iOS 使用charts绘制饼图、折线图、K线图(混合图表)

charts是iOS上一个非常优秀的使用swift编写的图表框架，点击查看项目github链接，使用该框架可以轻松的绘制出非常漂亮的图表，但是由于是swift写的，导致在OC编写的项目中集成起来比较困难，如何集成可以看一下我之前写的一篇文章

图片来源于github该项目 图片来源于github该项目 图片来源于github该项目 图片来源于github该项目 图片来源于github该项目 图片来源于github该项目 图片来源于github该项目 图片来源于github该项目 图片来源于github该项目 图片来源于github该项目 图片来源于github该项目 图片来源于github该项目 图片来源于github该项目

以下是我实现的部分图表的代码，仅供参考

饼图

- (PieChartView *)chartView
{
    if (!_chartView) {
        _chartView = [[PieChartView alloc] init];
        _chartView.backgroundColor = [UIColor clearColor];
        //设置没有数据时显示的内容
        _chartView.noDataText = @"未获取到数据";
        //饼状图距离边缘的间隙
        [_chartView setExtraOffsetsWithLeft:0 top:12 right:0 bottom:5];
        //显示空心
        _chartView.drawHoleEnabled = YES;
        //透明圈的占比
        _chartView.transparentCircleRadiusPercent = 0;
        //空心的颜色
        _chartView.holeColor = [UIColor colorWithRed:20/255.0 green:43/255.0 blue:59/255.0 alpha:1/1.0];
        //中间空心的占比
        _chartView.holeRadiusPercent = 0.55;
        //不允许旋转
        _chartView.rotationEnabled = NO;
        //设置图例在视图中占的比例
        _chartView.legend.maxSizePercent = 1.2;//图例在饼状图中的大小占比, 这会影响图例的宽高
        _chartView.legend.formToTextSpace = 5;//文本间隔
        _chartView.legend.font = [UIFont systemFontOfSize:10];//字体大小
        _chartView.legend.textColor = [UIColor clearColor];//字体颜色
        _chartView.legend.form = ChartLegendFormCircle;//图示样式: 方形、线条、圆形
        //设置图示大小为0
        _chartView.legend.formSize = 0;//图示大小
        //居中
        _chartView.legend.horizontalAlignment = ChartLegendHorizontalAlignmentCenter;
        //下方
        _chartView.legend.verticalAlignment = ChartLegendVerticalAlignmentBottom;
        //横着显示
        _chartView.legend.orientation = ChartLegendOrientationHorizontal;
        //设置description
        ChartDescription *des = [[ChartDescription alloc] init];
        des.text = @"";
        des.font = [UIFont systemFontOfSize:10*SCALE];
        des.textAlign = NSTextAlignmentLeft;
        des.textColor = [UIColor whiteColor];
        [_chartView setChartDescription:des];
    }
    return _chartView;
}

- (void)setDataWithModel:(NSArray *)arr
{
    //饼状图总共有几块组成
    NSInteger count = arr.count;
    //每个区块内的数据
    NSMutableArray *yVals = [[NSMutableArray alloc] init];
    for (int i = 0; i < count; i++) {
        CoinRatioModel *model = arr[i];
        double value = [[model.ratio substringToIndex:model.ratio.length - 1] doubleValue];
        NSString *name = model.coinName;
        PieChartDataEntry *entry = [[PieChartDataEntry alloc] initWithValue:value label:name];
        [yVals addObject:entry];
    }
    
    PieChartDataSet *dataSet = [[PieChartDataSet alloc] initWithValues:yVals label:@""];
    dataSet.drawValuesEnabled = YES;
    NSMutableArray *colors = [NSMutableArray arrayWithCapacity:0];
    [colors addObject:[UIColor colorWithRed:114/255.0 green:179/255.0 blue:249/255.0 alpha:1/1.0]];
    [colors addObject:[UIColor colorWithRed:85/255.0 green:157/255.0 blue:233/255.0 alpha:1/1.0]];
    [colors addObject:[UIColor colorWithRed:74/255.0 green:148/255.0 blue:227/255.0 alpha:1/1.0]];
    [colors addObject:[UIColor colorWithRed:54/255.0 green:121/255.0 blue:193/255.0 alpha:1/1.0]];
    [colors addObject:[UIColor colorWithRed:38/255.0 green:100/255.0 blue:167/255.0 alpha:1/1.0]];
    [colors addObject:[UIColor colorWithRed:29/255.0 green:83/255.0 blue:142/255.0 alpha:1/1.0]];
    [colors addObject:[UIColor colorWithRed:26/255.0 green:69/255.0 blue:110/255.0 alpha:1/1.0]];
    dataSet.colors = colors;
    //相邻区块间距
    dataSet.sliceSpace = 0;
    //选中区块时, 放大的半径
    dataSet.selectionShift = 0;
    dataSet.xValuePosition = PieChartValuePositionOutsideSlice;//名称位置
    dataSet.yValuePosition = PieChartValuePositionOutsideSlice;//数据位置
    //数据与区块之间的用于指示的折线样式
    dataSet.valueLinePart1OffsetPercentage = 0.85;//折线中第一段起始位置相对于区块的偏移量, 数值越大, 折线距离区块越远
    dataSet.valueLinePart1Length = 0.4;//折线中第一段长度占比
    dataSet.valueLinePart2Length = 2;//折线中第二段长度最大占比
    dataSet.valueLineWidth = 1;//折线的粗细
    dataSet.valueLineColor = [UIColor colorWithRed:152/255.0 green:199/255.0 blue:248/255.0 alpha:1];//折线颜色
    dataSet.valueFont = [UIFont systemFontOfSize:10*SCALE];
    dataSet.valueColors = @[[UIColor whiteColor],[UIColor whiteColor],[UIColor whiteColor]];
    
    PieChartData *data = [[PieChartData alloc] initWithDataSet:dataSet];
    NSNumberFormatter *pFormatter = [[NSNumberFormatter alloc] init];
    pFormatter.numberStyle = NSNumberFormatterPercentStyle;
    pFormatter.maximumFractionDigits = 4;
    pFormatter.multiplier = @1.f;
    pFormatter.percentSymbol = @" %";
    [data setValueFormatter:[[ChartDefaultValueFormatter alloc] initWithFormatter:pFormatter]];
    [data setValueTextColor:[UIColor whiteColor]];
    [data setValueFont:[UIFont systemFontOfSize:10*SCALE]];
    
    [self.chartView setData:data];
}

折线图

- (LineChartView *)lineChartView
{
    if (!_lineChartView) {
        _lineChartView = [[LineChartView alloc] init];
        //禁止X轴拖拽
        _lineChartView.scaleXEnabled = NO;
        //禁止Y轴拖拽
        _lineChartView.scaleYEnabled = NO;
        //不显示描述
        _lineChartView.chartDescription.enabled = NO;
        //不显示图例
        _lineChartView.legend.enabled = NO;
        //不显示左边坐标轴
        _lineChartView.leftAxis.enabled = NO;
        //不显示右边坐标轴
        _lineChartView.rightAxis.enabled = NO;
        //不显示X轴
        _lineChartView.xAxis.enabled = NO;
    }
    return _lineChartView;
}

//设置数据源方法
- (void)setDataArr:(NSArray<NSString *> *)dataArr
{
    _dataArr = dataArr;
    //定义一个数组承接数据
    //对应Y轴上面需要显示的数据
    NSMutableArray *yVals = [[NSMutableArray alloc] init];
    for (int i = 0; i < dataArr.count; i++) {
        //将横纵坐标以ChartDataEntry的形式保存下来，注意横坐标值一般是i的值，而不是你的数据
        //里面具体的值，如何将具体数据展示在X轴上我们下面将会说到。
        double yValue = [dataArr[i] doubleValue];
        ChartDataEntry *entry = [[ChartDataEntry alloc] initWithX:i y:yValue];
        [yVals addObject:entry];
    }
    LineChartDataSet *set1 = nil;
    //请注意这里，如果你的图表以前绘制过，那么这里直接重新给data赋值就行了。
    //如果没有，那么要先定义set的属性。
    if (self.lineChartView.data.dataSetCount > 0) {
        LineChartData *data = (LineChartData *)self.lineChartView.data;
        set1 = (LineChartDataSet *)data.dataSets[0];
        set1 = (LineChartDataSet *)self.lineChartView.data.dataSets[0];
        set1.values = yVals;
        //通知data去更新
        [self.lineChartView.data notifyDataChanged];
        //通知图表去更新
        [self.lineChartView notifyDataSetChanged];
    }else
    {
        //创建LineChartDataSet对象
        set1 = [[LineChartDataSet alloc] initWithValues:yVals];
        //自定义set的各种属性
        //设置为绘制贝塞尔曲线
//        set1.mode = LineChartModeCubicBezier;
        //设置折线的样式
        set1.drawIconsEnabled = NO;
        //折线宽度
        set1.formLineWidth = 1.1;
        set1.formSize = 15.0;
        //是否在拐点处显示数据
        set1.drawValuesEnabled = NO;
        //折线拐点处显示数据的颜色
        set1.valueColors = @[[UIColor redColor]];
        //折线颜色
        [set1 setColor:[UIColor colorWithRed:227/255.0 green:72/255.0 blue:74/255.0 alpha:1]];
        //是否绘制拐点
        set1.drawCirclesEnabled = NO;
        //渐变填充
        set1.drawFilledEnabled = YES;
        NSArray *gradientColors = @[(id)[UIColor colorWithRed:251/255.0 green:188/255.0 blue:189/255.0 alpha:0.1].CGColor,(id)[UIColor colorWithRed:227/255.0 green:72/255.0 blue:74/255.0 alpha:1].CGColor];
        CGGradientRef gradientRef = CGGradientCreateWithColors(nil, (CFArrayRef)gradientColors, nil);
        //透明度
        set1.fillAlpha = 1.0f;
        set1.fill = [ChartFill fillWithLinearGradient:gradientRef angle:90.0f];//赋值填充颜色对象
        //释放gradientRef
        CGGradientRelease(gradientRef);
        //点击选中拐点的交互样式
        //选中拐点,是否开启高亮效果(显示十字线)
        set1.highlightEnabled = NO;
        //将 LineChartDataSet 对象放入数组中
        NSMutableArray *dataSets = [[NSMutableArray alloc] init];
        [dataSets addObject:set1];
        //创建 LineChartData 对象, 此对象就是lineChartView需要最终数据对象
        LineChartData *data = [[LineChartData alloc] initWithDataSets:dataSets];
        //文字字体
        [data setValueFont:[UIFont systemFontOfSize:8.f]];
        //文字颜色
        [data setValueTextColor:[UIColor redColor]];
        
        self.lineChartView.data = data;
    }
}

混合图表

- (CombinedChartView *)chartView
{
    if (!_chartView) {
        _chartView = [[CombinedChartView alloc] init];
        _chartView.backgroundColor = [UIColor colorWithRed:20/255.0 green:43/255.0 blue:59/255.0 alpha:1/1.0];
        _chartView.leftAxis.enabled = NO;
        _chartView.rightAxis.labelTextColor = [UIColor grayColor];
        _chartView.xAxis.drawLabelsEnabled = NO;
        //X轴数据显示在下面
        _chartView.xAxis.labelPosition = XAxisLabelPositionBottom;
        //右Y轴数据显示在内部
        _chartView.rightAxis.labelPosition = YAxisLabelPositionInsideChart;
        //禁止X轴拖拽
        _chartView.scaleXEnabled = NO;
        //禁止Y轴拖拽
        _chartView.scaleYEnabled = NO;
        //不显示描述
        _chartView.chartDescription.enabled = NO;
        //不显示图例
        _chartView.legend.enabled = NO;
        //设置绘制顺序
        _chartView.drawOrder = @[@(CombinedChartDrawOrderCandle),@(CombinedChartDrawOrderLine)];
        //设置右Y轴坐标显示个数
        _chartView.rightAxis.labelCount = 4;
    }
    return _chartView;
}

/**
 获取一条折线数据

 @param dataArr <#dataArr description#>
 @return <#return value description#>
 */
- (LineChartDataSet *)getLineWithArr:(NSArray *)dataArr lineColor:(UIColor *)lineColor
{
    //对应Y轴上面需要显示的数据
    NSMutableArray *yVals = [[NSMutableArray alloc] init];
    for (int i = 0; i < dataArr.count; i++) {
        //将横纵坐标以ChartDataEntry的形式保存下来，注意横坐标值一般是i的值，而不是你的数据
        //里面具体的值，如何将具体数据展示在X轴上我们下面将会说到。
        double yValue = [dataArr[i] doubleValue];
        ChartDataEntry *entry = [[ChartDataEntry alloc] initWithX:i y:yValue];
        [yVals addObject:entry];
    }
    //创建LineChartDataSet对象
    LineChartDataSet *set = [[LineChartDataSet alloc] initWithValues:yVals];
    //自定义set的各种属性
    //设置折线的样式
    set.drawIconsEnabled = NO;
    //折线宽度
    set.formLineWidth = 1.1;
    set.formSize = 15.0;
    //是否在拐点处显示数据
    set.drawValuesEnabled = NO;
    //折线颜色
    [set setColor:lineColor];
    //是否绘制拐点
    set.drawCirclesEnabled = NO;
    //渐变填充
    set.drawFilledEnabled = NO;
    //点击选中拐点的交互样式
    //选中拐点,是否开启高亮效果(显示十字线)
    set.highlightEnabled = NO;
    //设置为绘制贝塞尔曲线
    set.mode = LineChartModeCubicBezier;
    return set;
}

/**
 生成一组随机数

 @param count 个数
 @param max 最大值
 @return 一组随机数
 */
- (NSArray *)getRandomArrWithCount:(NSInteger)count max:(int)max
{
    NSMutableArray *arr = [NSMutableArray arrayWithCapacity:0];
    for (int i = 0; i < count; i++) {
        CGFloat val = (arc4random_uniform(max));
        NSString *str = [NSString stringWithFormat:@"%f",val];
        [arr addObject:str];
    }
    return arr;
}

/**
 获取折线数据
 */
- (LineChartData *)getLineData
{
    //折线一
    LineChartDataSet *set1 = [self getLineWithArr:[self getRandomArrWithCount:40 max:50]  lineColor:[UIColor greenColor]];
    //折线二
    LineChartDataSet *set2 = [self getLineWithArr:[self getRandomArrWithCount:40 max:100]  lineColor:[UIColor yellowColor]];
    //创建 LineChartData 对象, 此对象就是lineChartView需要最终数据对象
    LineChartData *data = [[LineChartData alloc] initWithDataSets:@[set1,set2]];
    //文字字体
//    [data setValueFont:[UIFont systemFontOfSize:8.f]];
    //文字颜色
//    [data setValueTextColor:[UIColor redColor]];
    return data;
}

- (CandleChartData *)getCandleData
{
    NSMutableArray *yVals = [[NSMutableArray alloc] init];
    // 产生40个随机立柱数据
    for (int i = 0; i < 40; i ++) {
        CGFloat val = (arc4random_uniform(80));
        CGFloat high = (arc4random_uniform(9)) + 8.0;
        CGFloat low = (arc4random_uniform(9)) + 8.0;
        CGFloat open = (arc4random_uniform(8)) + 2.0;
        CGFloat close = (arc4random_uniform(8)) + 2.0;
        
        CGFloat even = i % 2 == 0;
        
        CandleChartDataEntry *y = [[CandleChartDataEntry alloc] initWithX:i shadowH:val + high shadowL:val - low open:even  ? val + open : val - open close:even ? val + close : val - close];
        
        [yVals addObject:y];
    }
    
    CandleChartDataSet *set = [[CandleChartDataSet alloc] initWithValues:yVals];
    
    //这是用于显示最高最低值区间的立线
//    set.shadowColor = [UIColor whiteColor];
    //设置用于显示最高最低值区间的立线颜色与内部颜色保持一致
    set.shadowColorSameAsCandle = YES;
    //不在面板上直接显示数值
    set.drawValuesEnabled = NO;
    // 立线的宽度
    set.shadowWidth = 1;
    // close >= open
    set.increasingColor = [UIColor colorWithRed:227/255.0 green:72/255.0 blue:74/255.0 alpha:1/1.0];
    // 内部是否充满颜色
    set.increasingFilled = YES;
    // open > close
    set.decreasingColor = [UIColor colorWithRed:32/255.0 green:179/255.0 blue:94/255.0 alpha:1];
    // 内部是否充满颜色
    set.decreasingFilled = YES;
    //自然状态下的颜色
    set.neutralColor = [UIColor whiteColor];
    
    CandleChartData *data = [[CandleChartData alloc] initWithDataSet:set];
    
    return data;
}