YASimpleGraph

一个简单易用的折线图控件，最近项目工程中需要用到一个折现图，看了网上的一些例子，但都不能满足UED的特殊要求，所以只能自己写了一个。

先来看下效果图：

基本实现以下功能：

• 支持自定义Y轴坐标数
• 支持自定义X轴显示索引
• 添加参考线、点击标线
• 支持自定义弹出说明视图 ·····

Demo见github YASimpleGraph，喜欢的话请star下^_^ ###使用说明

YASimpleGraph 目前已经支持CocoaPods，可以在很短的时间内被添加到任何工程中。

####安装 YASimpleGraph 的安装，最简单的方法是使用CocoaPods，在PodFile里添加如下：

pod 'YASimpleGraph', '~> 0.0.1'

或者直接将YASimpleGraphView.h和YASimpleGraphView.m两个源文件直接拖进自己的项目工程中。

####集成

• 首先导入头文件

#import "YASimpleGraphView.h"

• 遵循相应协议

@interface ViewController () <YASimpleGraphDelegate> 

• 初始化

//初始化数据源
allValues = @[@"20.00",@"0",@"110.00",@"70",@"80",@"40"];
allDates = @[@"06/01",@"06/02",@"06/03",@"06/04",@"06/05",@"06/06"];

//初始化折线图并设置相应属性
YASimpleGraphView *graphView = [[YASimpleGraphView alloc]init];
graphView.frame = CGRectMake(15, 200, 375-30, 200);
graphView.backgroundColor = [UIColor whiteColor];
graphView.allValues = allValues;
graphView.allDates = allDates;
graphView.defaultShowIndex = allDates.count-1;
graphView.delegate = self;
graphView.lineColor = [UIColor grayColor];
graphView.lineWidth = 1.0/[UIScreen mainScreen].scale;
graphView.lineAlpha = 1.0;
graphView.enableTouchLine = YES;
[self.view addSubview:graphView];

• 开始绘制

[graphView startDraw];

• 实现相应协议

//自定义X轴 显示标签索引
- (NSArray *)incrementPositionsForXAxisOnLineGraph:(YASimpleGraphView *)graph {
    return @[@0,@1,@2,@3,@4,@5];
}

//Y轴坐标点数
- (NSInteger)numberOfYAxisLabelsOnLineGraph:(YASimpleGraphView *)graph {
    return 5;
}

//自定义popUpView
- (UIView *)popUpViewForLineGraph:(YASimpleGraphView *)graph {
    
    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 0, 0)];
    label.backgroundColor = [UIColor colorWithRed:146/255.0 green:191/255.0 blue:239/255.0 alpha:1];
    label.numberOfLines = 0;
    label.font = [UIFont systemFontOfSize:10];
    label.textAlignment = NSTextAlignmentCenter;
    return label;
}

//修改相应点位弹出视图
- (void)lineGraph:(YASimpleGraphView *)graph modifyPopupView:(UIView *)popupView forIndex:(NSUInteger)index {
    UILabel *label = (UILabel*)popupView;
    NSString *date = [NSString stringWithFormat:@"%@",allDates[index]];
    NSString *str = [NSString stringWithFormat:@" %@ \n %@元 ",date,allValues[index]];
    
    CGRect rect = [str boundingRectWithSize:CGSizeMake(MAXFLOAT, 40) options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:10]} context:nil];
    
    [label setFrame:CGRectMake(0, 0, rect.size.width, rect.size.height)];
    label.textColor = [UIColor whiteColor];
    label.text = str;
}

完成上述步骤，折线图控件已经集成到我们的项目中了，当然YASimpleGraph还提供了一系列的对外属性变量，使我们可以高度自定义折线图控件，如下：

/// The line color
@property (nonatomic, strong) UIColor *lineColor;

/// The line width
@property (nonatomic, assign) CGFloat lineWidth;

/// The line alpha
@property (assign, nonatomic) float lineAlpha;


/// The Dot color
@property (nonatomic, strong) UIColor *dotColor;

/// The Dot borderColor
@property (nonatomic, strong) UIColor *dotBorderColor;

/// The Dot width
@property (nonatomic, assign) CGFloat dotWidth;

/// The Dot borderWidth
@property (nonatomic, assign) CGFloat dotBorderWidth;


/// The dashLine color
@property (nonatomic, strong) UIColor *dashLineColor;

/// The dashLine width
@property (nonatomic, assign) CGFloat dashLineWidth;

/// The bottomLine color
@property (nonatomic, strong) UIColor *bottomLineColor;

/// The bottomLine width
@property (nonatomic, assign) CGFloat bottomLineHeight;

····

等等一系列，具体可参考YASimpleGraphView.h