一、滑倒到顶部或底部不可滑动
CGPointoffset = scrollView.contentOffset;//scrollview当前显示区域定点相对于fram顶点的偏移量
CGRectbounds = scrollView.bounds;//原点
CGSizesize = scrollView.contentSize;//scrollview可以滚动的区域
UIEdgeInsetsinset = scrollView.contentInset;//scrollview的contentview的顶点相对于scrollview的位置
CGFloatcurrentOffset = offset.y+ bounds.size.height- inset.bottom;
CGFloatmaximumOffset = size.height;
if(offset.y <=0) {
scrollView.contentOffset =CGPointMake(0,0);
}
if(currentOffset >= maximumOffset) {//滑倒底部
scrollView.contentOffset=CGPointMake(0, maximumOffset - bounds.size.height);
return;
}
