Charts 3.0框架繪制-柱形圖表

使用Charts框架可以實現柱形圖、曲線圖、圓型圖等。

圖表

圖表

畫折線使用 LineChartView類，用法與barChartView類型。其他類圖標可參考ChartsDemo里面的案例實現

一、初始化

柱形圖使用Charts框架中的BarChartView類:

_chartView = [[BarChartView alloc]init];
    //設置代理
    _chartView.delegate = self;//代理
    [self.view addSubview:_chartView];

二、設置圖表格式

1.基本樣式

_chartView.descriptionText = @"";//右下角描述
    _chartView.drawBarShadowEnabled = NO;//是否繪制陰影背景
    _chartView.drawValueAboveBarEnabled = YES;//數值顯示是否在條柱上面
    _chartView.noDataText = NSLocalizedString(@"加載中...", nil);//沒有數據時的顯示
    _chartView.rightAxis.enabled = NO;//不畫右邊坐標軸
    _chartView.legend.enabled = NO;//不顯示圖例說明
    _chartView.dragEnabled = NO;//不啟用拖拽圖表

2.交互設置

_chartView.doubleTapToZoomEnabled = NO;//雙擊是否縮放
    _chartView.scaleXEnabled = NO;//X軸縮放
    _chartView.scaleYEnabled = NO;//Y軸縮放
    _chartView.pinchZoomEnabled = NO;//XY軸是否同時縮放

3.X軸樣式設置

ChartXAxis *xAxis = _chartView.xAxis;
    xAxis.labelPosition = XAxisLabelPositionBottom;//X軸的顯示位置
    xAxis.drawGridLinesEnabled = NO;//不繪制網格
    xAxis.labelFont = [UIFont systemFontOfSize:10.0f];//x數值字體大小
    xAxis.labelTextColor = [UIColor blackColor];//數值字體顏色
    DateFormatter *valueFormatter = [[DateFormatter alloc] init];//坐標數值樣式
    xAxis.valueFormatter = valueFormatter;
    xAxis.labelCount = 7;

4.Y軸樣式設置

NSNumberFormatter *leftAxisFormatter = [[NSNumberFormatter alloc] init];//坐標數值樣式
    leftAxisFormatter.maximumFractionDigits = 1;//Y軸坐標最多為1位小數
    ChartYAxis *leftAxis = _chartView.leftAxis;
    leftAxis.drawZeroLineEnabled = YES;//從0開始繪畫
    leftAxis.axisMaximum = 60;//最大值
    leftAxis.axisMinimum = 0;//最小值
    leftAxis.valueFormatter = [[ChartDefaultAxisValueFormatter alloc] initWithFormatter:leftAxisFormatter];
    leftAxis.labelFont = [UIFont systemFontOfSize:10.f];//字體大小
    leftAxis.labelPosition = YAxisLabelPositionOutsideChart;//坐標數值的位置
    leftAxis.labelCount = 8;//數值分割個數
    leftAxis.labelTextColor = [UIColor blackColor];//坐標數值字體顏色
    leftAxis.spaceTop = 0.15;//最大值到頂部的范圍比
    leftAxis.drawGridLinesEnabled = YES;//是否繪制網格
    leftAxis.axisLineWidth = 1;//Y軸線寬
    leftAxis.axisLineColor = [UIColor blackColor];//Y軸顏色

    ChartYAxis *right = _chartView.rightAxis;
    right.drawLabelsEnabled = NO;//是否顯示Y軸坐標
    right.drawGridLinesEnabled = NO;//不繪制網格

5.marker設置

點擊條柱時的數據展示，ChartsDemo中包含BalloonMarker類

BalloonMarker *marker = [[BalloonMarker alloc]
                             initWithColor: [UIColor colorWithWhite:180/255. alpha:1.0]
                             font: [UIFont systemFontOfSize:12.0]
                             textColor: UIColor.whiteColor
                             insets: UIEdgeInsetsMake(4.0, 4.0, 10.0, 4.0)];
    marker.chartView = _chartView;
    marker.minimumSize = CGSizeMake(40.f, 20.f);
    _chartView.marker = marker;

設置動畫

[_chartViewanimateWithYAxisDuration:1.0f];

ChartLimitLine類即可添加限制線，使用可參考ChartsDemo

三、data設置

- (void)setDataCount:(int)count {

    NSMutableArray *yVals = [[NSMutableArray alloc] init];
    for (int i = 0; i < count; i++) {
        int val = (double) (arc4random_uniform(60))+2;
        [yVals addObject:[[BarChartDataEntry alloc] initWithX:i y:val]];
    }

    BarChartDataSet *set1 = [[BarChartDataSet alloc] initWithValues:yVals label:@"DataSet"];
    [set1 setColor:[UIColor grayColor]];//bar的顏色
    [set1 setValueTextColor: [UIColor lightGrayColor]];
//    [set1 setDrawValuesEnabled:NO];//是否在bar上顯示數值
//    [set1 setHighlightEnabled:NO];//是否點擊有高亮效果，為NO是不會顯示marker的效果

    NSMutableArray *dataSets = [[NSMutableArray alloc] init];
    [dataSets addObject:set1];
    BarChartData *data = [[BarChartData alloc] initWithDataSets:dataSets];
    [data setValueFont:[UIFont systemFontOfSize:10]];
    self.chartView.data = data;
    [self.chartView notifyDataSetChanged];

}

四、實現barChartView的代理方法

1.點擊選中時的代理

- (void)chartValueSelected:(ChartViewBase * __nonnull)chartView entry:(ChartDataEntry * __nonnull)entry highlight:(ChartHighlight * __nonnull)highlight{
    NSLog(@"chartValueSelected");
}

2.沒有選中時的代理

- (void)chartValueNothingSelected:(ChartViewBase * __nonnull)chartView{
    NSLog(@"chartValueNothingSelected");
}

3.捏合放大或縮小

- (void)chartScaled:(ChartViewBase * _Nonnull)chartView scaleX:(CGFloat)scaleX scaleY:(CGFloat)scaleY {
    NSLog(@"---chartScaled---scaleX:%g, scaleY:%g", scaleX, scaleY);
}

4.拖拽圖表時的代理方法

- (void)chartTranslated:(ChartViewBase * _Nonnull)chartView dX:(CGFloat)dX dY:(CGFloat)dY {
    NSLog(@"---chartTranslated---dX:%g, dY:%g", dX, dY);
}

效果：

效果圖

 

來自：http://www.jianshu.com/p/e60acab520b4