一、简介

项目地址：https://github.com/kevinzhow/PNChart
PNChat实现效果不错的曲线图和柱状图等各种图表。

二、添加PNChat到项目里

通过Cocoapods

pod 'PNChart'

手动安装
直接拖进项目里就可以了。

三、用法

1.折线图

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#import "PNChart.h"

//For Line Chart
PNLineChart * lineChart = [[PNLineChart alloc] initWithFrame:CGRectMake(0, 135.0, SCREEN_WIDTH, 200.0)];
[lineChart setXLabels:@[@"SEP 1",@"SEP 2",@"SEP 3",@"SEP 4",@"SEP 5"]];

// Line Chart No.1
NSArray * data01Array = @[@60.1, @160.1, @126.4, @262.2, @186.2];
PNLineChartData *data01 = [PNLineChartData new];
data01.color = PNFreshGreen;
data01.itemCount = lineChart.xLabels.count;
data01.getData = ^(NSUInteger index) {
    CGFloat yValue = [data01Array[index] floatValue];
    return [PNLineChartDataItem dataItemWithY:yValue];
};
// Line Chart No.2
NSArray * data02Array = @[@20.1, @180.1, @26.4, @202.2, @126.2];
PNLineChartData *data02 = [PNLineChartData new];
data02.color = PNTwitterColor;
data02.itemCount = lineChart.xLabels.count;
data02.getData = ^(NSUInteger index) {
    CGFloat yValue = [data02Array[index] floatValue];
    return [PNLineChartDataItem dataItemWithY:yValue];
};

lineChart.chartData = @[data01, data02];
[lineChart strokeChart];

可以通过下面的代码做平滑的线

lineChart.showSmoothLines = YES;

2.柱状图

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#import "PNChart.h"

//For BarC hart
PNBarChart * barChart = [[PNBarChart alloc] initWithFrame:CGRectMake(0, 135.0, SCREEN_WIDTH, 200.0)];
[barChart setXLabels:@[@"SEP 1",@"SEP 2",@"SEP 3",@"SEP 4",@"SEP 5"]];
[barChart setYValues:@[@1,  @10, @2, @6, @3]];
[barChart strokeChart];

3.圆圈

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#import "PNChart.h"

//For Circle Chart

PNCircleChart * circleChart = [[PNCircleChart alloc] initWithFrame:CGRectMake(0, 80.0, SCREEN_WIDTH, 100.0) total:[NSNumber numberWithInt:100] current:[NSNumber numberWithInt:60] clockwise:NO shadow:NO];
circleChart.backgroundColor = [UIColor clearColor];
[circleChart setStrokeColor:PNGreen];
[circleChart strokeChart];

4.饼图

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# import "PNChart.h"
//For Pie Chart
NSArray *items = @[[PNPieChartDataItem dataItemWithValue:10 color:PNRed],
                           [PNPieChartDataItem dataItemWithValue:20 color:PNBlue description:@"WWDC"],
                           [PNPieChartDataItem dataItemWithValue:40 color:PNGreen description:@"GOOL I/O"],
                           ];



PNPieChart *pieChart = [[PNPieChart alloc] initWithFrame:CGRectMake(40.0, 155.0, 240.0, 240.0) items:items];
pieChart.descriptionTextColor = [UIColor whiteColor];
pieChart.descriptionTextFont  = [UIFont fontWithName:@"Avenir-Medium" size:14.0];
[pieChart strokeChart];

5.点状图

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# import "PNChart.h"
//For Scatter Chart

PNScatterChart *scatterChart = [[PNScatterChart alloc] initWithFrame:CGRectMake(SCREEN_WIDTH /6.0 - 30, 135, 280, 200)];
[scatterChart setAxisXWithMinimumValue:20 andMaxValue:100 toTicks:6];
[scatterChart setAxisYWithMinimumValue:30 andMaxValue:50 toTicks:5];

NSArray * data01Array = [self randomSetOfObjects];
PNScatterChartData *data01 = [PNScatterChartData new];
data01.strokeColor = PNGreen;
data01.fillColor = PNFreshGreen;
data01.size = 2;
data01.itemCount = [[data01Array objectAtIndex:0] count];
data01.inflexionPointStyle = PNScatterChartPointStyleCircle;
__block NSMutableArray *XAr1 = [NSMutableArray arrayWithArray:[data01Array objectAtIndex:0]];
__block NSMutableArray *YAr1 = [NSMutableArray arrayWithArray:[data01Array objectAtIndex:1]];
data01.getData = ^(NSUInteger index) {
    CGFloat xValue = [[XAr1 objectAtIndex:index] floatValue];
    CGFloat yValue = [[YAr1 objectAtIndex:index] floatValue];
    return [PNScatterChartDataItem dataItemWithX:xValue AndWithY:yValue];
};

[scatterChart setup];
self.scatterChart.chartData = @[data01];
/***
this is for drawing line to compare
CGPoint start = CGPointMake(20, 35);
CGPoint end = CGPointMake(80, 45);
[scatterChart drawLineFromPoint:start ToPoint:end WithLineWith:2 AndWithColor:PNBlack];
***/
scatterChart.delegate = self;

6.转折点突出的并有说明折线图，和有说明的饼图。

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#import "PNChart.h"

//For Line Chart

//Add Line Titles for the Legend
data01.dataTitle = @"Alpha";
data02.dataTitle = @"Beta Beta Beta Beta";

//Build the legend
self.lineChart.legendStyle = PNLegendItemStyleSerial;
UIView *legend = [self.lineChart getLegendWithMaxWidth:320];

//Move legend to the desired position and add to view
[legend setFrame:CGRectMake(100, 400, legend.frame.size.width, legend.frame.size.height)];
[self.view addSubview:legend];

//For Pie Chart

//Build the legend
self.pieChart.legendStyle = PNLegendItemStyleStacked;
UIView *legend = [self.pieChart getLegendWithMaxWidth:200];

//Move legend to the desired position and add to view
[legend setFrame:CGRectMake(130, 350, legend.frame.size.width, legend.frame.size.height)];
[self.view addSubview:legend];

7.增加带网格的效果

lineChart.showYGridLines = YES;
lineChart.yGridLinesColor = [UIColor grayColor];

8.更新数据

if ([self.title isEqualToString:@"Line Chart"]) {

    // Line Chart #1
    NSArray * data01Array = @[@(arc4random() % 300), @(arc4random() % 300), @(arc4random() % 300), @(arc4random() % 300), @(arc4random() % 300), @(arc4random() % 300), @(arc4random() % 300)];
    PNLineChartData *data01 = [PNLineChartData new];
    data01.color = PNFreshGreen;
    data01.itemCount = data01Array.count;
    data01.inflexionPointStyle = PNLineChartPointStyleTriangle;
    data01.getData = ^(NSUInteger index) {
        CGFloat yValue = [data01Array[index] floatValue];
        return [PNLineChartDataItem dataItemWithY:yValue];
    };

    // Line Chart #2
    NSArray * data02Array = @[@(arc4random() % 300), @(arc4random() % 300), @(arc4random() % 300), @(arc4random() % 300), @(arc4random() % 300), @(arc4random() % 300), @(arc4random() % 300)];
    PNLineChartData *data02 = [PNLineChartData new];
    data02.color = PNTwitterColor;
    data02.itemCount = data02Array.count;
    data02.inflexionPointStyle = PNLineChartPointStyleSquare;
    data02.getData = ^(NSUInteger index) {
        CGFloat yValue = [data02Array[index] floatValue];
        return [PNLineChartDataItem dataItemWithY:yValue];
    };

    [self.lineChart setXLabels:@[@"DEC 1",@"DEC 2",@"DEC 3",@"DEC 4",@"DEC 5",@"DEC 6",@"DEC 7"]];
    [self.lineChart updateChartData:@[data01, data02]];

}
else if ([self.title isEqualToString:@"Bar Chart"])
{
    [self.barChart setXLabels:@[@"Jan 1",@"Jan 2",@"Jan 3",@"Jan 4",@"Jan 5",@"Jan 6",@"Jan 7"]];
    [self.barChart updateChartData:@[@(arc4random() % 30),@(arc4random() % 30),@(arc4random() % 30),@(arc4random() % 30),@(arc4random() % 30),@(arc4random() % 30),@(arc4random() % 30)]];
}
else if ([self.title isEqualToString:@"Circle Chart"])
{
    [self.circleChart updateChartByCurrent:@(arc4random() % 100)];
}

9.回调方法

#import "PNChart.h"

//For LineChart

lineChart.delegate = self;

//For DelegateMethod


-(void)userClickedOnLineKeyPoint:(CGPoint)point lineIndex:(NSInteger)lineIndex pointIndex:(NSInteger)pointIndex{
    NSLog(@"Click Key on line %f, %f line index is %d and point index is %d",point.x, point.y,(int)lineIndex, (int)pointIndex);
}

-(void)userClickedOnLinePoint:(CGPoint)point lineIndex:(NSInteger)lineIndex{
    NSLog(@"Click on line %f, %f, line index is %d",point.x, point.y, (int)lineIndex);
}

10.动画
Animation is enabled by default when drawing all charts. It can be disabled by setting displayAnimation = NO.

#import "PNChart.h"

//For LineChart

lineChart.displayAnimation = NO;