我在我的项目中有一个CorePlot的实现，虽然我在Xcode中没有相关的错误或警告，但是没有成功地让图表显示在图表中。轴和图表显示正常，但图中没有条形。
任何帮助或建议都将不胜感激！
标题文件
#import <UIKit/UIKit.h>
#import "PresentedViewControllerDelegate.h"
#import <CorePlot/ios/CorePlot.h>
@interface DeviceDetailModal : UIViewController <PresentedViewControllerDelegate, UIWebViewDelegate, UITableViewDataSource, UITableViewDelegate, CPTPlotDataSource,CPTBarPlotDelegate>{
CPTGraph *graph;
}
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (nonatomic, weak) id <PresentedViewControllerDelegate> delegate;
@property (strong,nonatomic) NSArray *dataSet;
@property (nonatomic, strong) CPTBarPlot *aaplPlot;
@property (nonatomic, strong) CPTPlotSpaceAnnotation *priceAnnotation;
@end
主要文件
#import <Foundation/Foundation.h>
#import "DeviceDetailModal.h"
#import "DetailCell.h"
#import <CorePlot/ios/CorePlot.h>
#import "Constants.h"
@implementation DeviceDetailModal
NSString * const CPDTickerSymbolAAPL = @"AAPL";
CGFloat const CPDBarWidth = 0.25f;
CGFloat const CPDBarInitialX = 0.25f;
@synthesize aaplPlot = aaplPlot_;
-(void)viewDidLoad{
[super viewDidLoad];
[self.view setBackgroundColor:[UIColor colorWithRed:0.03 green:0.06 blue:0.10 alpha:1.0]];
UIBarButtonItem *closeButton = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStylePlain target:self action:@selector(closeView)];
self.navigationItem.leftBarButtonItem = closeButton;
[[UIBarButtonItem appearance] setTintColor:[UIColor lightGrayColor]];
[[UINavigationBar appearance] setBarTintColor:[UIColor blackColor]];
self.tableView.layer.cornerRadius = 10.0;
self.tableView.layer.borderWidth = 0.7;
self.tableView.layer.borderColor = [UIColor whiteColor].CGColor;
self.tableView.opaque = NO;
self.tableView.backgroundColor = [UIColor clearColor];
self.tableView.backgroundView = nil;
self.dataSet = [[NSArray alloc] init];
self.dataSet = [NSArray arrayWithObjects:
[NSDecimalNumber numberWithFloat:571.70],
[NSDecimalNumber numberWithFloat:560.28],
[NSDecimalNumber numberWithFloat:610.00],
[NSDecimalNumber numberWithFloat:607.70],
[NSDecimalNumber numberWithFloat:603.00],
nil];
[self configureGraph];
[graph reloadData];
}
-(void)configureGraph {
CGRect hostingRect = CGRectMake(20, 350, 335, 310);
CPTGraphHostingView *hostingView = [[CPTGraphHostingView alloc] initWithFrame:hostingRect];
[self.view addSubview:hostingView];
[hostingView setBackgroundColor:[UIColor colorWithRed:0.03 green:0.06 blue:0.10 alpha:1.0]];
hostingView.layer.cornerRadius = 10.0;
hostingView.layer.borderWidth = 0.7;
hostingView.layer.borderColor = [UIColor whiteColor].CGColor;
graph = [[CPTXYGraph alloc] initWithFrame:hostingView.bounds];
hostingView.hostedGraph = graph;
[[graph defaultPlotSpace] setAllowsUserInteraction:TRUE];
// 1 - Create the graph
graph.plotAreaFrame.masksToBorder = NO;
// 2 - Configure the graph
//[graph applyTheme:[CPTTheme themeNamed:kCPTPlainBlackTheme]];
graph.paddingBottom = 30.0f;
graph.paddingLeft = 30.0f;
graph.paddingTop = -1.0f;
graph.paddingRight = -5.0f;
// 3 - Set up styles
CPTMutableTextStyle *titleStyle = [CPTMutableTextStyle textStyle];
titleStyle.color = [CPTColor whiteColor];
titleStyle.fontName = @"Helvetica-Bold";
titleStyle.fontSize = 16.0f;
// 4 - Set up title
NSString *title = @"Portfolio Prices: April 23 - 27, 2012";
graph.title = title;
graph.titleTextStyle = titleStyle;
graph.titlePlotAreaFrameAnchor = CPTRectAnchorTop;
graph.titleDisplacement = CGPointMake(0.0f, -16.0f);
// 5 - Set up plot space
CGFloat xMin = 0.0f;
CGFloat xMax = 7;
CGFloat yMin = 0.0f;
CGFloat yMax = 800.0f; // should determine dynamically based on max price
NSNumber *xAxisStart = [NSNumber numberWithFloat:xMin];
NSNumber *xAxisLength = [NSNumber numberWithDouble:xMax];
NSNumber *yAxisStart = [NSNumber numberWithFloat:yMin];
NSNumber *yAxisLength = [NSNumber numberWithDouble:yMax];
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:xAxisStart length:xAxisLength];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:yAxisStart length:yAxisLength];
// 1 - Set up the three plots
self.aaplPlot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor redColor] horizontalBars:NO];
self.aaplPlot.identifier = CPDTickerSymbolAAPL;
// 2 - Set up line style
CPTMutableLineStyle *barLineStyle = [[CPTMutableLineStyle alloc] init];
barLineStyle.lineColor = [CPTColor lightGrayColor];
barLineStyle.lineWidth = 0.5;
// 3 - Add plots to graph
graph = hostingView.hostedGraph;
CGFloat barX = CPDBarInitialX;
NSArray *plots = [NSArray arrayWithObjects:self.aaplPlot, nil];
for (CPTBarPlot *plot in plots) {
plot.dataSource = self;
plot.delegate = self;
plot.barWidth = [NSNumber numberWithFloat:CPDBarWidth];
plot.barOffset = [NSNumber numberWithFloat:barX];
plot.lineStyle = barLineStyle;
[graph addPlot:plot toPlotSpace:graph.defaultPlotSpace];
barX += CPDBarWidth;
}
// 1 - Configure styles
CPTMutableTextStyle *axisTitleStyle = [CPTMutableTextStyle textStyle];
axisTitleStyle.color = [CPTColor whiteColor];
axisTitleStyle.fontName = @"Helvetica-Bold";
axisTitleStyle.fontSize = 12.0f;
CPTMutableLineStyle *axisLineStyle = [CPTMutableLineStyle lineStyle];
axisLineStyle.lineWidth = 2.0f;
axisLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:1];
// 2 - Get the graph's axis set
CPTXYAxisSet *axisSet = (CPTXYAxisSet *) hostingView.hostedGraph.axisSet;
// 3 - Configure the x-axis
axisSet.xAxis.labelingPolicy = CPTAxisLabelingPolicyNone;
axisSet.xAxis.title = @"Days of Week (Mon - Fri)";
axisSet.xAxis.titleTextStyle = axisTitleStyle;
axisSet.xAxis.titleOffset = 10.0f;
axisSet.xAxis.axisLineStyle = axisLineStyle;
// 4 - Configure the y-axis
axisSet.yAxis.labelingPolicy = CPTAxisLabelingPolicyNone;
axisSet.yAxis.title = @"Price";
axisSet.yAxis.titleTextStyle = axisTitleStyle;
axisSet.yAxis.titleOffset = 5.0f;
axisSet.yAxis.axisLineStyle = axisLineStyle;
}
#pragma mark - CPTPlotDataSource methods
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot {
return [self.dataSet count];
}
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index {
NSLog(@"DATA: %@",[self.dataSet objectAtIndex:index]);
return [self.dataSet objectAtIndex:index];
}
#pragma mark - CPTBarPlotDelegate methods
-(void)barPlot:(CPTBarPlot *)plot barWasSelectedAtRecordIndex:(NSUInteger)index {
// 1 - Is the plot hidden?
if (plot.isHidden == YES) {
return;
}
// 2 - Create style, if necessary
static CPTMutableTextStyle *style = nil;
if (!style) {
style = [CPTMutableTextStyle textStyle];
style.color= [CPTColor yellowColor];
style.fontSize = 16.0f;
style.fontName = @"Helvetica-Bold";
}
// 3 - Create annotation, if necessary
NSNumber *price = [self numberForPlot:plot field:CPTBarPlotFieldBarTip recordIndex:index];
if (!self.priceAnnotation) {
NSNumber *x = [NSNumber numberWithInt:0];
NSNumber *y = [NSNumber numberWithInt:0];
NSArray *anchorPoint = [NSArray arrayWithObjects:x, y, nil];
self.priceAnnotation = [[CPTPlotSpaceAnnotation alloc] initWithPlotSpace:plot.plotSpace anchorPlotPoint:anchorPoint];
}
// 4 - Create number formatter, if needed
static NSNumberFormatter *formatter = nil;
if (!formatter) {
formatter = [[NSNumberFormatter alloc] init];
[formatter setMaximumFractionDigits:2];
}
// 5 - Create text layer for annotation
NSString *priceValue = [formatter stringFromNumber:price];
CPTTextLayer *textLayer = [[CPTTextLayer alloc] initWithText:priceValue style:style];
self.priceAnnotation.contentLayer = textLayer;
// 6 - Get plot index based on identifier
NSInteger plotIndex = 0;
if ([plot.identifier isEqual:CPDTickerSymbolAAPL] == YES) {
plotIndex = 0;
}
// 7 - Get the anchor point for annotation
CGFloat x = index + CPDBarInitialX + (plotIndex * CPDBarWidth);
NSNumber *anchorX = [NSNumber numberWithFloat:x];
CGFloat y = [price floatValue] + 40.0f;
NSNumber *anchorY = [NSNumber numberWithFloat:y];
self.priceAnnotation.anchorPlotPoint = [NSArray arrayWithObjects:anchorX, anchorY, nil];
// 8 - Add the annotation
[plot.graph.plotAreaFrame.plotArea addAnnotation:self.priceAnnotation];
}
@end
答案 0 :(得分：-1)
绘图范围以起始位置和长度给出。在您的情况下，将起始位置设为min值和长度max - min。现在没关系，因为min为零，但如果您更改min值，则长度将是错误的。
-numberForPlot:field:recordIndex:数据源方法必须检查字段参数并返回字段的正确值。返回index字段的CPTBarPlotFieldBarLocation参数值。返回dataSet字段的CPTBarPlotFieldBarTip数组中的值。