blocks|key|4173831|text|不幸的是，考虑到框架的API还没有稳定下来，没有那么多的教程，而且已经存在的一些教程已经过时了。示例应用程序确实是了解如何使用框架的最佳资源。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4173832|例如，要提供定制轴标签，可以查看CPTestApp-iPhone的CPTestAppBarChartController.m源文件。该示例中的条形图具有由以下代码定义的自定义X轴标签：|offset|length|style|CODE|4173833|//+Define+some+custom+labels+for+the+data+elements
x.labelRotation+=+M_PI/4;
x.labelingPolicy+=+CPAxisLabelingPolicyNone;
NSArray+*customTickLocations+=+[NSArray+arrayWithObjects:[NSDecimalNumber+numberWithInt:1],+[NSDecimalNumber+numberWithInt:5],+[NSDecimalNumber+numberWithInt:10],+[NSDecimalNumber+numberWithInt:15],+nil];
NSArray+*xAxisLabels+=+[NSArray+arrayWithObjects:@"Label+A",+@"Label+B",+@"Label+C",+@"Label+D",+@"Label+E",+nil];
NSUInteger+labelLocation+=+0;
NSMutableArray+*customLabels+=+[NSMutableArray+arrayWithCapacity:[xAxisLabels+count]];
for+(NSNumber+*tickLocation+in+customTickLocations)+{
++++CPAxisLabel+*newLabel+=+[[CPAxisLabel+alloc]+initWithText:+[xAxisLabels+objectAtIndex:labelLocation%2B%2B]+textStyle:x.labelTextStyle];
++++newLabel.tickLocation+=+[tickLocation+decimalValue];
++++newLabel.offset+=+x.labelOffset+%2B+x.majorTickLength;
++++newLabel.rotation+=+M_PI/4;
++++[customLabels+addObject:newLabel];
++++[newLabel+release];
}

x.axisLabels+=++[NSSet+setWithArray:customLabels];|code-block|syntax|javascript|4173834|首先，将轴标签策略设置为CPAxisLabelingPolicyNone，以让框架知道您将提供自定义标签，然后创建一个标签数组及其相应位置，最后将该标签数组分配给X轴上的axisLabels属性。|4173835|entityMap^0|0|X|T|0|0|C|O|2D|A|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|U|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|V|8|@$D|W|E|X|F|G]|$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|P|$]]

Unfortunately, given the fact that the API of the framework has not yet stabilized, there aren't that many tutorials out there, and several of the ones that do exist are already outdated. The example applications really are the best sources to see how to work with the framework.

For example, to provide custom axis labels, take a look at the CPTestApp-iPhone's <code>CPTestAppBarChartController.m</code> source file. The bar chart in that example has custom X axis labels defined by the following code:

<pre><code>// Define some custom labels for the data elements
x.labelRotation = M_PI/4;
x.labelingPolicy = CPAxisLabelingPolicyNone;
NSArray *customTickLocations = [NSArray arrayWithObjects:[NSDecimalNumber numberWithInt:1], [NSDecimalNumber numberWithInt:5], [NSDecimalNumber numberWithInt:10], [NSDecimalNumber numberWithInt:15], nil];
NSArray *xAxisLabels = [NSArray arrayWithObjects:@"Label A", @"Label B", @"Label C", @"Label D", @"Label E", nil];
NSUInteger labelLocation = 0;
NSMutableArray *customLabels = [NSMutableArray arrayWithCapacity:[xAxisLabels count]];
for (NSNumber *tickLocation in customTickLocations) {
 CPAxisLabel *newLabel = [[CPAxisLabel alloc] initWithText: [xAxisLabels objectAtIndex:labelLocation++] textStyle:x.labelTextStyle];
 newLabel.tickLocation = [tickLocation decimalValue];
 newLabel.offset = x.labelOffset + x.majorTickLength;
 newLabel.rotation = M_PI/4;
 [customLabels addObject:newLabel];
 [newLabel release];
}

x.axisLabels = [NSSet setWithArray:customLabels];
</code></pre>

First, you set the axis labeling policy to <code>CPAxisLabelingPolicyNone</code> to let the framework know you will be providing custom labels, then you create an array of labels with their corresponding locations, and finally you assign that array of labels to the <code>axisLabels</code> property on the X axis.

blocks|key|4173841|text|若要提供自定义格式化标签，可以为轴的labelFormatter属性指定格式化程序。您可以使用根据您的首选项配置的NSNumberFormatter，例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4173842|NSNumberFormatter+*formatter+=+[[NSNumberFormatter+alloc]+init];
//+...+configure+formatter

CPTXYAxis+*y+=+axisSet.yAxis;
y.labelFormatter+=+formatter;|code-block|syntax|javascript|4173843|或者，如果需要更具体的格式设置，可以子类化NSNumberFormatter并覆盖stringForObjectValue:方法以执行所需的确切格式设置。|offset|length|style|CODE|4173844|entityMap^0|0|0|L|H|15|L|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

To provide custom formatted labels, you may assign a formatter to the labelFormatter property of an axis. You can either use the NSNumberFormatter configured to your preferences, e.g.:

<pre><code>NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
// ... configure formatter

CPTXYAxis *y = axisSet.yAxis;
y.labelFormatter = formatter;
</code></pre>

Or, if you need more specific formatting, you can subclass <code>NSNumberFormatter</code> and override the <code>stringForObjectValue:</code> method to do the exact formatting you would like.

I am using the Core Plot framework, and attempting to work through the example applications. Are there any tutorials for using this framework? 

Specifically, how do you provide labels for X and Y axes in a chart?

How do you provide labels for the axis of a Core Plot chart?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在使用Core Plot框架，并尝试完成示例应用程序。有没有使用这个框架的教程？具体地说，如何在图表中为X和Y轴提供标签？

问如何为核心绘图图表的轴提供标签？
EN

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问如何为核心绘图图表的轴提供标签？EN