此核心情节创建自：http ://codejunkster.wordpress.com/2011/11/23/core-plot-2-bar-plot/#comment-85 。我用相同的代码创建了 2 个应用程序，一个用于 iPhone，另一个用于 iPad。iphone 应用程序运行良好，但 ipad 应用程序显示 x 坐标和 y 坐标以及标题而不是列我不知道如何修复它。请帮助我。这将是一个很大的帮助。使用 Xcode 4.5.2 ios6。在此先感谢。
BarPlotViewController.h
#import <UIKit/UIKit.h>
#import "CorePlot-CocoaTouch.h"
@interface BarPlotViewController : UIViewController
<CPTBarPlotDataSource, CPTBarPlotDelegate>
@property (nonatomic, retain) NSMutableArray *data;
@property (nonatomic, retain) CPTGraphHostingView *hostingView;
@property (nonatomic, retain) CPTXYGraph *graph;
- (void) generateBarPlot;
@end
BarPlotViewController.m
#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)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.yRange = [CPTPlotRange plotRangeWithLocation:
CPTDecimalFromFloat(AXIS_START)
length:CPTDecimalFromFloat((AXIS_END - AXIS_START)+5)];
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)self.graph.axisSet;
//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 = @"CHOCOLATE";
axisSet.yAxis.title = @"AWESOMENESS";
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;
}
-(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"]]];
label.textStyle =textStyle;
return label;
}
CPTTextLayer *defaultLabel = [[CPTTextLayer alloc] initWithText:@"Label"];
return defaultLabel;
}
-(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]];
}
- (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.
}
@end
AppDelegate.h
#import <UIKit/UIKit.h>
#import "BarPlotViewController.h"
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) BarPlotViewController *barPlotViewController;
@end
AppDelegate.m
#import "AppDelegate.h"
@implementation AppDelegate
@synthesize window = _window;
@synthesize barPlotViewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor];
barPlotViewController = [[BarPlotViewController alloc] init];
[self.window setRootViewController:barPlotViewController];
[self.window makeKeyAndVisible];
return YES;
}
@end
Ipad 上的模拟器图片： 
这是它在 iphone 相同代码上的外观：