iOS开发 — 多张图片上下拼接

项目中需要实现：

如图，该产品详情页“购买须知”以下部分并不是一个H5页面，而是由后台加载出来的最多20张图片上下拼接而成。这里图片的拼接，我使用了一个强大的富文本控件TYAttributedLabel来实现。

实现代码：

1、导入主头文件

#import "TYAttributedLabel.h"

2、计算拼接图片的总高度

                CGFloat footerHeight = 0;
                for (NSInteger i = 1; i < 21; i ++) {
                    NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@%@%@",model.resUrl,model.productInfoList[0][@"productBasicAttr"][@"desUrlList"][@"value"],[NSString stringWithFormat:@"/rights%ld.jpg",(long)i]]]];
                    if (data) {
                        UIImage *image = [UIImage imageWithData:data];
                        CGFloat imgWidth = (CGFloat)SCREEN_WIDTH;
                        CGFloat imgHeight =  imgWidth * image.size.height/image.size.width;
                        footerHeight += imgHeight;
                    }
                }
                //创建tableView底部拼接图片
                [self foundTableFooterImage:footerHeight model:model];

3、创建tableView底部拼接图片

/**
 创建带有拼接图片的富文本
 */
- (void)foundTableFooterImage:(CGFloat)height model:(CommodityModel *)model
{
    UIView *tableFooterView = [[UIView alloc] initWithFrame:FRAME(0, 0, SCREEN_WIDTH, height)];
    self.mainTableView.tableFooterView = tableFooterView;

    TYAttributedLabel *label = [[TYAttributedLabel alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, height)];
    [tableFooterView addSubview:label];
    //追加图片
    for (NSInteger i = 1; i < 21; i ++) {
        NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@%@%@",model.resUrl,model.productInfoList[0][@"productBasicAttr"][@"desUrlList"][@"value"],[NSString stringWithFormat:@"/rights%ld.jpg",(long)i]]]];
        if (data) {
            UIImage *image = [UIImage imageWithData:data];
            CGFloat imgWidth = (CGFloat)SCREEN_WIDTH;
            CGFloat imgHeight =  imgWidth * image.size.height/image.size.width;
            
            TYImageStorage *imageStorage = [[TYImageStorage alloc]init];
            imageStorage.image = image;
            imageStorage.imageAlignment = TYImageAlignmentCenter;
            imageStorage.size = CGSizeMake(SCREEN_WIDTH, imgHeight);
            [label appendTextStorage:imageStorage];
        }
    }
}