CorePlot：帶日期的x軸，僅顯示第一個日期標簽？

Question

我在x軸上有一個核心圖散點圖，其中有日期：

NSDateComponents *dateComponents = [[NSDateComponents alloc] init];

[dateComponents setMonth:10];
[dateComponents setDay:29];
[dateComponents setYear:2009];
[dateComponents setHour:12];
[dateComponents setMinute:0];
[dateComponents setSecond:0];
NSCalendar *gregorian = [[NSCalendar alloc]
                         initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *refDate = [gregorian dateFromComponents:dateComponents];
NSTimeInterval oneDay = 24 * 60 * 60;
CPTXYAxis *x          = axisSet.xAxis;
x.majorIntervalLength         = CPTDecimalFromFloat(oneDay);
x.orthogonalCoordinateDecimal = CPTDecimalFromString(@"2");
x.minorTicksPerInterval       = 0;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateStyle = kCFDateFormatterShortStyle;
CPTTimeFormatter *timeFormatter = [[CPTTimeFormatter alloc] initWithDateFormatter:dateFormatter];
timeFormatter.referenceDate = refDate;
x.labelFormatter            = timeFormatter;
x.labelRotation             = M_PI / 4;

但是x軸上僅顯示第一個日期：

使用以下代碼創建圖形的測試數據：

-(NSMutableArray *)testData{
    NSMutableArray *testArray = [NSMutableArray arrayWithCapacity:100];
    [testArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:0.0f], @"x", [NSNumber numberWithFloat:19.0f], @"y", nil]];
    [testArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:0.5f], @"x", [NSNumber numberWithFloat:20.0f], @"y", nil]];
    [testArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:1.0f], @"x", [NSNumber numberWithFloat:18.5f], @"y", nil]];
    [testArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:1.5f], @"x", [NSNumber numberWithFloat:19.5f], @"y", nil]];
    [testArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:2.0f], @"x", [NSNumber numberWithFloat:21.5f], @"y", nil]];
    [testArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:2.5f], @"x", [NSNumber numberWithFloat:20.5f], @"y", nil]];
    [testArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:3.0f], @"x", [NSNumber numberWithFloat:20.0f], @"y", nil]];
    [testArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:3.5f], @"x", [NSNumber numberWithFloat:20.5f], @"y", nil]];
    [testArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:4.0f], @"x", [NSNumber numberWithFloat:24.0f], @"y", nil]];
    [testArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:4.5f], @"x", [NSNumber numberWithFloat:23.5f], @"y", nil]];
    return testArray;
}

我的x軸出現問題或提供的數據不正確？

Answer 1

您的x值相隔0.5個單位，而主要刻度線oneDay （24 * 60 * 60 = 86,400）個單位。 如果x值應該是日期，則將當前值乘以oneDay並擴展繪圖空間的xRange以覆蓋更大范圍的值。