Iphone 核心图：仍然不了解如何使用自定义标签和记号

我有这个问题已经很久了，我找不到任何办法来解决这个问题。我读了几个论坛，但没有找到一个有效的解决办法。我有以下代码：

// Adjust graph using above data                
CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-10) length:CPDecimalFromFloat(xmax + 17)];
plotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-450) length:CPDecimalFromFloat(3750)];

// Setup axis
CPXYAxisSet *axisSet = (CPXYAxisSet *)graph.axisSet;
CPLineStyle *lineStyle = [CPLineStyle lineStyle];
lineStyle.lineColor = [CPColor whiteColor];
lineStyle.lineWidth = 1.0f;
CPTextStyle *cyanStyle = [CPTextStyle textStyle];
cyanStyle.color = [CPColor cyanColor];
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setMaximumFractionDigits:0];

// x axis with custom labels
axisSet.xAxis.labelingPolicy = CPAxisLabelingPolicyNone;
axisSet.xAxis.majorTickLineStyle = lineStyle;
axisSet.xAxis.axisLineStyle = lineStyle;
axisSet.xAxis.majorTickLength = 3.0f;
axisSet.xAxis.labelOffset = 3.0f;

axisSet.xAxis.visibleRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromInteger(0) length:CPDecimalFromInteger(xmax)];
axisSet.xAxis.labelExclusionRanges = [NSArray arrayWithObjects:
                                      [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(-10) 
                                                                  length:CPDecimalFromFloat(10)], 
                                      nil];

NSArray *customTickLocations = [NSArray arrayWithObjects:[NSDecimalNumber numberWithInt:0],
                                [NSDecimalNumber numberWithInt:6],
                                [NSDecimalNumber numberWithInt:12],
                                [NSDecimalNumber numberWithInt:18],
                                [NSDecimalNumber numberWithInt:24],
                                [NSDecimalNumber numberWithInt:30],
                                [NSDecimalNumber numberWithInt:36],
                                [NSDecimalNumber numberWithInt:41],                                             
                                [NSDecimalNumber numberWithInt:47],                                             
                                nil];

    // This return the labels (11h, 14h, ..., 22h, ..)
NSArray *xAxisLabels = [GPHelpers getHoursList:fromStr to:toStr];

NSUInteger labelLocation = 0;
NSMutableArray *customLabels = [NSMutableArray arrayWithCapacity:[xAxisLabels count]];
for (NSNumber *tickLocation in customTickLocations) {
    CPAxisLabel *newLabel = [[CPAxisLabel alloc] initWithText: [xAxisLabels objectAtIndex:labelLocation++] textStyle:axisSet.xAxis.labelTextStyle];
    newLabel.tickLocation = [tickLocation decimalValue];
    //newLabel.majorTickLocations = [tickLocation decimalValue];
    newLabel.offset = axisSet.xAxis.labelOffset + axisSet.xAxis.majorTickLength;                
    [customLabels addObject:newLabel];
    [newLabel release];
}
axisSet.xAxis.axisLabels =  [NSSet setWithArray:customLabels];

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我在x上看到了标签，但没有任何记号。

为了结束这个问题，我从一个核心绘图人员那里得到了答案：

只需设置勾号位置，添加以下语句：

axisSet.xAxis.majorTickLocations = [NSSet setWithArray:customTickLocations]; 

问候,，

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Luc

使用上面的代码，我看到了记号，但没有标签。你有什么建议吗？（@Cesare问）我必须在哪里添加这一行，我得到了相同的错误，我添加了5个标签，我只能在屏幕上看到2个标签，请帮助我解决这个问题，我已经花了很多时间。