頭部視圖

很常見的需求，用簡單的方式實現(xiàn)。下面放主要代碼

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

CGFloat offSet = scrollView.contentOffset.y + scrollView.contentInset.top;

NSLog(@"offSet? %f",HEADHEIGHT-offSet);

if (offSet <= 0) {

// 下拉放大

_headView.y = 0;

_headView.height = HEADHEIGHT - offSet;

_headImageView.height = _headView.height;

}else if (offSet > 0){

// 上拉處理 整體移動

_headView.height = HEADHEIGHT;

_headImageView.height = _headView.height;

CGFloat min = HEADHEIGHT - 64;

_headView.y = -MIN(min, offSet);

_headImageView.alpha = 1.0 - offSet/min;

}

}

喜歡點個star吧。