原理：依賴scrollview的zoom功能來實現(xiàn)雙指縮放，獲取縮放參數(shù)志电，同時再對刻度進(jìn)行重繪曙咽。

先上demo：https://github.com/AlbatrossCoder/VerticalTimeRuler

效果圖：

Simulator Screen Shot - iPhone 8 - 2021-04-12 at 16.29.33.png

Simulator Screen Shot - iPhone 8 - 2021-04-12 at 16.29.16.png

Simulator Screen Shot - iPhone 8 - 2021-04-12 at 16.56.37.png

同時支持刻度值展示，調(diào)用如下方法即可：
// 傳入成對的value起止值
-(void)setRulerColorValue:(NSArray *)data;

刻度

有橫向小格子挑辆，縱向灰色線例朱，縱向著色線，使用CGPath畫線
以著色舉例：

shapeLayer3 = [CAShapeLayer layer];
    shapeLayer3.strokeColor = [UIColor colorWithRed:22/255.0 green:148/255.0 blue:156/255.0 alpha:1].CGColor;
    shapeLayer3.fillColor = [UIColor clearColor].CGColor;
    shapeLayer3.lineWidth = 4.f;
    shapeLayer3.lineCap = kCALineCapButt;
    
    for (int i = 0; i<data.count; i++) {
        // 取值
        NSDictionary * dic = data[i];
        NSNumber * startPoint = dic[@"startTime"];
        NSNumber * stopPoint = dic[@"stopTime"];
        
        CGFloat startY = _distanceValue * (startPoint.floatValue / [self.rulerAverage floatValue]) + 20;
        CGFloat endY = _distanceValue * (stopPoint.floatValue / [self.rulerAverage floatValue]) + 20;
        
        //繪線
        CGPathMoveToPoint(pathRef3, NULL, self.rulerWidth - 2, startY );//起點
        CGPathAddLineToPoint(pathRef3, NULL, self.rulerWidth  - 2, endY);//終點
    }
    
    shapeLayer3.path = pathRef3;// 著色
    [self.layer addSublayer:shapeLayer3];
    [self.layer layoutIfNeeded];

縮放

圖層為上層接收縮放鱼蝉，下層展示刻度
上層需實現(xiàn)zoom功能：

        self.maskScrollView.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);
        self.maskScrollView.minimumZoomScale = 1;
        self.maskScrollView.maximumZoomScale = 10;
        self.maskScrollView.bouncesZoom = YES;
        fakeView = [[UIView alloc]initWithFrame:self.maskScrollView.bounds];
        [self.maskScrollView addSubview:fakeView];
        self.maskScrollView.zoomScale = 5;

zoom代理設(shè)置:

-(void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view{
    if(scrollView == _rulerScrollView) return;
    NSLog(@"scrollViewWillBeginZooming:%ld withView:%ld",scrollView.tag, view.tag);
    isZooming = YES;
}

-(void)scrollViewDidZoom:(UIScrollView *)scrollView{
    if(scrollView == _rulerScrollView) return;
    
    distanceValue = distanceValue * ((scrollView.zoomScale + 15)/20.0);
    NSLog(@"distanceValue:%.2f",distanceValue);
    if(rulerAverage.intValue == 12 && distanceValue < 6){
        distanceValue = 6;
        return;
    }else if (rulerAverage.intValue == 1 && distanceValue > 30){
        distanceValue = 30;
        return;
    }
    
    if (rulerAverage.intValue == 12){
        if(distanceValue > 20){
            distanceValue = 10;
            rulerAverage = [NSNumber numberWithInt:6];
        }
    }else if(rulerAverage.intValue == 6){
        if(distanceValue > 20){
            distanceValue = 10;
            rulerAverage = [NSNumber numberWithInt:3];
        }else if (distanceValue < 5){
            distanceValue = 10;
            rulerAverage = [NSNumber numberWithInt:12];
        }
    }else if (rulerAverage.intValue == 3){
        if(distanceValue > 30){
            distanceValue = 10;
            rulerAverage = [NSNumber numberWithInt:1];
        }else if(distanceValue < 5){
            distanceValue = 10;
            rulerAverage = [NSNumber numberWithInt:6];
        }
    }else if (rulerAverage.intValue == 1){
        if(distanceValue < 10){
            distanceValue = 10;
            rulerAverage = [NSNumber numberWithInt:3];
        }
    }
    
    if(!shoudChange && distanceValue > 0){
        NSLog(@"rulerAverage:%d distanceValue:%.2f",rulerAverage.intValue, distanceValue);
        [self drawRuler];
        [_rulerScrollView drawColorRuler:_valueArr];
    }
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.05 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        self->shoudChange = NO;
    });
}

-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale{
    if(scrollView == _rulerScrollView) return;
    NSLog(@"scrollViewDidEndZooming:%ld withView:%ld scale:%f",scrollView.tag, view.tag, scale);
    
    self.maskScrollView.zoomScale = 5;
    self.maskScrollView.contentSize = CGSizeMake(0, self.rulerScrollView.contentSize.height+20);
    self.maskScrollView.contentOffset = self.rulerScrollView.contentOffset;
    isZooming = NO;
}

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
    return fakeView;
}

注意上層ScrollView中有個透明的view 洒嗤，fakeVew，這個必須在ScrollView實現(xiàn)zoom功能之前放進(jìn)ScrollView中蚀乔，zoom才會生效烁竭。

處理兩個ScrollView的聯(lián)動及滾動：

- (void)scrollViewDidScroll:(BDRulerScrollView *)scrollView {
    if(scrollView == self.rulerScrollView){
        CGFloat offSetY = scrollView.contentOffset.y;
        CGFloat ruleValue = (offSetY / distanceValue) * [scrollView.rulerAverage floatValue];
        
        if (ruleValue < 0.f) {
            return;
        } else if (ruleValue > scrollView.rulerCount * [scrollView.rulerAverage floatValue]) {
            return;
        }
        if (self.rulerDeletate) {
            if(!isZooming && !isInit){
                defaultValue = ruleValue;
            }
            [self.rulerDeletate txhRrettyRuler:scrollView withValueOfRuler:ruleValue];
        }
    }else{
        if(isInit){
            isInit = NO;
        }else{
            if(isZooming){
                return;
            }
            self.rulerScrollView.contentOffset = CGPointMake(0, self.maskScrollView.contentOffset.y);
        }
    }
}

- (void)scrollViewDidEndDecelerating:(BDRulerScrollView *)scrollView {
    if(self.rulerScrollView == scrollView){
        if([self.rulerDeletate respondsToSelector:@selector(moveActionFinish)]){
            [self.rulerDeletate moveActionFinish];
        }
    }
}

- (void)scrollViewDidEndDragging:(BDRulerScrollView *)scrollView willDecelerate:(BOOL)decelerate {
    if(!decelerate){
        [self scrollViewDidEndDecelerating:scrollView];
    }else{
        [scrollView setContentOffset:scrollView.contentOffset animated:NO];
    }
}

PS：總的說來實現(xiàn)還是比較簡單，但是做這個東西的時候時間緊迫寫帖子的時候也就還沒來得及寫備注吉挣，不過代碼應(yīng)該很好讀懂派撕，建議直接下demo看代碼。