Question

我开始勇敢地尝试将JBChartView（特别是折线图）填充到我的应用程序中进行统计跟踪。我之前从未使用过图形库，但我尽力调查它们，这个看起来非常强大。问题是我无法从测试数据中正确使用图表。

当我运行下面的代码时，我得到[__NSCFConstantString objectAtIndex:] unrecognized selector sent to instance。有问题的行在verticalValueforHorizontalIndex，但我无法找到另一种产生任何数据的方法。有没有人有这方面的经验，或者任何人都可以帮我弄清楚为什么我在这里遇到这么多麻烦？

实施档案

#import "waterStatsViewController.h"
#import "JBLineChartView.h"
#import "JBChartView.h"
#import "JBBarChartView.h"
#import "JBChartHeaderView.h"
#import "JBLineChartFooterView.h"

typedef NS_ENUM(NSInteger, JBLineChartLine){
JBLineChartLineSolid,
JBLineChartLineDashed,
JBLineChartLineCount
};

@interface waterStatsViewController ()

- (void)initData;

@end

@implementation waterStatsViewController

- (id)init
{
self = [super init];
if (self)
{
   [self initData];
}
return self;
}

- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self)
{
    [self initData];
}
return self;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
{
    [self initData];
}
return self;
}

- (void) initData
{
// DEFINE ARRAYS
testArray1 = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9", @"10", nil];
testArray2 = [[NSArray alloc] initWithObjects:@"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9", @"10", nil];

// CREATE MUTABLE ARRAY FOR LINES IN CHART
NSMutableArray *mutableLineCharts = [NSMutableArray array];

// AS LONG AS LINEINDEX IS LESS THEN THE LINE COUNT, INCREASE THE LINE COUNT AND EXECUTE CODE
for (int lineIndex = 0; lineIndex<JBLineChartLineCount; lineIndex++)
{
    // CREATE MUTABLE ARRAY FOR DATA IN CHART
    NSMutableArray *mutableChartData = [NSMutableArray array];

    // AS LONG AS INT I IS LESS THEN THE COUNT OF OBJECTS IN TEST ARRAY 2; INCREASE COUNT AND EXECUTE CODE
    for (int i = 0; i < testArray2.count; i++)
    {
        // ADD OBJECTS FROM TEST ARRAY 2 TO CHART DATA
        [mutableChartData addObjectsFromArray:testArray2];
    }
    // TAKE OBJECTS FROM MUTABLE CHART DATA AND ADD THEM TO OHHHHHH FOR EACH ITEM YOU ADD ANOTHER LINE
    [mutableLineCharts addObjectsFromArray:mutableChartData];
}
}


- (void)viewDidLoad
{
self.title = @"Water Quality";

_chartView = [[JBLineChartView alloc] init];
_chartView.delegate = self;
_chartView.dataSource = self;
_chartView.state = 0;
_chartView.backgroundColor = [UIColor blackColor];
_chartView.showsLineSelection = YES;
_chartView.showsVerticalSelection = YES;

_headerView = [[JBChartHeaderView alloc]  initWithFrame:CGRectMake(0, 64, 320, 30)];
_chartView.frame = CGRectMake(0, 94, 320, 300);
 _footerView = [[JBLineChartFooterView alloc] initWithFrame:CGRectMake(0, 404, 320, 30)];

_headerView.titleLabel.text = @"Alkalinity";
_headerView.titleLabel.textColor = [UIColor whiteColor];

_footerView.leftLabel.text = [testArray1 firstObject];
_footerView.rightLabel.text = [testArray1 lastObject];
_footerView.leftLabel.textColor = [UIColor whiteColor];
_footerView.rightLabel.textColor = [UIColor whiteColor];
_footerView.backgroundColor = [UIColor blackColor];
_footerView.sectionCount = [testArray1 count];

// THIS IS THE VIEW WHEN THE USER INTERACTS WITH THE CHART
/*
_informationView = [[JBChartInformationView alloc] initWithFrame:CGRectMake(0, 0, 40, 300)];
[_informationView setBackgroundColor:[UIColor grayColor]];*/


[_chartView setMinimumValue:1.0f];
[_chartView setMaximumValue:20.0f];

[self.view addSubview:_footerView];
[self.view addSubview:_headerView];
[self.view addSubview:_chartView];
//    [self.view addSubview:_informationView];
[_chartView reloadData];

[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}

- (BOOL)lineChartView:(JBLineChartView *)lineChartView showsDotsForLineAtLineIndex:(NSUInteger)lineIndex;
{
return YES;
}

- (NSUInteger)numberOfLinesInLineChartView:(JBLineChartView *)lineChartView;
{
return 1;
}

- (NSUInteger)lineChartView:(JBLineChartView *)lineChartView numberOfVerticalValuesAtLineIndex:(NSUInteger)lineIndex;
{
return 1;
}


- (CGFloat)lineChartView:(JBLineChartView *)lineChartView verticalValueForHorizontalIndex:(NSUInteger)horizontalIndex atLineIndex:(NSUInteger)lineIndex;
{
return [[[testArray2 objectAtIndex:lineIndex] objectAtIndex:horizontalIndex] floatValue];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

Answer 1

一些问题：

不要将数值作为字符串存储在测试数组中。
删除mutableLineCharts代码;这是演示中的剩余部分，不需要用于您的目的。
我假设你想要两条线？一个虚线和一个固体？如果是这样，请为numberOfLinesInLineChartView返回JBLineChartLineCount而不是1。
在verticalValueForHorizontalIndex中返回testArray1或testArray2的数值。

初始化数据

- (void) initData
{
    testArray1 = @[@(1), @(2), @(3), @(4), @(5), @(6), @(7), @(8), @(9), @(10)];
    testArray2 = @[@(11), @(12), @(13), @(14), @(15), @(16), @(17), @(18), @(19), @(20)];
}

行数

- (NSUInteger)numberOfLinesInLineChartView:(JBLineChartView *)lineChartView;
{
    return JBLineChartLineCount;
}

数据计数

- (NSUInteger)lineChartView:(JBLineChartView *)lineChartView numberOfVerticalValuesAtLineIndex:(NSUInteger)lineIndex;
{
    if (lineIndex == JBLineChartLineSolid)
    {
        return [self.testArray1 count];
    }
    else
    {
        return [self.testArray2 count];
    }
    return 0;
}

数据值

- (CGFloat)lineChartView:(JBLineChartView *)lineChartView verticalValueForHorizontalIndex:(NSUInteger)horizontalIndex atLineIndex:(NSUInteger)lineIndex;
{
    if (lineIndex == JBLineChartLineSolid)
    {
        NSNumber *value = (NSNumber *)[self.testArray1 objectAtIndex:horizontalIndex];
        return [value floatValue];
    }
    else
    {
        NSNumber *value = (NSNumber *)[self.testArray2 objectAtIndex:horizontalIndex];
        return [value floatValue];
    }
    return 0;
}

希望这会有所帮助。

无法实现JBChartView

1 个答案: