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:sj52abcd
效果图
核心思想
遍历所有的值, 将不需要的(0 或者 空字符串"")找出, 只要 前一个 出现空值, 就添加moveToPoint 方法 然后 addLineToPoint 连线.
/// 记录上一个值 if (i >= 1) lastValue = [self.valueArray[i - 1] floatValue]; 主要分为2部分绘制底层折线坐标轴 (MGAxisView 类)
绘制折线,连接点 (MGChartLineView 类)
这里主要讲解 MGChartLineView 类的内容,主要分为3个部分第一部分 绘制折线 /** * 绘制折线路径 */ - (void)drawChartLine { UIBezierPath *pointAxisPath = [[UIBezierPath alloc] init]; CGFloat lastValue = 0; CGFloat nextValue = 0; for (int i = 0; i < self.valueArray.count; i ++) { CGFloat point_X = self.xScaleMarkLEN * i + self.startPoint.x; if (i >= 1) lastValue = [self.valueArray[i - 1] floatValue]; CGFloat value = [self.valueArray[i] floatValue]; if (i <= _valueArray.count - 2) nextValue = [self.valueArray[i + 1] floatValue]; CGFloat percent = value / self.maxValue; CGFloat point_Y = self.yAxis_L * (1 - percent) + self.startPoint.y; CGPoint point = CGPointMake(point_X, point_Y); if (value > 0) [pointArray addObject:[NSValue valueWithCGPoint:point]]; if (value > 0 && lastValue == 0) { [pointAxisPath moveToPoint:point]; } if (value != 0 ) { [pointAxisPath addLineToPoint:point]; } } } 第二部分 绘制折线- (void)setupCircleViews { for (int i = 0; i < pointArray.count; i ++) { // 添加小圆点 CGPoint center = [pointArray[i] CGPointValue]; CGFloat radius = 2.0f; UIView *circleView = [[UIView alloc] initWithFrame:CGRectMake(center.x - radius, center.y - radius, radius * 2.0, radius * 2.0)]; circleView.tag = i + BASE_TAG_CIRCLEVIEW; circleView.backgroundColor = [UIColor blueColor]; circleView.layer.cornerRadius = 2; circleView.layer.masksToBounds = YES; [self addSubview:circleView]; // 竖直指示线 UIView *markLine = [[UIView alloc] initWithFrame:CGRectMake(center.x - 0.5, center.y - 0.5, 1, (1-center.y / self.yAxis_L) * self.yAxis_L + self.startPoint.y)]; markLine.tag = i + BASE_TAG_CIRCLEVIEW*2 ; [self addSubview:markLine]; } } 第三部分 绘制折线 // 添加覆盖 - (void)setupCoverViews { for (int i = 0; i < pointArray.count; i ++) { UIView *coverView = [[UIView alloc] init]; coverView.tag = BASE_TAG_COVERVIEW + i; CGPoint point = [pointArray[i] CGPointValue]; coverView.frame = CGRectMake(point.x - self.xScaleMarkLEN / 2, self.startPoint.y, self.xScaleMarkLEN, self.yAxis_L); [self addSubview:coverView]; // 添加点击手势 UITapGestureRecognizer *gesutre = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(gesutreAction:)]; [coverView addGestureRecognizer:gesutre]; } } github地址: 戳这里，论文，开题报告
