PNChart
一、项目需要实现图表（折线图）的功能，由于IOS并没有原生的控件可以开发图表，经在网络上搜索决定使用PNChart第三方库实现折线图的功能，PNChart还可以创建柱状图、饼图、圆形进度条等图表视图，我就不再一一的举例实现相关的视图。
（1）创建一个折线图；
//折线图
self.lineChart = [[PNLineChart alloc] initWithFrame:CGRectMake(0, 30, [UIScreen mainScreen].bounds.size.width, 200)];
self.lineChart.legendStyle = PNLegendItemStyleStacked;
self.lineChart.delegate = self;
self.lineChart.showCoordinateAxis = YES; //显示坐标系
self.lineChart.showGenYLabels = YES;
self.lineChart.showLabel = YES;
self.lineChart.thousandsSeparator = YES;
[self.lineChart setXLabels:@[@"1月",@"2月",@"3月",@"4月",@"5月",@"6月",@"7月",@"8月",@"9月",@"10月",@"11月",@"12月"]];
NSArray *data01Array = @[@60.1, @160.1, @126.4, @262.2, @186.2, @60.1, @160.1, @126.4, @262.2, @186.2, @60.1, @160.1];
PNLineChartData *data01 = [PNLineChartData new]; //chart数据
data01.dataTitle = @"Alpha";
data01.color = PNFreshGreen; //折线的颜色
data01.itemCount = self.lineChart.xLabels.count; //x轴坐标item数
data01.inflexionPointStyle = PNLineChartPointStyleCircle; //数值点的样式
data01.getData = ^(NSUInteger index) {
CGFloat yValue = [data01Array[index] floatValue];
return [PNLineChartDataItem dataItemWithY:yValue];
};
self.lineChart.chartData = @[data01];
[self.lineChart strokeChart]; //画折线，带动画
//PNChartDelegate委托的实现
- (void)userClickedOnLinePoint:(CGPoint)point lineIndex:(NSInteger)lineIndex {
NSLog(@"Click on line %f, %f, line index is %d",point.x, point.y, (int)lineIndex);
}
- (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);
//在这个位置弹出逻辑
}
（2）更新折线图的数据；
你可以创建一个更新的按钮或者是一些选项卡来更新lineChart的内容；
//更新折线的数据
- (void)updateView {
NSArray *data01Array = @[@80.1, @180.1, @126.4, @292.2, @186.2, @80.1, @160.1, @126.4, @262.2, @186.2, @80.1, @160.1];
PNLineChartData *data01 = [PNLineChartData new];
data01.dataTitle = @"Alpha";
data01.color = PNFreshGreen;
data01.itemCount = self.lineChart.xLabels.count;
data01.inflexionPointStyle = PNLineChartPointStyleCircle;
data01.getData = ^(NSUInteger index) {
CGFloat yValue = [data01Array[index] floatValue];
return [PNLineChartDataItem dataItemWithY:yValue];
};
[self.lineChart updateChartData:@[data01]];
[self.lineChart strokeChart];
}
折线图效果：
