iOS 折线图实现，虚线，渐变色填充，线条动画

效果图 Demo地址

Demo主要实现了一下几点功能

1.折线图 + stroke动画 + 可左右滚动

2.虚线标注

3.渐变蒙层填充

4.小圆点展示 + 点击放大动画

如果以上效果有满足您当前需要请往下看

拆分界面

调用示例

- (NXLineChartView * )chartView{if (!_chartView) {_chartView = [[NXLineChartView alloc]init];_chartView.backgroundColor = [UIColor whiteColor];_chartView.center = CGPointMake([UIScreen mainScreen].bounds.size.width/2, [UIScreen mainScreen].bounds.size.height/2);_chartView.bounds = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width-100, 200);_chartView.lineChartXLabelArray = @[@"魅族",@"华为",@"中兴",@"小米",@"苹果",@"一加",@"乐视",@"音乐",@"电视",@"体育"];_chartView.lineChartYLabelArray = @[];_chartView.LineChartDataArray   = @[@100,@40,@60,@45,@100,@55,@33,@120,@40,@100];}return _chartView;
}

#import <UIKit/UIKit.h>@interface NXLineChartView : UIView
@property (nonatomic, strong) NSArray * lineChartYLabelArray;
@property (nonatomic, strong) NSArray * lineChartXLabelArray; // X轴数据
@property (nonatomic, strong) NSArray * LineChartDataArray; // 数据源
@end

1.画折线，这里通过UIBezierPath和CAShapeLayer结合绘图

先创建可左右滚动的scrollView

//可滚动视图
- (UIScrollView *)mainScroll{if (!_mainScroll) {_mainScroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];_mainScroll.showsVerticalScrollIndicator = NO;_mainScroll.showsHorizontalScrollIndicator = NO;[self addSubview:_mainScroll];}return _mainScroll;
}

通过LineChartDataArray获得的数据，进行绘制

// 设置折线图
- (void)setLineChartDataArray:(NSArray *)LineChartDataArray{_LineChartDataArray = LineChartDataArray;if (!_LineChartDataArray) return;// [self drawGragient];UIBezierPath * bezierPath = [self getPath];CAShapeLayer * layers = [CAShapeLayer layer];layers.path = bezierPath.CGPath;layers.lineWidth = 2.0;layers.strokeColor = [UIColor redColor].CGColor;layers.fillColor = [UIColor clearColor].CGColor;[self doAnimationWithLayer:layers];[self.mainScroll.layer addSublayer:layers];// self.gredientView.layer.mask = layers;[self addTopPointButton]; // 小圆点[self drawGredientLayer]; // 渐变}- (UIBezierPath *)getPath{self.topPointArray = [[NSMutableArray alloc]init];UIBezierPath * bezierPath = [UIBezierPath bezierPath];for (int idx =0; idx<_LineChartDataArray.count; idx++) {if (idx == 0) {CGPoint startPoint = CGPointMake([_pointXArray[0] floatValue], self.frame.size.height-[_LineChartDataArray[0] floatValue]-bottomMarginScale);[bezierPath moveToPoint:startPoint];[self.topPointArray addObject:[NSValue valueWithCGPoint:startPoint]];}else{CGPoint point = CGPointMake([_pointXArray[idx] floatValue], self.frame.size.height-[_LineChartDataArray[idx] floatValue]-bottomMarginScale);[bezierPath addLineToPoint:point];[self.topPointArray addObject:[NSValue valueWithCGPoint:point]];}}return bezierPath;}

线条动画采用核心动画strokeEnd这个效果实现，代码如下

- (void)doAnimationWithLayer:(CAShapeLayer *)layer{CABasicAnimation * baseAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];baseAnimation.duration = 2;baseAnimation.fromValue = @0.0;baseAnimation.toValue = @1.0;baseAnimation.repeatCount = 1;[layer addAnimation:baseAnimation forKey:@"strokeAnimation"];}

2.虚线标注

- (void)drawRect:(CGRect)rect {CGContextRef ctx = UIGraphicsGetCurrentContext();CGFloat yAxisOffset =  10.f;CGPoint point;CGFloat yStepHeight = rect.size.height / self.LineChartDataArray.count;CGContextSetStrokeColorWithColor(ctx, [UIColor lightGrayColor].CGColor);CGContextSetFillColorWithColor(ctx, [UIColor redColor].CGColor);for (NSUInteger i = 0; i < _LineChartDataArray.count; i++) {point = CGPointMake(10 + yAxisOffset, (rect.size.height - i * yStepHeight + 10 / 2));CGContextMoveToPoint(ctx, point.x, point.y);// add dotted style gridCGFloat dash[] = {6, 5};// dot diameter is 20 pointsCGContextSetLineWidth(ctx, 0.5);CGContextSetFillColorWithColor(ctx, [UIColor redColor].CGColor);CGContextSetLineCap(ctx, kCGLineCapRound);CGContextSetLineDash(ctx, 0.0, dash, 2);// 这里是改变虚线的宽度CGRect frame = CGRectMake(rect.origin.x, rect.origin.y, self.totalWidth, rect.size.height);CGContextAddLineToPoint(ctx, CGRectGetWidth(frame) - 5 + 5, point.y);CGContextStrokePath(ctx);}}

3.渐变蒙层填充

/*@parameter 背景颜色填充*/- (void)drawGredientLayer{CAGradientLayer *gradientLayer = [CAGradientLayer layer];gradientLayer.frame = CGRectMake(0, 0, self.totalWidth, self.frame.size.height-bottomMarginScale);gradientLayer.colors = @[(__bridge id)[UIColor colorWithRed:250/255.0 green:170/255.0 blue:10/255.0 alpha:0.8].CGColor,(__bridge id)[UIColor colorWithWhite:1 alpha:0.4].CGColor];gradientLayer.locations=@[@0.0,@1.0];gradientLayer.startPoint = CGPointMake(0.0,0.0);gradientLayer.endPoint = CGPointMake(1,0);UIBezierPath *gradientPath = [UIBezierPath bezierPath];[gradientPath moveToPoint:CGPointMake([_pointXArray[0] floatValue], self.frame.size.height-bottomMarginScale)];for (int i=0; i<_LineChartDataArray.count; i++) {[gradientPath addLineToPoint:CGPointMake([_pointXArray[i] floatValue], self.frame.size.height-[_LineChartDataArray[i] floatValue]-bottomMarginScale)];}[gradientPath addLineToPoint:CGPointMake([_pointXArray[_pointXArray.count-1] floatValue], self.frame.size.height-bottomMarginScale)];CAShapeLayer *arc = [CAShapeLayer layer];arc.path = gradientPath.CGPath;gradientLayer.mask = arc;[self.mainScroll.layer addSublayer:gradientLayer];}

4.小圆点展示 + 点击放大动画

小圆点

// 添加小圆点
- (void)addTopPointButton{if (self.topPointArray.count ==0) return;for (int idx =0; idx<self.topPointArray.count; idx++) {CGPoint point = [self.topPointArray[idx] CGPointValue];UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];button.center = point;button.bounds = CGRectMake(0, 0, 10, 10);button.layer.cornerRadius = 5;button.clipsToBounds = YES;button.backgroundColor = [UIColor cyanColor];button.tag = GAP+idx;[button setTitle:[self.LineChartDataArray[idx] stringValue] forState:UIControlStateNormal];[button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];button.titleLabel.font = [UIFont systemFontOfSize:5];button.titleEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);[button addTarget:self action:@selector(didSelectButtonClick:) forControlEvents:UIControlEventTouchUpInside];[self.mainScroll addSubview:button];}}

小圆点点击放大动画采用核心动画scale

- (void)didSelectButtonClick:(UIButton *)sender{for (id emptyObj in self.mainScroll.subviews) {if ([emptyObj isKindOfClass:[UIButton class]]) {UIButton * btn = (UIButton *)emptyObj;//  btn.bounds = CGRectMake(0, 0, 5, 5);//  [btn setTitleColor:[UIColor clearColor] forState:UIControlStateNormal];[btn.layer removeAllAnimations];}}[self doScaleAnimationWithView:sender];NSLog(@"%@",[self.LineChartDataArray[sender.tag-GAP] stringValue]);[sender setTitle:[self.LineChartDataArray[sender.tag-GAP] stringValue] forState:UIControlStateNormal];[sender setTitleColor:[UIColor redColor] forState:UIControlStateNormal];sender.titleLabel.font = [UIFont systemFontOfSize:5];}- (void)doScaleAnimationWithView:(UIView *)view{CAKeyframeAnimation * animation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];animation.duration = 0.3;animation.values = @[@2,@1.5,@0.8,@1,@2];animation.repeatCount = 2;animation.fillMode = kCAFillModeForwards;animation.removedOnCompletion = NO;[view.layer addAnimation:animation forKey:@"scaleAnimations"];
}

底部X坐标轴数据填充

// 底部X视图
- (void)setLineChartXLabelArray:(NSArray *)lineChartXLabelArray{_lineChartXLabelArray = lineChartXLabelArray;if (!_lineChartXLabelArray) return;_pointXArray = [[NSMutableArray alloc]init];// CGFloat labelWidthScale = (self.frame.size.width-leftXMarginScale-rightXMarginScale)/_lineChartXLabelArray.count;self.totalWidth =0;for (int idx = 0; idx < _lineChartXLabelArray.count; idx ++) {CGFloat labelWidthScale = [self getLabelWidthWithText:_lineChartXLabelArray[idx]];CGFloat x = self.totalWidth+marginScale;CGFloat y = self.frame.size.height- lineChartXlabelHeight;UILabel * label = [[UILabel alloc]init];label.frame = CGRectMake(x, y, labelWidthScale, lineChartXlabelHeight);label.text = _lineChartXLabelArray[idx];label.textAlignment = NSTextAlignmentCenter;label.textColor = [UIColor redColor];label.font = [UIFont systemFontOfSize:fontSize];[_pointXArray addObject:[NSString stringWithFormat:@"%.f",label.center.x]];[self.mainScroll addSubview:label];self.totalWidth = label.frame.origin.x+label.frame.size.width;[self.mainScroll setContentSize:CGSizeMake(CGRectGetMaxX(label.frame), 0)];}}

再看下调用示例比较简单

- (NXLineChartView * )chartView{if (!_chartView) {_chartView = [[NXLineChartView alloc]init];_chartView.backgroundColor = [UIColor whiteColor];_chartView.center = CGPointMake([UIScreen mainScreen].bounds.size.width/2, [UIScreen mainScreen].bounds.size.height/2);_chartView.bounds = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width-100, 200);_chartView.lineChartXLabelArray = @[@"魅族",@"华为",@"中兴",@"小米",@"苹果",@"一加",@"乐视",@"音乐",@"电视",@"体育"];_chartView.lineChartYLabelArray = @[];_chartView.LineChartDataArray   = @[@100,@40,@60,@45,@100,@55,@33,@120,@40,@100];}return _chartView;
}

Demo地址

iOS 折线图实现，虚线，渐变色填充，线条动画相关推荐

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iOS 折线图实现，虚线，渐变色填充，线条动画

效果图 Demo地址

Demo主要实现了一下几点功能

1.折线图 + stroke动画 + 可左右滚动

2.虚线标注

3.渐变蒙层填充

4.小圆点展示 + 点击放大动画

如果以上效果有满足您当前需要请往下看

拆分界面

调用示例

1.画折线，这里通过UIBezierPath和CAShapeLayer结合绘图

先创建可左右滚动的scrollView

通过LineChartDataArray获得的数据，进行绘制

线条动画采用核心动画strokeEnd这个效果实现，代码如下

2.虚线标注

3.渐变蒙层填充

4.小圆点展示 + 点击放大动画

小圆点

小圆点点击放大动画采用核心动画scale

底部X坐标轴数据填充

再看下调用示例比较简单

iOS 折线图实现，虚线，渐变色填充，线条动画相关推荐

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