iOS开发（OC）——折线图的绘制（带动画）

新建一个DrawLine类继承UIView
DrawLine.h代码

@property (nonatomic,strong)NSMutableArray *data;@property (nonatomic, strong) CAShapeLayer *lineChartLayer;
@property (nonatomic, strong)UIBezierPath * path1;
/** 渐变背景视图 */
@property (nonatomic, strong) UIView *gradientBackgroundView;
/** 渐变图层 */
@property (nonatomic, strong) CAGradientLayer *gradientLayer;
/** 颜色数组 */
@property (nonatomic, strong) NSMutableArray *gradientLayerColors;@property (nonatomic,assign)int ySpace;//y轴间隔
@property (nonatomic,assign)int yNum;//y轴的分点数
@property (nonatomic,assign)int xSpace;//x轴间隔
@property (nonatomic,assign)int xNum;//x轴的分点数
@property (nonatomic,strong)NSString *ytitle;//y轴标题
@property (nonatomic,strong)NSString *xtitle;//x轴标题
@property (nonatomic,assign)BOOL showNum;//显示数值//建立坐标
-(void)initCoordinate;
//开始画图
-(void)beginDraw;

3.DrawLine.m代码

- (instancetype)initWithFrame:(CGRect)frame{if (self = [super initWithFrame:frame]) {self.backgroundColor = [UIColor whiteColor];[self drawGradientBackgroundView];}return self;
}-(void)initCoordinate
{//y轴
//    UIView *view=[[UIView alloc] initWithFrame:CGRectMake(50, 15, 1, self.frame.size.height-60)];
//    view.backgroundColor=[UIColor lightGrayColor];
//    [self addSubview:view];UILabel *label=[[UILabel alloc] initWithFrame:CGRectMake(70, 10, 150, 21)];label.text=self.ytitle;label.font=[UIFont systemFontOfSize:12];label.textColor=[UIColor grayColor];[self addSubview:label];for(int i=self.yNum;i>0;i--){UIView *cutoffLine=[[UIView alloc] initWithFrame:CGRectMake(51, 15+(self.frame.size.height-60)/(self.yNum+1)*(self.yNum+1-i), self.frame.size.width-100, 1)];cutoffLine.backgroundColor=[UIColor colorWithRed:245/255.0 green:245/255.0 blue:245/255.0 alpha:1.0];[self.gradientBackgroundView addSubview:cutoffLine];UILabel *label=[[UILabel alloc] initWithFrame:CGRectMake(0, cutoffLine.center.y-10.5, 45, 21)];label.font=[UIFont systemFontOfSize:10];label.textColor=[UIColor grayColor];label.textAlignment=NSTextAlignmentRight;label.text=[NSString stringWithFormat:@"%d",self.ySpace*i];[self addSubview:label];}//x轴UIView *view=[[UIView alloc] initWithFrame:CGRectMake(50, 15+self.frame.size.height-60, screen_width-100, 1)];view.backgroundColor=[UIColor lightGrayColor];[self addSubview:view];for(int i=0;i<self.xNum;i++){UILabel *label=[[UILabel alloc] initWithFrame:CGRectMake((screen_width-100)/self.xNum*i+50, self.frame.size.height-40, (screen_width-100)/self.xNum, 21)];label.font=[UIFont systemFontOfSize:10];label.textColor=[UIColor grayColor];label.text=[NSString stringWithFormat:@"%d",self.xSpace*i];[self addSubview:label];}label=[[UILabel alloc] initWithFrame:CGRectMake(screen_width-70, 20+self.frame.size.height-60, 70, 21)];label.text=self.xtitle;label.font=[UIFont systemFontOfSize:12];label.textColor=[UIColor grayColor];[self addSubview:label];
}#pragma mark 画折线图
- (void)dravLine{CGFloat barWidth=(screen_width-100)/self.xNum*(self.xNum-1)/((self.xNum-1)*self.xSpace);//条形图1个单位的宽CGFloat barHeight=(self.frame.size.height-60)/(self.yNum+1)/self.ySpace;//条形图1个单位的高//（xorignal,yorignal）坐标原点CGFloat xorignal=50;CGFloat yorignal=15+self.frame.size.height-60;//    UILabel * label = (UILabel*)[self viewWithTag:1000];UIBezierPath * path = [[UIBezierPath alloc]init];path.lineWidth = 1.0;self.path1 = path;UIColor * color = [UIColor greenColor];[color set];//起点[path moveToPoint:CGPointMake( [self.data[0][@"x"] floatValue]*barWidth+xorignal, yorignal-[self.data[0][@"y"] floatValue]*barHeight )];//数值UILabel *label=(UILabel *)[self viewWithTag:1000];if(label==nil){label=[[UILabel alloc] initWithFrame:CGRectMake([self.data[0][@"x"] floatValue]*barWidth+xorignal-50, yorignal-[self.data[0][@"y"] floatValue]*barHeight-20, 100, 21)];label.font=[UIFont systemFontOfSize:10];label.textColor=[UIColor grayColor];label.tag=1000;label.textAlignment=NSTextAlignmentCenter;label.text=[NSString stringWithFormat:@"%.0f",[self.data[0][@"y"] floatValue]];[self addSubview:label];}else{label.frame=CGRectMake([self.data[0][@"x"] floatValue]*barWidth+xorignal-50, yorignal-[self.data[0][@"y"] floatValue]*barHeight-20, 100, 21);label.text=[NSString stringWithFormat:@"%.0f",[self.data[0][@"y"] floatValue]];}if(!self.showNum){label.hidden=YES;}else{label.hidden=NO;}//圆点UIView *roundView=(UIView *)[self viewWithTag:100];if(roundView==nil){roundView=[[UIView alloc] initWithFrame:CGRectMake([self.data[0][@"x"] floatValue]*barWidth+xorignal-3, yorignal-[self.data[0][@"y"] floatValue]*barHeight-3, 6, 6)];roundView.layer.masksToBounds=YES;roundView.layer.cornerRadius=3;roundView.backgroundColor=[UIColor grayColor];roundView.tag=100;[self addSubview:roundView];}else{roundView=[[UIView alloc] initWithFrame:CGRectMake([self.data[0][@"x"] floatValue]*barWidth+xorignal-3, yorignal-[self.data[0][@"y"] floatValue]*barHeight-3, 6, 6)];}//转折点for (NSInteger i = 1; i< self.data.count; i++) {[path addLineToPoint:CGPointMake([self.data[i][@"x"] floatValue]*barWidth+xorignal, yorignal-[self.data[i][@"y"] floatValue]*barHeight)];UILabel *label=(UILabel *)[self viewWithTag:1000+i];if(label==nil){label=[[UILabel alloc] initWithFrame:CGRectMake([self.data[i][@"x"] floatValue]*barWidth+xorignal-50, yorignal-[self.data[i][@"y"] floatValue]*barHeight-20, 100, 21)];label.font=[UIFont systemFontOfSize:10];label.textColor=[UIColor grayColor];label.tag=1000+i;label.textAlignment=NSTextAlignmentCenter;label.text=[NSString stringWithFormat:@"%.0f",[self.data[i][@"y"] floatValue]];[self addSubview:label];}else{label.frame=CGRectMake([self.data[i][@"x"] floatValue]*barWidth+xorignal-50, yorignal-[self.data[i][@"y"] floatValue]*barHeight-20, 100, 21);label.text=[NSString stringWithFormat:@"%.0f",[self.data[i][@"y"] floatValue]];}if(!self.showNum){//不显示转折点数值label.hidden=YES;}else{label.hidden=NO;}UIView *roundView=(UIView *)[self viewWithTag:100+i];if(roundView==nil){roundView=[[UIView alloc] initWithFrame:CGRectMake([self.data[i][@"x"] floatValue]*barWidth+xorignal-3, yorignal-[self.data[i][@"y"] floatValue]*barHeight-3, 6, 6)];roundView.layer.masksToBounds=YES;roundView.layer.cornerRadius=3;roundView.backgroundColor=[UIColor grayColor];roundView.tag=100+i;[self addSubview:roundView];}else{roundView=[[UIView alloc] initWithFrame:CGRectMake([self.data[i][@"x"] floatValue]*barWidth+xorignal-3, yorignal-[self.data[i][@"y"] floatValue]*barHeight-3, 6, 6)];}}self.lineChartLayer = [CAShapeLayer layer];self.lineChartLayer.path = path.CGPath;//线的颜色self.lineChartLayer.strokeColor = [UIColor greenColor].CGColor;self.lineChartLayer.fillColor = [[UIColor clearColor] CGColor];self.lineChartLayer.lineCap = kCALineCapRound;self.lineChartLayer.lineJoin = kCALineJoinRound;[self.gradientBackgroundView.layer addSublayer:self.lineChartLayer];//直接添加导视图上
}#pragma mark 渐变的颜色
- (void)drawGradientBackgroundView {// 渐变背景视图（不包含坐标轴）self.gradientBackgroundView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height)];[self addSubview:self.gradientBackgroundView];/** 创建并设置渐变背景图层 *///初始化CAGradientlayer对象，使它的大小为渐变背景视图的大小self.gradientLayer = [CAGradientLayer layer];self.gradientLayer.frame = self.gradientBackgroundView.bounds;//设置渐变区域的起始和终止位置（范围为0-1），即渐变路径self.gradientLayer.startPoint = CGPointMake(0, 0.0);self.gradientLayer.endPoint = CGPointMake(1.0, 0.0);//设置颜色的渐变过程self.gradientLayerColors = [NSMutableArray arrayWithArray:@[(__bridge id)[UIColor whiteColor].CGColor, (__bridge id)[UIColor whiteColor].CGColor]];self.gradientLayer.colors = self.gradientLayerColors;//将CAGradientlayer对象添加在我们要设置背景色的视图的layer层[self.gradientBackgroundView.layer addSublayer:self.gradientLayer];}//开始画（动画）
-(void)beginDraw
{if(self.lineChartLayer!=nil){[self.lineChartLayer removeFromSuperlayer];}[self dravLine];self.lineChartLayer.lineWidth = 2;CABasicAnimation *pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];pathAnimation.duration = 1.0;pathAnimation.repeatCount = 1;pathAnimation.removedOnCompletion = YES;pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f];pathAnimation.toValue = [NSNumber numberWithFloat:1.0f];// 设置动画代理，动画结束时添加一个标签，显示折线终点的信息pathAnimation.delegate = self;[self.lineChartLayer addAnimation:pathAnimation forKey:@"strokeEnd"];
}

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