iOS11下[UIApplication sharedApplication].windows的问题

app在iOS11下存在一个bug是点击图片不能显示大图

调试发现是因为在iOS11上把大图添加到window上之后不显示

代码语言：txt复制

    for (int i = [UIApplication sharedApplication].windows.count - 1; i >= 0; i--) {
        UIWindow *window = [UIApplication sharedApplication].windows[i];
        if (window.frame.size.width == [UIApplication sharedApplication].keyWindow.size.width &&
            window.frame.size.height == [UIApplication sharedApplication].keyWindow.size.height) {
            lastFullWindow = window;
            break;
        }
    }

在iOS11中，使用UIApplication sharedApplication.windows获取的最顶层的window为_UIInteractiveHighlightEffectWindow，并且其hidden = YES，所以在上面添加内容显示不出来。

代码语言：txt复制

// iOS11种多出来一个不可见的全屏window
<_UIInteractiveHighlightEffectWindow: 0x11b4647c0; frame = (0 0; 414 736); hidden = YES; opaque = NO; userInteractionEnabled = NO; gestureRecognizers = <NSArray: 0x1c4a42850>; layer = <UIWindowLayer: 0x1c483cf20>>

若之前未在keyWindow中添加其它内容，可以直接修改为UIApplication sharedApplication.keyWindow，或者对window的hidden属性进行判断，向下遍历直到获得可以显示出来的全屏window。

代码语言：txt复制

    for (int i = [UIApplication sharedApplication].windows.count - 1; i >= 0; i--) {
        UIWindow *window = [UIApplication sharedApplication].windows[i];
        if (window.frame.size.width == [UIApplication sharedApplication].keyWindow.size.width &&
            window.frame.size.height == [UIApplication sharedApplication].keyWindow.size.height &&
            window.hidden == NO) {
            lastFullWindow = window;
            break;
        }
    }

ios

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