6.29 学习方法

//自定义cell的方法

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

MyVoucherCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];

if (cell == nil) {

cell = [[[NSBundle mainBundle]loadNibNamed:NSStringFromClass([MyVoucherCell class]) owner:self options:nil] lastObject];

cell.backgroundColor = [UIColor clearColor];

UIImageView *imageView = [self pastImageView];     //调用三次

[cell.backImageView addSubview:imageView];

[imageView mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.mas_equalTo(cell.backImageView.mas_top).offset(18);

make.right.mas_equalTo(cell.backImageView.mas_right).offset(-75);

make.bottom.mas_equalTo(cell.backImageView.mas_bottom).offset(-17.5);

}];

cell.storeLabel.textColor = [UIColor colorWithHexString:@"9c9c9c"];

cell.limitLabel.textColor = [UIColor colorWithHexString:@"9c9c9c"];

cell.enableLabel.textColor = [UIColor colorWithHexString:@"9c9c9c"];

cell.unitLabel.textColor = [UIColor colorWithHexString:@"9c9c9c"];

cell.priceLabel.textColor = [UIColor colorWithHexString:@"9c9c9c"];

cell.fullLabel.textColor = [UIColor colorWithHexString:@"9c9c9c"];

cell.selectionStyle = UITableViewCellSelectionStyleNone; //去掉点击效果

}

return cell;

}

-(UIImageView *)pastImageView{

_pastImageView = [[UIImageView alloc]init];

_pastImageView.image = [UIImage imageNamed:@"已过期"];

return _pastImageView;

不能用 if( nil == _pastImageView)；  防止重复创建一个对象，比拟单例

}