place). See the code bellow that fixes both of the problems. Good job apple.

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：

Objective-C code:

@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

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