L'aide de base de l'intrigue pour iPhone, date du tirage sur l'axe x

Ici, vous allez, DatePlot de travail sur iOS. N'oubliez pas de vérifier que correct.

- (void)viewDidLoad
{
[super viewDidLoad];
//Do any additional setup after loading the view from its nib.
//If you make sure your dates are calculated at noon, you shouldn't have to 
//worry about daylight savings. If you use midnight, you will have to adjust
//for daylight savings time.
NSDate *refDate = [NSDate dateWithTimeIntervalSinceReferenceDate:31556926 * 10];
NSTimeInterval oneDay = 24 * 60 * 60;
//Invert graph view to compensate for iOS coordinates
CGAffineTransform verticalFlip = CGAffineTransformMakeScale(1,-1);
self.view.transform = verticalFlip;
//allocate the graph within the current view bounds
graph = [[CPTXYGraph alloc] initWithFrame: self.view.bounds];
//assign theme to graph
CPTTheme *theme = [CPTTheme themeNamed:kCPTDarkGradientTheme];
[graph applyTheme:theme];
//Setting the graph as our hosting layer
CPTGraphHostingView *hostingView = [[CPTGraphHostingView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:hostingView];
hostingView.hostedGraph = graph;
graph.paddingLeft = 20.0;
graph.paddingTop = 20.0;
graph.paddingRight = 20.0;
graph.paddingBottom = 150.0;
//setup a plot space for the plot to live in
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
NSTimeInterval xLow = 0.0f;
//sets the range of x values
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(xLow)
length:CPTDecimalFromFloat(oneDay*5.0f)];
//sets the range of y values
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.0) 
length:CPTDecimalFromFloat(5)];
//plotting style is set to line plots
CPTMutableLineStyle *lineStyle = [CPTMutableLineStyle lineStyle];
lineStyle.lineColor = [CPTColor blackColor];
lineStyle.lineWidth = 2.0f;
//X-axis parameters setting
CPTXYAxisSet *axisSet = (id)graph.axisSet;
axisSet.xAxis.majorIntervalLength = CPTDecimalFromFloat(oneDay);
axisSet.xAxis.minorTicksPerInterval = 0;
axisSet.xAxis.orthogonalCoordinateDecimal = CPTDecimalFromString(@"1"); //added for date, adjust x line
axisSet.xAxis.majorTickLineStyle = lineStyle;
axisSet.xAxis.minorTickLineStyle = lineStyle;
axisSet.xAxis.axisLineStyle = lineStyle;
axisSet.xAxis.minorTickLength = 5.0f;
axisSet.xAxis.majorTickLength = 7.0f;
axisSet.xAxis.labelOffset = 3.0f;
//added for date
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
dateFormatter.dateStyle = kCFDateFormatterShortStyle;
CPTTimeFormatter *timeFormatter = [[[CPTTimeFormatter alloc] initWithDateFormatter:dateFormatter] autorelease];
timeFormatter.referenceDate = refDate;
axisSet.xAxis.labelFormatter = timeFormatter;
//Y-axis parameters setting    
axisSet.yAxis.majorIntervalLength = CPTDecimalFromString(@"0.5");
axisSet.yAxis.minorTicksPerInterval = 2;
axisSet.yAxis.orthogonalCoordinateDecimal = CPTDecimalFromFloat(oneDay); //added for date, adjusts y line
axisSet.yAxis.majorTickLineStyle = lineStyle;
axisSet.yAxis.minorTickLineStyle = lineStyle;
axisSet.yAxis.axisLineStyle = lineStyle;
axisSet.yAxis.minorTickLength = 5.0f;
axisSet.yAxis.majorTickLength = 7.0f;
axisSet.yAxis.labelOffset = 3.0f;
//This actually performs the plotting
CPTScatterPlot *xSquaredPlot = [[[CPTScatterPlot alloc] init] autorelease];
CPTMutableLineStyle *dataLineStyle = [CPTMutableLineStyle lineStyle];
//xSquaredPlot.identifier = @"X Squared Plot";
xSquaredPlot.identifier = @"Date Plot";
dataLineStyle.lineWidth = 1.0f;
dataLineStyle.lineColor = [CPTColor redColor];
xSquaredPlot.dataLineStyle = dataLineStyle;
xSquaredPlot.dataSource = self;
CPTPlotSymbol *greenCirclePlotSymbol = [CPTPlotSymbol ellipsePlotSymbol];
greenCirclePlotSymbol.fill = [CPTFill fillWithColor:[CPTColor greenColor]];
greenCirclePlotSymbol.size = CGSizeMake(2.0, 2.0);
xSquaredPlot.plotSymbol = greenCirclePlotSymbol;  
//add plot to graph
[graph addPlot:xSquaredPlot];
//Add some data
NSMutableArray *newData = [NSMutableArray array];
NSUInteger i;
for ( i = 0; i < 5; i++ ) {
NSTimeInterval x = oneDay*i;
id y = [NSDecimalNumber numberWithFloat:1.2*rand()/(float)RAND_MAX + 1.2];
[newData addObject:
[NSDictionary dictionaryWithObjectsAndKeys:
[NSDecimalNumber numberWithFloat:x], [NSNumber numberWithInt:CPTScatterPlotFieldX], 
y, [NSNumber numberWithInt:CPTScatterPlotFieldY], 
nil]];
NSLog(@"%@",newData);
}
plotData = [newData retain];
}
#pragma mark - Plot Data Source Methods
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
return plotData.count;
}
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
NSDecimalNumber *num = [[plotData objectAtIndex:index] objectForKey:[NSNumber numberWithInt:fieldEnum]];
return num;
}