多个tableview 点击状态栏当前scrollView滚动到顶部

最新推荐文章于 2020-10-24 10:46:00 发布

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本文介绍了一种方法来判断iOS应用中用户是否点击了状态栏，并通过一系列的子视图遍历找到UIScrollView，将其滚动到顶部。该方案适用于需要响应状态栏点击并作出特定反馈的应用场景。

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1、在 AppDelegate 判断是不是点击了状态栏

2、判断当前view是否在主窗口，并且是显示状态

//是否显示 #import "UIView+XMGExtension.h"

(BOOL)isShowingOnKeyWindow

{
    // 主窗口
    UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;

    // 以主窗口左上角为坐标原点, 计算self的矩形框
    CGRect newFrame = [keyWindow convertRect:self.frame fromView:self.superview];
    CGRect winBounds = keyWindow.bounds;

    // 主窗口的bounds 和 self的矩形框是否有重叠
    BOOL intersects = CGRectIntersectsRect(newFrame, winBounds);

    return !self.isHidden && self.alpha > 0.01 && self.window == keyWindow && intersects;

}

//点击判断

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];
    CGPoint location = [[[event allTouches] anyObject] locationInView:[self window]];
    CGRect statusBarFrame = [UIApplication sharedApplication].statusBarFrame;
    statusBarFrame.origin.y+=0.5;
    if (CGRectContainsPoint(statusBarFrame, location)) {
        [self windowClick];
    }
}

- (void)windowClick
{
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    [self searchScrollViewInView:window];
}

//判断是否为UIScrollView

- (void)searchScrollViewInView:(UIView *)superview
{
    for (UIScrollView *subview in superview.subviews) {
        // 如果是scrollview, 滚动最顶部
        if ([subview isKindOfClass:[UIScrollView class]] && subview.isShowingOnKeyWindow) {
            CGPoint offset = subview.contentOffset;
            offset.y = - subview.contentInset.top;
            [subview setContentOffset:offset animated:YES];
        }

        // 继续查找子控件
        [self searchScrollViewInView:subview];
    }

}