OC TableView中自定义Cell实现文字滚动效果

@interface TitleRolling : UIViewController
-(void) startScroll : (UIScrollView*) scrollview;
@end

#import "TitleRolling.h"

#pragma mark - Class define variable
#define K_MAIN_VIEW_SCROLL_HEIGHT 20.0f
#define K_MAIN_VIEW_SCROLL_TEXT_TAG 300
#define K_MAIN_VIEW_TEME_INTERVAL 0.35         //计时器间隔时间(单位秒)
#define K_MAIN_VIEW_SCROLLER_SPACE 20          //每次移动的距离
#define K_MAIN_VIEW_SCROLLER_LABLE_WIDTH  280  //字体宽度
#define K_MAIN_VIEW_SCROLLER_LABLE_MARGIN 20   //前后间隔距离

#define K_MAIN_VIEW_SCROLLER_LABLE_LENGTH2LEFT 20   //设置开头距离左侧的边距

-(void) startScroll : (UIScrollView*) view{
    
        NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
        [dict setObject:view forKey:@"scrollView"];
        NSTimer *timer_hsf = [NSTimer scheduledTimerWithTimeInterval:K_MAIN_VIEW_TEME_INTERVAL target:self selector:@selector(OnTimesetScrollText: ) userInfo:dict repeats:YES];
    
    [timer_hsf fire];
}

-(void) OnTimesetScrollText:(NSTimer *)timer{
    UIScrollView* view = [[timer userInfo] objectForKey:@"scrollView"];
    
    [UIView animateWithDuration:K_MAIN_VIEW_TEME_INTERVAL * 2 animations:^{
        CGRect rect;
        CGFloat offsetX = 0.0;
        
        //NSLog(@"view的子视图数量%lu",(unsigned long)view.subviews.count);
        UILabel *lab = view.subviews[0];
//        for (UILabel *lab in view.subviews) {
            //NSLog(@"lab: %f view:%f",lab.frame.size.width,view.frame.size.width);

            rect = lab.frame;
            offsetX = rect.origin.x - K_MAIN_VIEW_SCROLLER_SPACE;
            if (offsetX < - (rect.size.width-view.frame.size.width+4*K_MAIN_VIEW_SCROLLER_LABLE_LENGTH2LEFT))
            {
                offsetX = K_MAIN_VIEW_SCROLLER_LABLE_MARGIN + K_MAIN_VIEW_SCROLLER_LABLE_LENGTH2LEFT;//设置初始位置
            }
            
            lab.frame = CGRectMake(offsetX, rect.origin.y, rect.size.width, rect.size.height);
            
//        }
        
        //NSLog(@"offsetX:%f",offsetX);
        
    }];
    
}


#pragma 文字自适应宽度,该代码只有在纯代码模式里边，设置UILabel时候会使用到
- (CGFloat)getWidthWithTitle:(NSString *)title font:(UIFont *)font {
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 1000, 0)];
    label.text = title;
    label.font = font;
    [label sizeToFit];
    return label.frame.size.width;
}

-(UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //单元格ID
    static NSString *CellTableIndentifier = @"HSFCell";

    //重用单元格
    HSF_liquidText *cell = [tableView dequeueReusableCellWithIdentifier:CellTableIndentifier forIndexPath:indexPath];

    cell.backgroundColor = [UIColor colorWithWhite:0.0f alpha:0.0f];//单元格透明step2
    //添加图片
    cell.CaseTextContent.text = @"南山区1234567就暗示的看见爱上大家哈山东矿机爱神的箭好看好看";
    //添加右侧注释
    TitleRolling *newTitle = [[TitleRolling alloc] init];
    if(cell.CaseScrollView != nil)
    {
        //[cell.CaseScrollView addSubview:cell.CaseTextContent];
        [newTitle startScroll:cell.CaseScrollView];
    }
    else
        NSLog(@"cell的父视图：%@",cell.superview);
    
    return cell;
}