_classBtn = [UIButton buttonWithType:UIButtonTypeCustom];
_classBtn.frame = CGRectMake( kDeviceWidth -200-30-10, l2.top , 200, 30);
_classBtn.backgroundColor = [UIColor yellowColor];
_classBtn.titleLabel.font = [UIFont systemFontOfSize:12];
[_classBtn setTitleColor:kMainBlueColor forState:0];
[_classBtn setTitle:@"点击选择分类" forState:0];
_classBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight; //标题靠右
[contentScrollView addSubview:_classBtn];