iOS 一款简单实用的刻度尺

地址：https://github.com/dustylove/ruler

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使用方法：

 ScrollRulerView *ruler = [[ScrollRulerView alloc]initWithFrame:CGRectMake(0, 200, self.view.bounds.size.width, 100) Unit:100 Max:20000 Defalt:1000 block:^(NSInteger value) {
        label.text = [NSString stringWithFormat:@"滑到%ld了",value];
    }];
    ruler.follow = YES;//同步变化