CGFloat headimageX = self.view.frame.size.width * 0.2;
CGFloat headimageY = self.view.frame.size.height * 0.25;
CGFloat headimageW = self.view.frame.size.width * 0.6;
CGFloat headimageH = headimageW;
UIImageView *headimageview = [[UIImageView alloc] init];
headimageview.frame = CGRectMake(headimageX, headimageY, headimageW, headimageH);
//这句必须写
headimageview.layer.masksToBounds = YES;
headimageview.layer.cornerRadius = headimageW * 0.5;
headimageview.image = [UIImage imageNamed:@"1"];
[self.view addSubview:headimageview];