CorePlot学习 使用技巧

corePlot 使用技巧：

//设置内边距：
graph.plotAreaFrame.paddingLeft   +=5;
graph.plotAreaFrame.paddingTop    +=5;
graph.plotAreaFrame.paddingRight  +=5;
graph.plotAreaFrame.paddingBottom +=17.5;

[self setAllowPinchScaling:NO];//禁止缩放

//设置坐标只能按照X轴横向滑动：（其他方向请自行理解）
plotSpace.yRange = [CPTPlotRangeplotRangeWithLocation:CPTDecimalFromInt(0)length:CPTDecimalFromFloat(1)];

plotSpace.globalYRange = [CPTPlotRangeplotRangeWithLocation:CPTDecimalFromInt(0)length:CPTDecimalFromFloat(1)];

plotSpace.xRange = [CPTPlotRangeplotRangeWithLocation:CPTDecimalFromInt(1)length:CPTDecimalFromFloat(1)];

plotSpace.globalXRange = [CPTPlotRangeplotRangeWithLocation:CPTDecimalFromInt(0)length:CPTDecimalFromFloat(2)];

//自定义轴label：
x.axisLabels          = [self buildLabelTitle];

x.labelingPolicy      = CPTAxisLabelingPolicyNone;//当设置这个Policy之后，坐标轴label及背景线tick都需要自己绘制，否则显示为空，请不要过度惊慌

x.minorTickLocations  = [NSSetsetWithArray:locationLabels];

- (NSMutableSet*)buildLabelTitle

{

    NSMutableSet *newAxisLabels = [NSMutableSetset];

    CPTMutableTextStyle *textStyleB = [CPTMutableTextStyletextStyle];

    textStyleB.color = [CPTColorcolorWithComponentRed:CPTFloat((float)0x09/0xFF)green:CPTFloat((float)0x31/0xFF)blue:CPTFloat((float)0x4A/0xFF)alpha:CPTFloat(1.0)];

    int n = 1;

    for ( NSUInteger i =30; i > 0; i--)

    {

        CPTAxisLabel *newLabel = [[CPTAxisLabelalloc] initWithText:@“这里是内容”

                                                          textStyle:textStyleB];

        newLabel.tickLocation =CPTDecimalFromUnsignedInteger(n++);

        newLabel.offset = 5;

        [locationLabels addObject:[NSNumber numberWithFloat:(n-1) -0.25]];

        [locationLabels addObject:[NSNumber numberWithFloat:(n-1) +0.25]];

        [newAxisLabels addObject:newLabel];

        [newLabel release];

    }

    return newAxisLabels;

}

//刷新图表内容：
[[bar1graph] reloadData];