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设置corePlot可拖动:
plotSpace.allowsUserInteraction = YES;
设置x显示的范围:
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInt(8 * oneDay)length:CPTDecimalFromInt(23 * oneDay)];
设置x轴拖动范围:
plotSpace.globalXRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInt(0) length:CPTDecimalFromInt(31 * oneDay)];
禁止corePlot缩放(Self是CPTGraphHostingView):
[self setAllowPinchScaling:NO];//禁止缩放
自定义label:
x.axisLabels = [self buildLabelTitle]; x.labelingPolicy = CPTAxisLabelingPolicyNone; //构建30天的label样式 - (NSMutableSet*)buildLabelTitle { NSMutableSet *newAxisLabels = [NSMutableSet set]; CPTMutableTextStyle *textStyleB = [CPTMutableTextStyle textStyle]; textStyleB.color = [CPTColor colorWithComponentRed:CPTFloat((float)0x09/0xFF) green:CPTFloat((float)0x31/0xFF) blue:CPTFloat((float)0x4A/0xFF) alpha:CPTFloat(1.0)]; NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease]; [dateFormatter setDateFormat:@"MM.dd"]; int n = 1; for ( NSUInteger i = 29; i > 0; i--) //从今起前29天 { NSTimeInterval secondsPerDay = 24 * 60 * 60 * i; NSDate *ago = [[NSDate alloc] initWithTimeIntervalSinceNow:-secondsPerDay]; CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText:[dateFormatter stringFromDate:ago] textStyle:textStyleB]; [ago release]; newLabel.tickLocation = CPTDecimalFromUnsignedInteger(n++ * oneDay); newLabel.offset = 5; [self.locationLabels addObject:[NSNumber numberWithInt:(n-1) * oneDay]]; [newAxisLabels addObject:newLabel]; [newLabel release]; } //今天 CPTMutableTextStyle *textStyleW = [CPTMutableTextStyle textStyle]; textStyleW.color = [CPTColor whiteColor]; CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText:@"今日" textStyle:textStyleW]; newLabel.tickLocation = CPTDecimalFromUnsignedInteger(oneDay * n); [self.locationLabels addObject:[NSNumber numberWithInt:(n) * oneDay]]; newLabel.offset = 5; [newAxisLabels addObject:newLabel]; [newLabel release]; return newAxisLabels; }
但是写好后发现majorGridLine不见了,之后各种折腾后终于找到原因是:
CPTAxisLabelingPolicyNone No labels provided; user sets labels and tick locations.
设置这个属性是要自己重新定义majorGridLine位置的
所以需要使用:
x.majorTickLocations = [NSSet setWithArray:locationLabels];
[转载]core-Plot学习二 自定义CorePlot label及majorGridLine莫名其妙消失的Bug
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原文地址:http://www.cnblogs.com/mins/p/4597314.html