[英]Change the Y-axis labels and lines dynamically in core plot
我想动态更改Y轴。 我有最大和最小文本字段。 当我更改最大或最小字段时,图形将更改Y轴。
我已经尝试过像下面这样,但是只有两行。 请检查以下代码。
这是用于配置Y轴的方法。
CPTXYAxis *y = axisSet.yAxis;
y.labelingPolicy = CPTAxisLabelingPolicyNone;
y.axisLineStyle = axisLineStyle;
y.majorGridLineStyle = majorGridLineStyle;
y.minorGridLineStyle = minorGridLineStyle;
y.majorTickLength = 0.0;
NSMutableSet *yLabels = [NSMutableSet setWithCapacity:4];
NSMutableSet *yLocations = [NSMutableSet setWithCapacity:4];
NSUserDefaults *preferences = [NSUserDefaults standardUserDefaults];
CGFloat max_value = [[preferences valueForKey:MAX_KEY] integerValue];
CGFloat min_value = [[preferences valueForKey:MIN_KEY] integerValue];
NSLog(@"max_value%f",max_value);
NSInteger range = ((max_value-min_value)*10)/100;
NSLog(@"range%d",range);
newmaxValue = (max_value-min_value) - range;
newMinValue = min_value - range;
yAxisLabels = [NSArray arrayWithObjects:[NSString stringWithFormat:@"%.f",newMinValue], [NSString stringWithFormat:@"%.f",newMinValue+20],[NSString stringWithFormat:@"%.f",newmaxValue-20],[NSString stringWithFormat:@"%.f",newmaxValue], nil];
yAxiscustomTickLocations = [NSArray arrayWithObjects:[NSDecimalNumber numberWithInt:newMinValue], [NSDecimalNumber numberWithInt:newMinValue+20], [NSDecimalNumber numberWithInt:newmaxValue-20], [NSDecimalNumber numberWithInt:newmaxValue],nil];
NSNumberFormatter * nFormatter = [[NSNumberFormatter alloc] init];
[nFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
for ( NSUInteger i = 0; i < [yAxisLabels count]; i++ ) {
CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:[NSString stringWithFormat:@"%@",[yAxisLabels objectAtIndex:i]] textStyle:axisTextStyle];
label.tickLocation = CPTDecimalFromInteger([[yAxiscustomTickLocations objectAtIndex:i] integerValue]);
//label.offset = y.labelOffset + y.majorTickLength;
NSLog(@"%d",[[yAxiscustomTickLocations objectAtIndex:i] integerValue]);
label.offset = y.majorTickLength+2;
if (label) {
[yLabels addObject:label];
[yLocations addObject:[NSString stringWithFormat:@"%d",[[yAxiscustomTickLocations objectAtIndex:i] integerValue]]];
}
label = nil;
}
NSLog(@"newmaxValue%f",newmaxValue);
NSLog(@"newMinValue%f",newMinValue);
y.axisLabels = yLabels;
y.majorTickLocations = [NSSet setWithArray:yAxiscustomTickLocations];
y.visibleRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat((NSInteger)newMinValue) length:CPTDecimalFromFloat((NSInteger)newmaxValue)];
y.labelFormatter = nFormatter;
而且我正在设置这样的范围
[self getCoreplotSpace].xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromUnsignedInteger(0.0f) length:CPTDecimalFromUnsignedInteger(1800.0f)];
[self getCoreplotSpace].yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInteger((NSInteger)newMinValue) length:CPTDecimalFromInteger((NSInteger)newmaxValue)];
编辑::
登录输出
newmaxValue225.000000
newMinValue-75.000000
yAxisLabels(
"-75",
"-55",
205,
225
)
yAxiscustomTickLocations(
"-75",
"-55",
205,
225
)
你能帮我吗...
谢谢
您的问题是在最后指定y轴可见范围的地方:
y.visibleRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat((NSInteger)newMinValue) length:CPTDecimalFromFloat((NSInteger)newmaxValue)];
长度应该是范围,而不是newmaxValue:
y.visibleRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat((NSInteger)newMinValue) length:CPTDecimalFromFloat((NSInteger)(newmaxValue-newminValue))];
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