内容简介:iOS-手把手教你画分时线
前言
最近项目和股票有关,自然而然想起了分时线,K线等东西.即使是出自自己手里的东西,放久了难觅看忘记,特别是当时的想法和逻辑思维过程.既然写了,总要留下点什么,于是有了这篇笔记.
先看看最后结果吧.此图确实不够美观,但是毕竟只是一个demo,一个骨架而已,具体的血肉需要大家自己根据需要去填充.
画分时线,我们需要做些什么?
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画框架(网格线);
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横坐标上的文字(时间轴);
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纵坐标上的文字(左边价格,右边涨跌率);
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画分时线;
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心跳效果;
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添加手势(长按和点击);
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画十字交叉线;
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画十字交叉线与横纵坐标交点处的文字;
下面一步步来实现上面的效果吧
0.工欲善其事必先利其器,先来抽几个方法吧
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心跳效果
/**心跳动画*/ - (void)heartAnimationWithLayer:(CALayer*)layer { CAAnimationGroup *group = [[CAAnimationGroup alloc]init]; group.duration = 0.5; group.repeatCount = HUGE; CABasicAnimation *scaleAnim = [CABasicAnimation animationWithKeyPath:@"transform.scale"]; scaleAnim.toValue = @1.2; CABasicAnimation *alphaAnim = [CABasicAnimation animationWithKeyPath:@"opacity"]; alphaAnim.toValue = @0.3f; group.animations = @[scaleAnim,alphaAnim]; [layer addAnimation:group forKey:nil]; }
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坐标轴的转换
/**根据时间获取坐标点*/ -(CGFloat)miniteTimeWithTimeStr:(NSString*)timeStr { if (timeStr == nil || [timeStr isEqualToString:@""]) return 0.0; NSArray *temp = [timeStr componentsSeparatedByString:@":"]; NSInteger minte = [temp[0] integerValue]*60 + [temp[1] integerValue]; //每分钟代表的宽度 CGFloat aveWidth = DPW/ 240.0; if (minte DPW *0.5) { totalTime = aveWidth * point.x + 11*60;//下午 } int h = totalTime / 60; int m = ((int)(totalTime + 0.5)) % 60; str = [NSString stringWithFormat:@"%d:%d",h,m]; return str; } /**根据价格获取坐标位置*/ - (CGFloat)priceLabelLocationWithPrice:(CGFloat)price { CGFloat height = DPH - 60; CGFloat avrSpace = height/(self.max - self.min); return height - ((price - self.min)*avrSpace); } /**根据坐标位置获取价格*/ - (NSString*)pricWithPoint:(CGPoint)point { NSString *price = @""; //单位距离代表的价格 CGFloat avePrice = (self.max - self.min)/(DPH - 60); //保留两位小数 price = [NSString stringWithFormat:@"%.2f",(self.max - point.y*avePrice)+0.005]; return price; }
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画文字
/**画文字,直接创建一个CATextLayer*/ - (void)drawLabelAtRect:(CGRect)rect textStr:(NSString*)textStr { CATextLayer *textLayer = [CATextLayer layer]; textLayer.frame = rect; [self.layer addSublayer:textLayer]; //set text attributes textLayer.foregroundColor = [UIColor blackColor].CGColor; textLayer.alignmentMode = kCAAlignmentJustified; textLayer.wrapped = YES; //choose a font UIFont *font = [UIFont systemFontOfSize:10]; //set layer font CFStringRef fontName = (__bridge CFStringRef)font.fontName; CGFontRef fontRef = CGFontCreateWithFontName(fontName); textLayer.font = fontRef; textLayer.fontSize = font.pointSize; CGFontRelease(fontRef); textLayer.contentsScale = [UIScreen mainScreen].scale; //choose some text //set layer text textLayer.string = textStr; } /**画文字,指定CATextLayer*/ - (void)drawCrossLabelWithTextLayer:(CATextLayer*)textLayer AtRect:(CGRect)rect textStr:(NSString*)textStr { textLayer.frame = rect; [self.layer addSublayer:textLayer]; //set text attributes textLayer.foregroundColor = [UIColor blackColor].CGColor; textLayer.alignmentMode = kCAAlignmentJustified; textLayer.wrapped = YES; //choose a font UIFont *font = [UIFont systemFontOfSize:10]; //set layer font CFStringRef fontName = (__bridge CFStringRef)font.fontName; CGFontRef fontRef = CGFontCreateWithFontName(fontName); textLayer.font = fontRef; textLayer.fontSize = font.pointSize; CGFontRelease(fontRef); textLayer.contentsScale = [UIScreen mainScreen].scale; //choose some text //set layer text textLayer.string = textStr; }
1.获取纵坐标的最大值,最小值和中间值
说明:
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横线:分时线最中间的横线对应昨日收盘价,这是固定的.但是,其他横线是根据数据实时变化的,旨在包含所有的数据点.所以,max = mid + 最大偏差;min = mid - 最大偏差;最大偏差=所有数据中偏离mid最大的价格与mid之间差值的绝对值.这样max - min 为价格的波动范围,有了这个就可以根据需要,画出横线(这里画了3条横线);
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竖线: 股票交易时间,上午9:30到11:30,下午13:00到15:00,总共4个小时;这里就可以算出单位距离代表的时间,从而确定每个时间节点在横坐标上的位置,画出横坐标.同理,也可算出每分钟代表的长度,这点在画十字交叉线与X轴的交点文字时用的到.对应的方法见上面已抽取的.
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分时线: 可以看到在这个方法中已近开始划线了.划线无非就是连线,moveToPoint 和addLineToPoint.为了避免再次遍历所有数据,所以在确定最大和最小价格的循环中就开始添加线;
/**数据处理*/ - (void)preworkForData { //0 拿到纵坐标的3个点(max,mid,min),mid=昨日收盘价 DPTimeLineItem *temp = self.dataArrM[0]; self.mid = [temp.pre_close_px doubleValue]; if ([temp.last_px doubleValue] -[temp.pre_close_px doubleValue] > 0) { self.max = [temp.last_px doubleValue]; self.min = [temp.pre_close_px doubleValue] -([temp.last_px doubleValue] -[temp.pre_close_px doubleValue] ); }else { self.min = [temp.last_px doubleValue]; self.max = [temp.pre_close_px doubleValue] + ([temp.pre_close_px doubleValue] -[temp.last_px doubleValue] ); } for (int i = 0; i< self.dataArrM.count; i ++ ) { DPTimeLineItem *item = self.dataArrM[i]; //获取纵坐标最大,最小,中间值 if (fabs(item.last_px.doubleValue - self.mid) >(self.max - self.mid)) { self.max = self.mid +fabs(item.last_px.doubleValue - self.mid); self.min = self.mid - fabs(item.last_px.doubleValue - self.mid); } //画分时线 CGFloat timeX = [self miniteTimeWithTimeStr:item.curr_time]; CGFloat priceY = [self priceLabelLocationWithPrice:item.last_px.floatValue]; if (i == 0) { if (self.isNeedBackGroundColor) { [self.timeLinePath moveToPoint:CGPointMake(0, DPH - 60)]; [self.timeLinePath addLineToPoint:CGPointMake(timeX, priceY)]; }else { [self.timeLinePath moveToPoint:CGPointMake(timeX, priceY)]; } } if (i == self.dataArrM.count-1) { self.currentPoint = CGPointMake(timeX, priceY); } [self.timeLinePath addLineToPoint:CGPointMake(timeX, priceY)]; } }
2.画网格线
说明:
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利用for循环,画横竖线;
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横纵坐标固定地方画文字
- (void)drawFramework { UIBezierPath *path = [[UIBezierPath alloc]init]; //三条横线 CGFloat rowSpace = (DPH -60.0)/2.0; NSString *tempStr = @""; for (int i = 0; i < 3; i ++) { [path moveToPoint:CGPointMake(0,rowSpace*i)]; [path addLineToPoint:CGPointMake(DPW, rowSpace*i)]; if (0 == i) { tempStr = [NSString stringWithFormat:@"%.2f",self.max]; }else if (1==i) { tempStr = [NSString stringWithFormat:@"%.2f",self.mid]; }else if (2 == i) { tempStr = [NSString stringWithFormat:@"%.2f",self.min]; } [self drawLabelAtRect:CGRectMake(-25, rowSpace*i-10, 25, 20) textStr:tempStr]; } //4条竖线 CGFloat colSpace = DPW / 4.0; for (int i = 0; i < 5; i ++) { [path moveToPoint:CGPointMake(colSpace*i,0)]; [path addLineToPoint:CGPointMake(colSpace*i, DPH-60)]; if (0 == i) { tempStr = @"9:30"; [self drawLabelAtRect:CGRectMake(colSpace*i, DPH-60 ,30,20) textStr:tempStr]; continue; }else if (1==i) { tempStr = @"10:30"; }else if (2 == i) { tempStr = @"11:30/13:00"; [self drawLabelAtRect:CGRectMake(colSpace*i-30, DPH-60 ,70,20) textStr:tempStr]; continue; }else if (3==i) { tempStr = @"14:00"; }else if (4 == i) { tempStr = @"15:00"; [self drawLabelAtRect:CGRectMake(colSpace*i - 30, DPH-60 ,30,20) textStr:tempStr]; continue; } [self drawLabelAtRect:CGRectMake(colSpace*i-15, DPH-60 ,35,20) textStr:tempStr]; } CAShapeLayer *shapeLayer = [[CAShapeLayer alloc]init]; shapeLayer.strokeColor = [UIColor lightGrayColor].CGColor; shapeLayer.path = path.CGPath; [self.layer addSublayer:shapeLayer]; }
3.画坐标轴上的文字
见2.画网格线
4.画分时线
说明:这里通过isNeedBackGroundColor控制是否画背景
- (void)drawTimeLine { if (self.isNeedBackGroundColor) { [self.timeLinePath addLineToPoint:CGPointMake(self.currentPoint.x , DPH - 60)]; self.timeLineLayer.fillColor = [UIColor lightGrayColor].CGColor; }else { self.timeLineLayer.fillColor = [UIColor clearColor].CGColor; } self.timeLineLayer.path = self.timeLinePath.CGPath; [self.layer addSublayer:self.timeLineLayer]; }
5.心跳效果
/**添加心跳效果*/ - (void)setupheartLayer { self.heartLayer.frame = CGRectMake(0, 0, 4, 4); self.heartLayer.position = self.currentPoint; self.heartLayer.cornerRadius = _heartLayer.frame.size.width*0.5; self.heartLayer.masksToBounds = YES; [self.layer addSublayer:self.heartLayer]; [self heartAnimationWithLayer:self.heartLayer]; }
6.添加手势
说明:
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长按手势 :触发方法画十字交叉线及其与坐标轴的交叉点文字
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点击手势: 影藏十字交叉线及对应文字
/**添加手势*/ - (void)setupGestureRecognize { UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressAction:)]; [self addGestureRecognizer:longPress]; UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap:)]; [self addGestureRecognizer:tap]; } /**长按*/ - (void)longPressAction:(UILongPressGestureRecognizer*)gesture { CGPoint tempPoint = [gesture locationInView:self]; //越界控制 if (tempPoint.x >= DPW) { tempPoint = CGPointMake(DPW, tempPoint.y); } if (tempPoint.x = DPH - 60) { tempPoint = CGPointMake(tempPoint.x, DPH-60); } if (tempPoint.y <= 0.0) { tempPoint = CGPointMake(tempPoint.x, 0); } if (gesture.state == UIGestureRecognizerStateBegan) { [self drawCrossLineWithPoint:tempPoint]; }else if (gesture.state == UIGestureRecognizerStateChanged) { [self drawCrossLineWithPoint:tempPoint]; }else if (gesture.state == UIGestureRecognizerStateEnded) { } } /**点击*/ - (void)tap:(UITapGestureRecognizer*) gesture { self.crossLayer.path = nil; [self.crossPriceLayer removeFromSuperlayer]; [self.crossTimeLayer removeFromSuperlayer]; }
完整代码 拿走不谢
#import "DPTimeLineView.h" #import "DPTimeLineItem.h" #define DPW self.frame.size.width #define DPH self.frame.size.height @interface DPTimeLineView () /**纵坐标最大值*/ @property (nonatomic, assign) double max; /**纵坐标中间值*/ @property (nonatomic, assign) double mid; /**纵坐标最小值*/ @property (nonatomic, assign) double min; /**分时线路径*/ @property (nonatomic, strong) UIBezierPath *timeLinePath; /**最新点坐标*/ @property (nonatomic, assign) CGPoint currentPoint; /**是否显示背景*/ @property (nonatomic, assign) BOOL isNeedBackGroundColor; /**心跳点*/ @property (nonatomic, strong) CALayer *heartLayer; /**分时线*/ @property (nonatomic, strong) CAShapeLayer *timeLineLayer; /**十字光标*/ @property (nonatomic, strong) CAShapeLayer *crossLayer; /**十字光标时间轴文字*/ @property (nonatomic, strong) CATextLayer *crossTimeLayer; /**十字光标价格轴文字*/ @property (nonatomic, strong) CATextLayer *crossPriceLayer; @end @implementation DPTimeLineView #pragma mark - 入口 //alloc方法调用 - (instancetype)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { self.backgroundColor = [UIColor whiteColor]; [self setupGestureRecognize]; } return self; } //load nib 调用 - (instancetype)initWithCoder:(NSCoder *)aDecoder { if (self = [super initWithCoder:aDecoder]) { self.backgroundColor = [UIColor whiteColor]; [self setupGestureRecognize]; } return self; } #pragma mark - 懒加载 - (UIBezierPath *)timeLinePath { if (!_timeLinePath) { _timeLinePath = [[UIBezierPath alloc]init]; } return _timeLinePath; } - (CALayer *)heartLayer { if (!_heartLayer) { _heartLayer = [CALayer layer]; _heartLayer.backgroundColor = [UIColor blueColor].CGColor; } return _heartLayer; } - (CAShapeLayer *)timeLineLayer { if (!_timeLineLayer) { _timeLineLayer = [[CAShapeLayer alloc]init]; _timeLineLayer.strokeColor = [UIColor redColor].CGColor; _timeLineLayer.lineWidth = 0.5f; } return _timeLineLayer; } - (CAShapeLayer *)crossLayer { if (!_crossLayer) { _crossLayer =[[CAShapeLayer alloc]init]; _crossLayer.lineDashPattern = @[@1, @2];//画虚线 } return _crossLayer; } - (CATextLayer *)crossPriceLayer { if (!_crossPriceLayer) { _crossPriceLayer = [[CATextLayer alloc]init]; } return _crossPriceLayer; } - (CATextLayer *)crossTimeLayer { if (!_crossTimeLayer) { _crossTimeLayer = [[CATextLayer alloc]init]; } return _crossTimeLayer; } #pragma mark - GestureRecognize /**添加手势*/ - (void)setupGestureRecognize { UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPressAction:)]; [self addGestureRecognizer:longPress]; UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap:)]; [self addGestureRecognizer:tap]; } /**长按*/ - (void)longPressAction:(UILongPressGestureRecognizer*)gesture { CGPoint tempPoint = [gesture locationInView:self]; //越界控制 if (tempPoint.x >= DPW) { tempPoint = CGPointMake(DPW, tempPoint.y); } if (tempPoint.x = DPH - 60) { tempPoint = CGPointMake(tempPoint.x, DPH-60); } if (tempPoint.y <= 0.0) { tempPoint = CGPointMake(tempPoint.x, 0); } if (gesture.state == UIGestureRecognizerStateBegan) { [self drawCrossLineWithPoint:tempPoint]; }else if (gesture.state == UIGestureRecognizerStateChanged) { [self drawCrossLineWithPoint:tempPoint]; }else if (gesture.state == UIGestureRecognizerStateEnded) { } } /**点击*/ - (void)tap:(UITapGestureRecognizer*) gesture { self.crossLayer.path = nil; [self.crossPriceLayer removeFromSuperlayer]; [self.crossTimeLayer removeFromSuperlayer]; } #pragma mark - 数据入口 - (void)setDataArrM:(NSMutableArray *)dataArrM { _dataArrM = dataArrM; //0.数据处理,拿到纵坐标数据 [self preworkForData]; //1.画框架 [self drawFramework]; //2.画文字 //3.画分时线 [self drawTimeLine]; //4.画末尾的心跳点 [self setupheartLayer]; } #pragma mark - 画图方法 1 - (void)drawTimeLine { if (self.isNeedBackGroundColor) { [self.timeLinePath addLineToPoint:CGPointMake(self.currentPoint.x , DPH - 60)]; self.timeLineLayer.fillColor = [UIColor lightGrayColor].CGColor; }else { self.timeLineLayer.fillColor = [UIColor clearColor].CGColor; } self.timeLineLayer.path = self.timeLinePath.CGPath; [self.layer addSublayer:self.timeLineLayer]; } /**画框架*/ - (void)drawFramework { UIBezierPath *path = [[UIBezierPath alloc]init]; //三条横线 CGFloat rowSpace = (DPH -60.0)/2.0; NSString *tempStr = @""; for (int i = 0; i < 3; i ++) { [path moveToPoint:CGPointMake(0,rowSpace*i)]; [path addLineToPoint:CGPointMake(DPW, rowSpace*i)]; if (0 == i) { tempStr = [NSString stringWithFormat:@"%.2f",self.max]; }else if (1==i) { tempStr = [NSString stringWithFormat:@"%.2f",self.mid]; }else if (2 == i) { tempStr = [NSString stringWithFormat:@"%.2f",self.min]; } [self drawLabelAtRect:CGRectMake(-25, rowSpace*i-10, 25, 20) textStr:tempStr]; } //4条竖线 CGFloat colSpace = DPW / 4.0; for (int i = 0; i < 5; i ++) { [path moveToPoint:CGPointMake(colSpace*i,0)]; [path addLineToPoint:CGPointMake(colSpace*i, DPH-60)]; if (0 == i) { tempStr = @"9:30"; [self drawLabelAtRect:CGRectMake(colSpace*i, DPH-60 ,30,20) textStr:tempStr]; continue; }else if (1==i) { tempStr = @"10:30"; }else if (2 == i) { tempStr = @"11:30/13:00"; [self drawLabelAtRect:CGRectMake(colSpace*i-30, DPH-60 ,70,20) textStr:tempStr]; continue; }else if (3==i) { tempStr = @"14:00"; }else if (4 == i) { tempStr = @"15:00"; [self drawLabelAtRect:CGRectMake(colSpace*i - 30, DPH-60 ,30,20) textStr:tempStr]; continue; } [self drawLabelAtRect:CGRectMake(colSpace*i-15, DPH-60 ,35,20) textStr:tempStr]; } CAShapeLayer *shapeLayer = [[CAShapeLayer alloc]init]; shapeLayer.strokeColor = [UIColor lightGrayColor].CGColor; shapeLayer.path = path.CGPath; [self.layer addSublayer:shapeLayer]; } /**画文字,直接创建一个CATextLayer*/ - (void)drawLabelAtRect:(CGRect)rect textStr:(NSString*)textStr { CATextLayer *textLayer = [CATextLayer layer]; textLayer.frame = rect; [self.layer addSublayer:textLayer]; //set text attributes textLayer.foregroundColor = [UIColor blackColor].CGColor; textLayer.alignmentMode = kCAAlignmentJustified; textLayer.wrapped = YES; //choose a font UIFont *font = [UIFont systemFontOfSize:10]; //set layer font CFStringRef fontName = (__bridge CFStringRef)font.fontName; CGFontRef fontRef = CGFontCreateWithFontName(fontName); textLayer.font = fontRef; textLayer.fontSize = font.pointSize; CGFontRelease(fontRef); textLayer.contentsScale = [UIScreen mainScreen].scale; //choose some text //set layer text textLayer.string = textStr; } /**画文字,指定CATextLayer*/ - (void)drawCrossLabelWithTextLayer:(CATextLayer*)textLayer AtRect:(CGRect)rect textStr:(NSString*)textStr { textLayer.frame = rect; [self.layer addSublayer:textLayer]; //set text attributes textLayer.foregroundColor = [UIColor blackColor].CGColor; textLayer.alignmentMode = kCAAlignmentJustified; textLayer.wrapped = YES; //choose a font UIFont *font = [UIFont systemFontOfSize:10]; //set layer font CFStringRef fontName = (__bridge CFStringRef)font.fontName; CGFontRef fontRef = CGFontCreateWithFontName(fontName); textLayer.font = fontRef; textLayer.fontSize = font.pointSize; CGFontRelease(fontRef); textLayer.contentsScale = [UIScreen mainScreen].scale; //choose some text //set layer text textLayer.string = textStr; } /**画十字光标线*/ - (void)drawCrossLineWithPoint:(CGPoint)point { UIBezierPath * path = [[UIBezierPath alloc]init]; [path moveToPoint:CGPointMake(point.x, 0)]; [path addLineToPoint:CGPointMake(point.x, DPH - 60)]; [path moveToPoint:CGPointMake(0, point.y)]; [path addLineToPoint:CGPointMake(DPH, point.y)]; self.crossLayer.strokeColor = [UIColor blueColor].CGColor; self.crossLayer.path = path.CGPath; [self.layer addSublayer: self.crossLayer]; //画坐标点对于文字 NSString *price = [self pricWithPoint:point]; NSString *time = [self timeWithPoint:point]; [self drawCrossLabelWithTextLayer:self.crossTimeLayer AtRect:CGRectMake(point.x, DPH-60, 30, 20) textStr:time]; [self drawCrossLabelWithTextLayer:self.crossPriceLayer AtRect:CGRectMake(0, point.y, 30, 20) textStr:price]; } /**添加心跳效果*/ - (void)setupheartLayer { self.heartLayer.frame = CGRectMake(0, 0, 4, 4); self.heartLayer.position = self.currentPoint; self.heartLayer.cornerRadius = _heartLayer.frame.size.width*0.5; self.heartLayer.masksToBounds = YES; [self.layer addSublayer:self.heartLayer]; [self heartAnimationWithLayer:self.heartLayer]; } #pragma mark - Others /**数据处理*/ - (void)preworkForData { //0 拿到纵坐标的3个点(max,mid,min),mid=昨日收盘价 DPTimeLineItem *temp = self.dataArrM[0]; self.mid = [temp.pre_close_px doubleValue]; if ([temp.last_px doubleValue] -[temp.pre_close_px doubleValue] > 0) { self.max = [temp.last_px doubleValue]; self.min = [temp.pre_close_px doubleValue] -([temp.last_px doubleValue] -[temp.pre_close_px doubleValue] ); }else { self.min = [temp.last_px doubleValue]; self.max = [temp.pre_close_px doubleValue] + ([temp.pre_close_px doubleValue] -[temp.last_px doubleValue] ); } for (int i = 0; i< self.dataArrM.count; i ++ ) { DPTimeLineItem *item = self.dataArrM[i]; //获取纵坐标最大,最小,中间值 if (fabs(item.last_px.doubleValue - self.mid) >(self.max - self.mid)) { self.max = self.mid +fabs(item.last_px.doubleValue - self.mid); self.min = self.mid - fabs(item.last_px.doubleValue - self.mid); } //画分时线 CGFloat timeX = [self miniteTimeWithTimeStr:item.curr_time]; CGFloat priceY = [self priceLabelLocationWithPrice:item.last_px.floatValue]; if (i == 0) { if (self.isNeedBackGroundColor) { [self.timeLinePath moveToPoint:CGPointMake(0, DPH - 60)]; [self.timeLinePath addLineToPoint:CGPointMake(timeX, priceY)]; }else { [self.timeLinePath moveToPoint:CGPointMake(timeX, priceY)]; } } if (i == self.dataArrM.count-1) { self.currentPoint = CGPointMake(timeX, priceY); } [self.timeLinePath addLineToPoint:CGPointMake(timeX, priceY)]; } } /**根据时间获取坐标点*/ -(CGFloat)miniteTimeWithTimeStr:(NSString*)timeStr { if (timeStr == nil || [timeStr isEqualToString:@""]) return 0.0; NSArray *temp = [timeStr componentsSeparatedByString:@":"]; NSInteger minte = [temp[0] integerValue]*60 + [temp[1] integerValue]; //每分钟代表的宽度 CGFloat aveWidth = DPW/ 240.0; if (minte DPW *0.5) { totalTime = aveWidth * point.x + 11*60;//下午 } int h = totalTime / 60; int m = ((int)(totalTime + 0.5)) % 60; str = [NSString stringWithFormat:@"%d:%d",h,m]; return str; } /**根据价格获取坐标位置*/ - (CGFloat)priceLabelLocationWithPrice:(CGFloat)price { CGFloat height = DPH - 60; CGFloat avrSpace = height/(self.max - self.min); return height - ((price - self.min)*avrSpace); } /**根据坐标位置获取价格*/ - (NSString*)pricWithPoint:(CGPoint)point { NSString *price = @""; //单位距离代表的价格 CGFloat avePrice = (self.max - self.min)/(DPH - 60); //保留两位小数 price = [NSString stringWithFormat:@"%.2f",(self.max - point.y*avePrice)+0.005]; return price; } /**心跳动画*/ - (void)heartAnimationWithLayer:(CALayer*)layer { CAAnimationGroup *group = [[CAAnimationGroup alloc]init]; group.duration = 0.5; group.repeatCount = HUGE; CABasicAnimation *scaleAnim = [CABasicAnimation animationWithKeyPath:@"transform.scale"]; scaleAnim.toValue = @1.2; CABasicAnimation *alphaAnim = [CABasicAnimation animationWithKeyPath:@"opacity"]; alphaAnim.toValue = @0.3f; group.animations = @[scaleAnim,alphaAnim]; [layer addAnimation:group forKey:nil]; }
提供一个数据入口,每次收到数据就重新划线
@class DPTimeLineItem; @interface DPTimeLineView : UIView /**分时数据列表*/ @property (nonatomic, strong)NSMutableArray *dataArrM; @end #pragma mark - 数据入口 - (void)setDataArrM:(NSMutableArray *)dataArrM { _dataArrM = dataArrM; //0.数据处理,拿到纵坐标数据 [self preworkForData]; //1.画框架 [self drawFramework]; //2.画文字 //3.画分时线 [self drawTimeLine]; //4.画末尾的心跳点 [self setupheartLayer]; }
备注:本文中之所以主要使用CAShapeLayer来画线,主要在于它的以下优势;
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渲染快,采用硬件加速,比用Core Graphics快很多;
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高效使用内存,由于不需要像普通layer那样创建寄宿图,所以无论改layer多大,都不要占用太多内存;
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超出图层依然可以绘图,不会被图层边界裁剪掉;
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不会出现像素化, CAShapeLayer在做3D变换时,不会像普通有寄宿图的CALayer那样变得像素画.
以上所述就是小编给大家介绍的《iOS-手把手教你画分时线》,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持!
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A Common-Sense Guide to Data Structures and Algorithms
Jay Wengrow / Pragmatic Bookshelf / 2017-8-13 / USD 45.95
If you last saw algorithms in a university course or at a job interview, you’re missing out on what they can do for your code. Learn different sorting and searching techniques, and when to use each. F......一起来看看 《A Common-Sense Guide to Data Structures and Algorithms》 这本书的介绍吧!