使用UIScrollView经常会执行清空视图的操作,我们普遍的做法是:
for (UIView *subview in self.scrollView.subviews) { [subview removeFromSuperview]; }
或者是:
[self.scrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
但是有没有发现,这样做以后,当你重新增加内容后,再次滑动UIScrollView时,滚动条不见了!!
所以,请不要用以上方式清空视图,而应该将加入UIScroView的内容加上你的标记,删除时过滤一下即可:
self.v1.tag = kWCScrollViewCustomItemViewTag; [self.scrollView addSubview:self.v1]; //...add more items for (UIView *subview in self.scrollView.subviews) { if(subview.tag == kWCScrollViewCustomItemViewTag) { [subview removeFromSuperview]; } }