在做PagerTabhttps://github.com/ming1016/PagerTab这个滑动切换多页面的控件时发现如果有多个scroll view系统的点击statusbar滚动回顶部功能就会失效，查了些资料找到了解决的办法，现记录下。
主要思路是先创建一个UIWindow对象给它添加一个tap手势
static UIWindow *topWinow;
+ (void)initialize {
topWinow = [[UIWindow alloc] init];
topWinow.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 20);
topWinow.windowLevel = UIWindowLevelAlert;
[topWinow addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(winTap)]];
}
递归搜索所有view查找当前位置合适的scroll view使其能够滚动到顶部
+ (void)seachScrollViewInView:(UIView *)view {
for (UIScrollView *subView in view.subviews) {
if ([subView isKindOfClass:[UIScrollView class]] && [self isCurrentShowView:subView]) {
//开始进行滚动
CGPoint offset = subView.contentOffset;
offset.y = -subView.contentInset.top;
[subView setContentOffset:offset animated:YES];
}
//寻找子视图的子视图
[self seachScrollViewInView:subView];
}
}
//根据位置判断是否合适
+ (BOOL)isCurrentShowView:(UIView *)view {
UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;
CGRect currentFrame = [keyWindow convertRect:view.frame fromView:view.superview];
CGRect winBounds = keyWindow.bounds;
BOOL intersects = CGRectIntersectsRect(currentFrame, winBounds);
return !view.isHidden && view.alpha > 0.01 && view.window == keyWindow && intersects;
}
这部分的修改已经push到github上完整的实现代码可以在PagerTab的Helper/SMTopWindow.m里看到。
