coreplot中的x轴标签不显示
我附上了我正在使用的整个代码，但是x轴标签没有被生成。我不知道哪里出了问题。我是核心小区的noob。请帮助我。感谢提前和开心新的年。
#import "BarPlotViewController.h" @interface BarPlotViewController () @end @implementation BarPlotViewController #define BAR_POSITION @"POSITION" #define BAR_HEIGHT @"HEIGHT" #define COLOR @"COLOR" #define CATEGORY @"CATEGORY" #define AXIS_START 0 #define AXIS_END 50 // @synthesize data; @synthesize graph; @synthesize hostingView; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { self.data = [NSMutableArray array]; int bar_heights[] = {20,30,10,40}; UIColor *colors[] = { [UIColor redColor], [UIColor blueColor], [UIColor orangeColor], [UIColor purpleColor]}; NSString *categories[] = {@"Plain Milk", @"Milk + Caramel", @"White", @"Dark"}; for (int i = 0; i < 4 ; i++){ double position = i*10; //Bars will be 10 pts away from each other double height = bar_heights[i]; NSDictionary *bar = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithDouble:position],BAR_POSITION, [NSNumber numberWithDouble:height],BAR_HEIGHT, colors[i],COLOR, categories[i],CATEGORY, nil]; [self.data addObject:bar]; } [self generateBarPlot]; } return self; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (void)generateBarPlot { //Create host view self.hostingView = [[CPTGraphHostingView alloc] initWithFrame:[[UIScreen mainScreen]bounds]]; [self.view addSubview:self.hostingView]; //Create graph and set it as host view's graph self.graph = [[CPTXYGraph alloc] initWithFrame:self.hostingView.bounds]; [self.hostingView setHostedGraph:self.graph]; //set graph padding and theme self.graph.plotAreaFrame.paddingTop = 20.0f; self.graph.plotAreaFrame.paddingRight = 20.0f; self.graph.plotAreaFrame.paddingBottom = 70.0f; self.graph.plotAreaFrame.paddingLeft = 70.0f; [self.graph applyTheme:[CPTTheme themeNamed:kCPTDarkGradientTheme]]; //set axes ranges CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)self.graph.defaultPlotSpace; // plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(AXIS_START) length:CPTDecimalFromFloat((AXIS_END - AXIS_START)+5)]; // plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInt(-1) length:CPTDecimalFromInt(8)]; CPTXYAxisSet *axisSet = (CPTXYAxisSet *)self.graph.axisSet; //X labels int labelLocations = 0; NSMutableArray *customXLabels = [NSMutableArray array]; NSArray *dates = [NSArray arrayWithObjects:@"2012-05-01", @"2012-05-02", @"2012-05-03", @"2012-05-04", @"2012-05-05", @"2012-05-06", @"2012-05-07", nil]; for (NSString *day in dates) { CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText:day textStyle:axisSet.xAxis.labelTextStyle]; newLabel.tickLocation = [[NSNumber numberWithInt:labelLocations] decimalValue]; newLabel.offset = axisSet.xAxis.labelOffset + axisSet.xAxis.majorTickLength; // newLabel.rotation = M_PI / 4; [customXLabels addObject:newLabel]; labelLocations++; } axisSet.xAxis.axisLabels = [NSSet setWithArray:customXLabels]; plotSpace.yRange = [CPTPlotRange plotRangeWithLocation: CPTDecimalFromFloat(AXIS_START) length:CPTDecimalFromFloat((AXIS_END - AXIS_START)+5)]; //set axes' title, labels and their text styles CPTMutableTextStyle *textStyle = [CPTMutableTextStyle textStyle]; textStyle.fontName = @"Helvetica"; textStyle.fontSize = 14; textStyle.color = [CPTColor whiteColor]; axisSet.xAxis.title = @"Years"; axisSet.yAxis.title = @"Expenses"; axisSet.xAxis.titleTextStyle = textStyle; axisSet.yAxis.titleTextStyle = textStyle; axisSet.xAxis.titleOffset = 30.0f; axisSet.yAxis.titleOffset = 40.0f; axisSet.xAxis.labelTextStyle = textStyle; axisSet.xAxis.labelOffset = 3.0f; axisSet.yAxis.labelTextStyle = textStyle; axisSet.yAxis.labelOffset = 3.0f; //set axes' line styles and interval ticks CPTMutableLineStyle *lineStyle = [CPTMutableLineStyle lineStyle]; lineStyle.lineColor = [CPTColor whiteColor]; lineStyle.lineWidth = 3.0f; axisSet.xAxis.axisLineStyle = lineStyle; axisSet.yAxis.axisLineStyle = lineStyle; axisSet.xAxis.majorTickLineStyle = lineStyle; axisSet.yAxis.majorTickLineStyle = lineStyle; axisSet.xAxis.majorIntervalLength = CPTDecimalFromFloat(5.0f); axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(5.0f); axisSet.xAxis.majorTickLength = 7.0f; axisSet.yAxis.majorTickLength = 7.0f; axisSet.xAxis.minorTickLineStyle = lineStyle; axisSet.yAxis.minorTickLineStyle = lineStyle; axisSet.xAxis.minorTicksPerInterval = 1; axisSet.yAxis.minorTicksPerInterval = 1; axisSet.xAxis.minorTickLength = 5.0f; axisSet.yAxis.minorTickLength = 5.0f; // Create bar plot and add it to the graph CPTBarPlot *plot = [[CPTBarPlot alloc] init] ; plot.dataSource = self; plot.delegate = self; plot.barWidth = [[NSDecimalNumber decimalNumberWithString:@"5.0"] decimalValue]; plot.barOffset = [[NSDecimalNumber decimalNumberWithString:@"10.0"] decimalValue]; plot.barCornerRadius = 5.0; // Remove bar outlines CPTMutableLineStyle *borderLineStyle = [CPTMutableLineStyle lineStyle]; borderLineStyle.lineColor = [CPTColor clearColor]; plot.lineStyle = borderLineStyle; // Identifiers are handy if you want multiple plots in one graph plot.identifier = @"chocoplot"; [self.graph addPlot:plot]; } -(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot { if ( [plot.identifier isEqual:@"chocoplot"] ) return [self.data count]; return 0; } -(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index { if ( [plot.identifier isEqual:@"chocoplot"] ) { NSDictionary *bar = [self.data objectAtIndex:index]; if(fieldEnum == CPTBarPlotFieldBarLocation) return [bar valueForKey:BAR_POSITION]; else if(fieldEnum ==CPTBarPlotFieldBarTip) return [bar valueForKey:BAR_HEIGHT]; } return [NSNumber numberWithFloat:0]; } -(CPTLayer *)dataLabelForPlot:(CPTPlot *)plot recordIndex:(NSUInteger)index { if ( [plot.identifier isEqual: @"chocoplot"] ) { CPTMutableTextStyle *textStyle = [CPTMutableTextStyle textStyle]; textStyle.fontName = @"Helvetica"; textStyle.fontSize = 14; textStyle.color = [CPTColor whiteColor]; NSDictionary *bar = [self.data objectAtIndex:index]; // CPTTextLayer *label = [[CPTTextLayer alloc] initWithText:[NSString stringWithFormat:@"%@", [bar valueForKey:@"CATEGORY"]]]; CPTTextLayer *label = [[CPTTextLayer alloc] initWithText:[NSString stringWithFormat:@"%@", [bar valueForKey:@"HEIGHT"]]]; label.textStyle =textStyle; return label; } CPTTextLayer *defaultLabel = [[CPTTextLayer alloc] initWithText:@"Label"]; return defaultLabel; } -(void)barPlot:(CPTBarPlot *)plot barWasSelectedAtRecordIndex:(NSUInteger)index { NSLog(@"barWasSelectedAtRecordIndex %d", index); } -(CPTFill *)barFillForBarPlot:(CPTBarPlot *)barPlot recordIndex:(NSUInteger)index { if ( [barPlot.identifier isEqual:@"chocoplot"] ) { NSDictionary *bar = [self.data objectAtIndex:index]; CPTGradient *gradient = [CPTGradient gradientWithBeginningColor:[CPTColor whiteColor] endingColor:[bar valueForKey:@"COLOR"] beginningPosition:0.0 endingPosition:0.3 ]; [gradient setGradientType:CPTGradientTypeAxial]; [gradient setAngle:320.0]; CPTFill *fill = [CPTFill fillWithGradient:gradient]; return fill; } return [CPTFill fillWithColor:[CPTColor colorWithComponentRed:1.0 green:1.0 blue:1.0 alpha:1.0]]; } @end 绘制x轴标签的主要代码：这是x轴标签的代码：
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)self.graph.axisSet; //X labels int labelLocations = 0; NSMutableArray *customXLabels = [NSMutableArray array]; NSArray *dates = [NSArray arrayWithObjects:@"2012-05-01", @"2012-05-02", @"2012-05-03", @"2012-05-04", @"2012-05-05", @"2012-05-06", @"2012-05-07", nil]; for (NSString *day in dates) { CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText:day textStyle:axisSet.xAxis.labelTextStyle]; newLabel.tickLocation = [[NSNumber numberWithInt:labelLocations] decimalValue]; newLabel.offset = axisSet.xAxis.labelOffset + axisSet.xAxis.majorTickLength; // newLabel.rotation = M_PI / 4; [customXLabels addObject:newLabel]; labelLocations++; } axisSet.xAxis.axisLabels = [NSSet setWithArray:customXLabels];
你尝试过吗？ 你必须正确处理填充。
graph.plotAreaFrame.paddingBottom=40;