我从示例“CPTTestApp-iPhone”中获取了代码。应通过调用一种方法来绘制完整的图。我刚刚更改了 HostingView 的实现。它通过“addSubview”添加到另一个视图。
轴工作完美,但没有显示图表。
与财产
@property (nonatomic, strong) CPTGraphHostingView *HostingView;
绘制情节的方法
-(void)createPlot{
CGRect frame = CGRectMake(0,0,500,500);
self.HostingView = [(CPTGraphHostingView *) [CPTGraphHostingView alloc] initWithFrame:frame];
CPTXYGraph *graph = [[CPTXYGraph alloc] initWithFrame:CGRectZero];
CPTTheme *theme = [CPTTheme themeNamed:kCPTDarkGradientTheme];
[graph applyTheme:theme];
self.HostingView.hostedGraph = graph;
[self.AnotherView addSubview:self.HostingView];
// Create graph from theme
graph.paddingLeft = 10.0;
graph.paddingTop = 10.0;
graph.paddingRight = 10.0;
graph.paddingBottom = 10.0;
// Setup plot space
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.0) length:CPTDecimalFromFloat(2.0)];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.0) length:CPTDecimalFromFloat(3.0)];
// Axes
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
CPTXYAxis *x = axisSet.xAxis;
x.majorIntervalLength = CPTDecimalFromString(@"0.5");
x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"2");
x.minorTicksPerInterval = 2;
NSArray *exclusionRanges = [NSArray arrayWithObjects:
[CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.99) length:CPTDecimalFromFloat(0.02)],
[CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.99) length:CPTDecimalFromFloat(0.02)],
[CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(2.99) length:CPTDecimalFromFloat(0.02)],
nil];
x.labelExclusionRanges = exclusionRanges;
CPTXYAxis *y = axisSet.yAxis;
y.majorIntervalLength = CPTDecimalFromString(@"0.5");
y.minorTicksPerInterval = 5;
y.orthogonalCoordinateDecimal = CPTDecimalFromString(@"2");
exclusionRanges = [NSArray arrayWithObjects:
[CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(1.99) length:CPTDecimalFromFloat(0.02)],
[CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0.99) length:CPTDecimalFromFloat(0.02)],
[CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(3.99) length:CPTDecimalFromFloat(0.02)],
nil];
y.labelExclusionRanges = exclusionRanges;
y.delegate = self;
// Create a blue plot area
CPTScatterPlot *boundLinePlot = [[CPTScatterPlot alloc] init];
CPTMutableLineStyle *lineStyle = [CPTMutableLineStyle lineStyle];
lineStyle.miterLimit = 1.0f;
lineStyle.lineWidth = 3.0f;
lineStyle.lineColor = [CPTColor blueColor];
boundLinePlot.dataLineStyle = lineStyle;
boundLinePlot.identifier = @"Blue Plot";
boundLinePlot.dataSource = self;
[graph addPlot:boundLinePlot];
// Do a blue gradient
CPTColor *areaColor1 = [CPTColor colorWithComponentRed:0.3 green:0.3 blue:1.0 alpha:0.8];
CPTGradient *areaGradient1 = [CPTGradient gradientWithBeginningColor:areaColor1 endingColor:[CPTColor clearColor]];
areaGradient1.angle = -90.0f;
CPTFill *areaGradientFill = [CPTFill fillWithGradient:areaGradient1];
boundLinePlot.areaFill = areaGradientFill;
boundLinePlot.areaBaseValue = [[NSDecimalNumber zero] decimalValue];
// Add plot symbols
CPTMutableLineStyle *symbolLineStyle = [CPTMutableLineStyle lineStyle];
symbolLineStyle.lineColor = [CPTColor blackColor];
CPTPlotSymbol *plotSymbol = [CPTPlotSymbol ellipsePlotSymbol];
plotSymbol.fill = [CPTFill fillWithColor:[CPTColor blueColor]];
plotSymbol.lineStyle = symbolLineStyle;
plotSymbol.size = CGSizeMake(10.0, 10.0);
boundLinePlot.plotSymbol = plotSymbol;
// Create a green plot area
CPTScatterPlot *dataSourceLinePlot = [[CPTScatterPlot alloc] init];
lineStyle = [CPTMutableLineStyle lineStyle];
lineStyle.lineWidth = 3.f;
lineStyle.lineColor = [CPTColor greenColor];
lineStyle.dashPattern = [NSArray arrayWithObjects:[NSNumber numberWithFloat:5.0f], [NSNumber numberWithFloat:5.0f], nil];
dataSourceLinePlot.dataLineStyle = lineStyle;
dataSourceLinePlot.identifier = @"Green Plot";
dataSourceLinePlot.dataSource = self;
// Put an area gradient under the plot above
CPTColor *areaColor = [CPTColor colorWithComponentRed:0.3 green:1.0 blue:0.3 alpha:0.8];
CPTGradient *areaGradient = [CPTGradient gradientWithBeginningColor:areaColor endingColor:[CPTColor clearColor]];
areaGradient.angle = -90.0f;
areaGradientFill = [CPTFill fillWithGradient:areaGradient];
dataSourceLinePlot.areaFill = areaGradientFill;
dataSourceLinePlot.areaBaseValue = CPTDecimalFromString(@"1.75");
// Animate in the new plot, as an example
dataSourceLinePlot.opacity = 0.0f;
[graph addPlot:dataSourceLinePlot];
CABasicAnimation *fadeInAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
fadeInAnimation.duration = 1.0f;
fadeInAnimation.removedOnCompletion = NO;
fadeInAnimation.fillMode = kCAFillModeForwards;
fadeInAnimation.toValue = [NSNumber numberWithFloat:1.0];
[dataSourceLinePlot addAnimation:fadeInAnimation forKey:@"animateOpacity"];
// Add some initial data
NSMutableArray *contentArray = [NSMutableArray arrayWithCapacity:100];
NSUInteger i;
for ( i = 0; i < 60; i++ ) {
id x = [NSNumber numberWithFloat:1 + i * 0.05];
id y = [NSNumber numberWithFloat:1.2 * rand() / (float)RAND_MAX + 1.2];
[contentArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:x, @"x", y, @"y", nil]];
}
self.dataForPlot = contentArray;
#ifdef PERFORMANCE_TEST
[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(changePlotRange) userInfo:nil repeats:YES];
#endif
}
和方法
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
return [dataForPlot count];
}
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex: (NSUInteger)index
{
...
}
-(BOOL)axis:(CPTAxis *)axis shouldUpdateAxisLabelsAtLocations:(NSSet *)locations
{
....
}