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自从我开始使用 Core Plot 1.4 以来，我在使用散点图时遇到了一些意想不到的结果。我一直在使用旧版本的 Core Plot，最近升级到 1.4。自从升级到此版本后，我的散点图无法正确渲染。它似乎只呈现第一个 x 轴刻度线。我尝试了几种不同的方法，但没有成功。这可能是我缺少的 1.4 中的新设置。有没有人对可能发生的事情有任何想法？我有一个我创建的示例项目，如果有人想尝试重新创建此行为，可以将其发布到 Github。

我附上了截图：

*旧版核心情节*

旧版 Core-Plot

*核心情节 1.4*

较新版本的 Core-Plot

这是一些示例代码

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

self.hostView = [(CPTGraphHostingView *) [CPTGraphHostingView alloc] initWithFrame:self.view.bounds];
self.hostView.allowPinchScaling = YES;
[self.view addSubview:self.hostView];


// 1 - Create the graph
CPTGraph *graph = [[CPTXYGraph alloc] initWithFrame:self.hostView.bounds];
//[graph applyTheme:[CPTTheme themeNamed:kCPTDarkGradientTheme]];
self.hostView.hostedGraph = graph;
// 2 - Set graph title
NSString *title = @"Portfolio Prices: April 2012";
graph.title = title;
// 3 - Create and set text style
CPTMutableTextStyle *titleStyle = [CPTMutableTextStyle textStyle];
titleStyle.color = [CPTColor whiteColor];
titleStyle.fontName = @"Helvetica-Bold";
titleStyle.fontSize = 16.0f;
graph.titleTextStyle = titleStyle;
graph.titlePlotAreaFrameAnchor = CPTRectAnchorTop;
graph.titleDisplacement = CGPointMake(0.0f, 10.0f);
// 4 - Set padding for plot area
[graph.plotAreaFrame setPaddingLeft:40.0f];
[graph.plotAreaFrame setPaddingRight:30.0f];
[graph.plotAreaFrame setPaddingBottom:30.0f];
// 5 - Enable user interactions for plot space
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
//plotSpace.delegate = self;

NSArray  *dataTimes = [[NSArray alloc] initWithObjects:@"12am", @"1am", @"2am", @"3am", @"4am", @"5am", @"6am", @"7am", @"8am", @"9am", @"10am", @"11am", @"12pm", @"1pm", @"2pm", @"3pm", @"4pm", @"5pm", @"6pm", @"7pm", @"8pm", @"9pm", @"10pm", @"11pm",nil];


// 1 - Create 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];
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;
// 2 - Get axis set
CPTXYAxisSet *axisSet = (CPTXYAxisSet *) self.hostView.hostedGraph.axisSet;
// 3 - Configure x-axis
CPTAxis *x = axisSet.xAxis;
x.title = @"Time of Day";
x.titleTextStyle = axisTitleStyle;
x.titleOffset = 15.0f;
x.axisLineStyle = axisLineStyle;
x.labelingPolicy = CPTAxisLabelingPolicyNone;
x.labelTextStyle = axisTextStyle;
x.majorTickLineStyle = axisLineStyle;
x.majorTickLength = 4.0f;
x.tickDirection = CPTSignNegative;
//CGFloat dateCount = [[[CPDStockPriceStore sharedInstance] datesInMonth] count];
NSMutableSet *xLabels = [NSMutableSet setWithCapacity:dataTimes];
NSMutableSet *xLocations = [NSMutableSet setWithCapacity:dataTimes];
NSInteger i = 0;
for (NSString *time in dataTimes) {
    CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:time  textStyle:x.labelTextStyle];
    CGFloat location = i++;
    label.tickLocation = CPTDecimalFromCGFloat(location);
    label.offset = x.majorTickLength;
    if (label) {
        [xLabels addObject:label];
        [xLocations addObject:[NSNumber numberWithFloat:location]];
    }
}
x.axisLabels = xLabels;
x.majorTickLocations = xLocations;

// 4 - Configure y-axis
CPTAxis *y = axisSet.yAxis;
y.title = @"Price";
y.titleTextStyle = axisTitleStyle;
y.titleOffset = -40.0f;
y.axisLineStyle = axisLineStyle;
y.majorGridLineStyle = gridLineStyle;
y.labelingPolicy = CPTAxisLabelingPolicyNone;
y.labelTextStyle = axisTextStyle;
y.labelOffset = 16.0f;
y.majorTickLineStyle = axisLineStyle;
y.majorTickLength = 4.0f;
y.minorTickLength = 2.0f;
y.tickDirection = CPTSignPositive;
NSInteger majorIncrement = 100;
NSInteger minorIncrement = 50;
CGFloat yMax = 700.0f;  // should determine dynamically based on max price
NSMutableSet *yLabels = [NSMutableSet set];
NSMutableSet *yMajorLocations = [NSMutableSet set];
NSMutableSet *yMinorLocations = [NSMutableSet set];
for (NSInteger j = minorIncrement; j <= yMax; j += minorIncrement) {
    NSUInteger mod = j % majorIncrement;
    if (mod == 0) {
        CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:[NSString stringWithFormat:@"%i", j] textStyle:y.labelTextStyle];
        NSDecimal location = CPTDecimalFromInteger(j);
        label.tickLocation = location;
        label.offset = -y.majorTickLength - y.labelOffset;
        if (label) {
            [yLabels addObject:label];
        }
        [yMajorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:location]];
    } else {
        [yMinorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromInteger(j)]];
    }
}
y.axisLabels = yLabels;    
y.majorTickLocations = yMajorLocations;
y.minorTickLocations = yMinorLocations;

}
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