我正在尝试使用Core Plot在iPad上创建三种投资方案的图表。
我正在使用Xcode 5，iPad 4和iOS 7。
基本前提是用户输入三种不同投资的初始投资和利率，单击按钮后，将显示第二个视图，显示同一绘图空间中每个场景的核心绘图散点图表示。 / p>
我的问题是，当我在iPad（实际设备）上运行应用程序时，生成的图形只有等于y = 0的图形（这就是显示的内容，我无法发布图片，因为堆栈溢出需要更高的声誉）
然而，在Xcode的iPad模拟器中，图表显示正确，我使用从初始数据视图输入的数据设置了方程式。
我有两个带有两个独立视图控制器的UIView。一个用于我的数据，一个用于我的图形显示。 我的代码如下：
DataViewController.h
#import <UIKit/UIKit.h>
@interface DataViewController : UIViewController
@property (weak, nonatomic) IBOutlet UITextField *principalOneText;
@property (weak, nonatomic) IBOutlet UITextField *rateOneText;
@property (weak, nonatomic) IBOutlet UITextField *principalTwoText;
@property (weak, nonatomic) IBOutlet UITextField *rateTwoText;
@property (weak, nonatomic) IBOutlet UITextField *principalThreeText;
@property (weak, nonatomic) IBOutlet UITextField *rateThreeText;
@property (weak, nonatomic) IBOutlet UIButton *ViewGraphButton;
- (IBAction)HideKeyboard:(id)sender;
@end
和DataViewController.m
#import "DataViewController.h"
@interface DataViewController ()
@end
@implementation DataViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)HideKeyboard:(id)sender {
[self.principalOneText resignFirstResponder];
[self.rateOneText resignFirstResponder];
[self.principalTwoText resignFirstResponder];
[self.rateTwoText resignFirstResponder];
[self.principalThreeText resignFirstResponder];
[self.rateThreeText resignFirstResponder];
}
@end
GraphViewController.h
#import <UIKit/UIKit.h>
#import "CorePlot-CocoaTouch.h"
#import "DataViewController.h"
#import <QuartzCore/QuartzCore.h>
@interface GraphViewController : UIViewController <CPTPlotDataSource>
@property (weak, nonatomic) NSString *principalOne;
@property (weak, nonatomic) NSString *rateOne;
@property (weak, nonatomic) NSString *principalTwo;
@property (weak, nonatomic) NSString *rateTwo;
@property (weak, nonatomic) NSString *principalThree;
@property (weak, nonatomic) NSString *rateThree;
- (IBAction)foundSwipe:(id)sender;
@end
和GraphViewController.m
#import "GraphViewController.h"
@interface GraphViewController ()
@end
@implementation GraphViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Transfer values from text boxes in Data Scene to the data holders in Graph Scene
self.principalOne = ((DataViewController *)self.presentingViewController).principalOneText.text;
self.rateOne = ((DataViewController *)self.presentingViewController).rateOneText.text;
self.principalTwo= ((DataViewController *)self.presentingViewController).principalTwoText.text;
self.rateTwo = ((DataViewController *)self.presentingViewController).rateTwoText.text;
self.principalThree = ((DataViewController *)self.presentingViewController).principalThreeText.text;
self.rateThree = ((DataViewController *)self.presentingViewController).rateThreeText.text;
//create graph upon loading
//initialise the host-view
CPTGraphHostingView *hostView = [[CPTGraphHostingView alloc] initWithFrame:self.view.frame];
[self.view addSubview:hostView];
//initialize the graph
CPTXYGraph *graph = [[CPTXYGraph alloc] initWithFrame:self.view.bounds];
hostView.hostedGraph = graph;
graph.paddingTop = 25.0f;
//initialize the plot space
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace*) graph.defaultPlotSpace;
//[plotSpace setXRange:[CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0) length:CPTDecimalFromFloat(16)]];
//[plotSpace setYRange:[CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(80) length:CPTDecimalFromFloat(140)]];
//Initialize the plots (1,2, and 3)
CPTScatterPlot *plot1 = [[CPTScatterPlot alloc] initWithFrame:CGRectZero];
plot1.identifier = @"Investment #1";
CPTColor *plot1Color = [CPTColor redColor];
CPTScatterPlot *plot2 = [[CPTScatterPlot alloc] initWithFrame:CGRectZero];
plot2.identifier = @"Investment #2";
CPTColor *plot2Color = [CPTColor blueColor];
CPTScatterPlot *plot3 = [[CPTScatterPlot alloc] initWithFrame:CGRectZero];
plot3.identifier = @"Investment #3";
CPTColor *plot3Color = [CPTColor greenColor];
//plot 4 is a way to make sure that the automatic ranges include y=0
CPTScatterPlot *plot4 = [[CPTScatterPlot alloc] initWithFrame:CGRectZero];
plot4.identifier = @"Placeholder";
//define the datasource
plot1.dataSource = self;
plot2.dataSource = self;
plot3.dataSource = self;
plot4.dataSource = self;
//Combine elements with the graph method call
[graph addPlot:plot1 toPlotSpace:graph.defaultPlotSpace];
[graph addPlot:plot2 toPlotSpace:graph.defaultPlotSpace];
[graph addPlot:plot3 toPlotSpace:graph.defaultPlotSpace];
[graph addPlot:plot4 toPlotSpace:graph.defaultPlotSpace];
//graph title and theme setup
//graph.title = @"Future Values";
//graph.titlePlotAreaFrameAnchor = CPTRectAnchorTop;
CPTTheme *selectedTheme = [CPTTheme themeNamed:kCPTDarkGradientTheme];
[graph applyTheme:selectedTheme];
//auto-formats the ranges of the x and y coordinates depending on the data used
[plotSpace scaleToFitPlots:[NSArray arrayWithObjects:plot1, plot2, plot3, plot4, Nil]];
CPTMutablePlotRange *xRange = [plotSpace.xRange mutableCopy];
[xRange expandRangeByFactor:CPTDecimalFromCGFloat(1.1f)];
plotSpace.xRange = xRange;
CPTMutablePlotRange *yRange = [plotSpace.yRange mutableCopy];
[yRange expandRangeByFactor:CPTDecimalFromCGFloat(1.1f)];
plotSpace.yRange = yRange;
//Styles and symbols
//plot1
CPTMutableLineStyle *plot1LineStyle = [plot1.dataLineStyle mutableCopy];
plot1LineStyle.lineWidth = 2.5;
plot1LineStyle.lineColor = plot1Color;
plot1.dataLineStyle = plot1LineStyle;
CPTMutableLineStyle *plot1SymbolLineStyle = [CPTMutableLineStyle lineStyle];
plot1LineStyle.lineColor = plot1Color;
CPTPlotSymbol *plot1Symbol = [CPTPlotSymbol ellipsePlotSymbol];
plot1Symbol.fill = [CPTFill fillWithColor:plot1Color];
plot1Symbol.lineStyle = plot1SymbolLineStyle;
plot1Symbol.size = CGSizeMake(6.0f, 6.0f);
plot1.plotSymbol = plot1Symbol;
//plot2 style
CPTMutableLineStyle *plot2LineStyle = [plot2.dataLineStyle mutableCopy];
plot2LineStyle.lineWidth = 1.0;
plot2LineStyle.lineColor = plot2Color;
plot2.dataLineStyle = plot2LineStyle;
CPTMutableLineStyle *plot2SymbolLineStyle = [CPTMutableLineStyle lineStyle];
plot2SymbolLineStyle.lineColor = plot2Color;
CPTPlotSymbol *plot2Symbol = [CPTPlotSymbol starPlotSymbol];
plot2Symbol.fill = [CPTFill fillWithColor:plot2Color];
plot2Symbol.lineStyle = plot2SymbolLineStyle;
plot2Symbol.size = CGSizeMake(6.0f, 6.0f);
plot2.plotSymbol = plot2Symbol;
//plot3 style
CPTMutableLineStyle *plot3LineStyle = [plot3.dataLineStyle mutableCopy];
plot3LineStyle.lineWidth = 2.0;
plot3LineStyle.lineColor = plot3Color;
plot3.dataLineStyle = plot3LineStyle;
CPTMutableLineStyle *plot3SymbolLineStyle = [CPTMutableLineStyle lineStyle];
plot3SymbolLineStyle.lineColor = plot3Color;
CPTPlotSymbol *plot3Symbol = [CPTPlotSymbol diamondPlotSymbol];
plot3Symbol.fill = [CPTFill fillWithColor:plot3Color];
plot3Symbol.lineStyle = plot3SymbolLineStyle;
plot3Symbol.size = CGSizeMake(6.0f, 6.0f);
plot3.plotSymbol = plot3Symbol;
//axis styles and setup
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];
CPTMutableTextStyle *axisTextStyle = [[CPTMutableTextStyle alloc] init];
axisTextStyle.color = [CPTColor whiteColor];
axisTextStyle.fontName = @"Helvetica-Bold";
axisTextStyle.fontSize = 11.0f;
CPTMutableLineStyle *tickLineStyle = [CPTMutableLineStyle lineStyle];
tickLineStyle.lineColor = [CPTColor whiteColor];
tickLineStyle.lineWidth = 2.0f;
CPTMutableLineStyle *gridLineStyle = [CPTMutableLineStyle lineStyle];
tickLineStyle.lineColor = [CPTColor blackColor];
tickLineStyle.lineWidth = 1.0f;
//x axis setup
CPTXYAxisSet *axisSet = (CPTXYAxisSet *) hostView.hostedGraph.axisSet;
CPTAxis *x = axisSet.xAxis;
x.title = @"Number of Years";
x.titleTextStyle = axisTitleStyle;
x.titleOffset = 15.0f;
x.axisLineStyle = axisLineStyle;
x.labelingPolicy = CPTAxisLabelingPolicyAutomatic;
x.labelTextStyle = axisTextStyle;
x.preferredNumberOfMajorTicks = 15;
x.majorTickLineStyle = axisLineStyle;
x.majorTickLength = 4.0f;
x.tickDirection = CPTSignNegative;
//y axis setup
CPTAxis *y = axisSet.yAxis;
y.title = @"Value";
y.titleTextStyle = axisTitleStyle;
y.titleOffset = -20.0f;
y.axisLineStyle = axisLineStyle;
y.majorGridLineStyle = gridLineStyle;
y.labelingPolicy = CPTAxisLabelingPolicyAutomatic;
y.labelTextStyle = axisTextStyle;
y.labelOffset = 16.0f;
y.majorTickLineStyle = axisLineStyle;
y.preferredNumberOfMajorTicks = 10;
y.majorTickLength = 4.0f;
y.minorTickLength = 2.0f;
y.tickDirection = CPTSignPositive;
//create a legend
graph.legend = [CPTLegend legendWithGraph:graph];
graph.legendAnchor = CPTRectAnchorTop;
graph.legend.fill = [CPTFill fillWithColor:[CPTColor lightGrayColor]];
graph.legendDisplacement = CGPointMake(-200.0f, -50.0f);
}
-(NSUInteger) numberOfRecordsForPlot:(CPTPlot *)plot
{
return 15;
}
-(NSNumber *) numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)idx
{
int x = idx;
float principal1 = [self.principalOne floatValue];
float interest1 = [self.rateOne floatValue]/100;
float power1 = powf((1+(interest1)), x);
float principal2 = [self.principalTwo floatValue];
float interest2 = [self.rateTwo floatValue]/100;
float power2 = powf((1+(interest2)),x);
float principal3 = [self.principalThree floatValue];
float interest3 = [self.rateThree floatValue]/100;
float power3 = powf((1+(interest3)), x);
if (fieldEnum == CPTScatterPlotFieldX) {
return [NSNumber numberWithInt:x];
}
else if(fieldEnum == CPTScatterPlotFieldY){
if([plot.identifier isEqual:@"Investment #1"])
{
return [NSNumber numberWithFloat:principal1*power1];
}
else if([plot.identifier isEqual:@"Investment #2"])
{
return [NSNumber numberWithFloat:principal2 * power2];
}
else if([plot.identifier isEqual:@"Investment #3"])
{
return [NSNumber numberWithFloat:principal3 * power3];
}
else if ([plot.identifier isEqual:@"Placeholder"])
{
return [NSNumber numberWithFloat:0];
}
}
return [NSNumber numberWithFloat:0];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)foundSwipe:(id)sender {
[self dismissViewControllerAnimated:YES completion:nil];
}
@end
我错过了什么吗？为什么我的Xcode iPad模拟器图表和我实际设备上显示的图表之间存在差异？欢迎任何帮助或建议。