iOS ~ 貝塞爾曲線：二階曲線圖??，ShapeLayer

原理：

// 起始點(diǎn)
- (void)moveToPoint:(CGPoint)point;
// 二階曲線（兩個(gè)控制點(diǎn)）
- (void)addCurveToPoint:(CGPoint)endPoint controlPoint1:(CGPoint)controlPoint1 controlPoint2:(CGPoint)controlPoint2;
原理（這里的天氣溫度曲線）：endPoint：下一個(gè)端點(diǎn)的x、y軸坐標(biāo)， controlPoint1：X軸坐標(biāo)是上一個(gè)startPoint.x和下一個(gè)endPoint.x的中間X坐標(biāo)位置，Y軸是和上一個(gè)startPoint.y， controlPoint2：X軸坐標(biāo)是上一個(gè)startPoint.x和下一個(gè)endPoint.x的中間X坐標(biāo)位置，Y軸是和下一個(gè)endPoint.y，

關(guān)鍵代碼：

if (k == 0) { // 第一個(gè)，特殊處理
    // 第一個(gè)點(diǎn)，起始點(diǎn)。
    [weather_MaxTempPath moveToPoint:CGPointMake([UIScreen mainScreen].bounds.size.width/375*67/2, [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (nextTemp - minTemp)))];
            
    } else {
            
    GWCW_ClubWeather_DailyWeatherModel *dailyWeatherModel0 = self.dailyWeathers[k-1];
    CGFloat lastTemp = [dailyWeatherModel0.day_MaxTemp floatValue];
            
    // 原理（這里的天氣溫度曲線）：endPoint：下一個(gè)端點(diǎn)的x、y軸坐標(biāo)， controlPoint1：X軸坐標(biāo)是上一個(gè)startPoint.x和下一個(gè)endPoint.x的中間X坐標(biāo)位置，Y軸是和上一個(gè)startPoint.y， controlPoint2：X軸坐標(biāo)是上一個(gè)startPoint.x和下一個(gè)endPoint.x的中間X坐標(biāo)位置，Y軸是和下一個(gè)endPoint.y，
    [weather_MaxTempPath addCurveToPoint:CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*k) , [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (nextTemp - minTemp)))
                        controlPoint1:CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*k - 67/2), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (lastTemp - minTemp)))
                        controlPoint2:CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*k - 67/2), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * ((nextTemp - minTemp))))];
}
代碼：
@property (nonatomic, strong) UIView        *top_LineRangeView; // 折線圖??的范圍父view（溫度）
@property (nonatomic, strong) UIView        *top_LineLayerRangeView; // 折線圖??的范圍父view（折線圖layer）
@property (nonatomic, strong) CAShapeLayer  *top_lineFatherLayer; // // 折線圖的父layer

- (void)refreshTableFooterView {
    
    /** 未來15日的預(yù)報(bào)： */
    [self.top_LineRangeView removeFromSuperview];
    [self.top_LineLayerRangeView removeFromSuperview];
    [self.top_lineFatherLayer removeFromSuperlayer];
    
    // 為防止缺少數(shù)據(jù)，這里重新設(shè)置一下scrollview 的內(nèi)容寬度:
    self.top_chartContentScrollView.contentSize = CGSizeMake([UIScreen mainScreen].bounds.size.width/375*(67*self.dailyWeathers.count), self.top_chartContentScrollView.frame.size.height);
    
    /**!!! 創(chuàng)建溫度的背景view，（15天的 天氣預(yù)覽）  !!!*/
    _top_LineRangeView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.top_chartContentScrollView.contentSize.width, [UIScreen mainScreen].bounds.size.width/375*120)];
    self.top_LineRangeView.backgroundColor = [UIColor clearColor];
    self.top_LineRangeView.userInteractionEnabled = NO;
    [self.top_chartContentView addSubview:self.top_LineRangeView];
    
    _top_LineLayerRangeView = [[UIView alloc] initWithFrame:CGRectMake(0, [UIScreen mainScreen].bounds.size.width/375*25, self.top_chartContentScrollView.contentSize.width, [UIScreen mainScreen].bounds.size.width/375*(120 - 50))];
    self.top_LineLayerRangeView.backgroundColor = [UIColor clearColor];
    self.top_LineLayerRangeView.userInteractionEnabled = NO;
    [self.top_chartContentView addSubview:self.top_LineLayerRangeView];
    
    
    /** 1、創(chuàng)建曲線圖的父layer：120 - 50 = 70 */
    _top_lineFatherLayer = [[CAShapeLayer alloc] init];
    _top_lineFatherLayer.strokeColor = [UIColor clearColor].CGColor;
    
    UIBezierPath *bezierPath = [UIBezierPath
                                    bezierPathWithRoundedRect:CGRectMake(0, 0, self.top_chartContentScrollView.contentSize.width, [UIScreen mainScreen].bounds.size.width/375*(120 - 50))
                                    byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight
                                    cornerRadii:CGSizeMake([UIScreen mainScreen].bounds.size.width/375*0, [UIScreen mainScreen].bounds.size.width/375*0)];

    _top_lineFatherLayer.lineWidth = [UIScreen mainScreen].bounds.size.width/375*0.01;
    // 顏色
    _top_lineFatherLayer.strokeColor = [UIColor clearColor].CGColor;
    // 背景填充色
    _top_lineFatherLayer.fillColor = [UIColor clearColor].CGColor;
    _top_lineFatherLayer.path = [bezierPath CGPath];
    [self.top_LineLayerRangeView.layer addSublayer:self.top_lineFatherLayer];
    
    /// 先找到15天的 最大溫度和最低溫度：(獲取曲線圖??的范圍)
    CGFloat maxTemp = 0;
    CGFloat minTemp = 0;
    
    NSMutableArray *temp_array = [NSMutableArray arrayWithCapacity:0];
    
    for (GWCW_ClubWeather_DailyWeatherModel *dailyWeatherModel in self.dailyWeathers) {
        NSString *day_MaxTemp = [NSString stringWithFormat:@"%@", dailyWeatherModel.day_MaxTemp];
        NSString *day_MinTemp = [NSString stringWithFormat:@"%@", dailyWeatherModel.day_MinTemp];
        // 15天內(nèi)的所有最高溫、最低溫 都放到數(shù)組，（之下的for循環(huán)，獲取全部溫度中的最高溫、最低溫）
        [temp_array addObject:day_MaxTemp];
        [temp_array addObject:day_MinTemp];
    }
    
    for (int i = 0; i < temp_array.count; i++) {

        NSString *temp = [NSString stringWithFormat:@"%@", temp_array[i]];
        CGFloat i_temp = [temp floatValue];
        
//            NSLog(@"一天的溫度???? %.2f ????", i_temp);
        if (i == 0) {
            maxTemp = i_temp;
            minTemp = i_temp;
        }

        if (maxTemp > i_temp) {
            maxTemp = maxTemp;
        } else {
            maxTemp = i_temp;
        }
        if (minTemp > i_temp) {
            minTemp = i_temp;
        } else {
            minTemp = minTemp;
        }
    }
    
    // 溫度之差 的 溫度范圍：溫度三種情況都是這個(gè)減法獲取溫度的范圍
    CGFloat maxTempRange = maxTemp - minTemp;
    double maxTempRange_value = 0;
    if (maxTempRange == 0) {
        maxTempRange_value = 0;
    } else {
        maxTempRange_value = 70 / maxTempRange;
    }
    /** 最高溫 path */
    UIBezierPath *weather_MaxTempPath = [UIBezierPath bezierPath];
    
    // 設(shè)置path的 起始點(diǎn) 和 其他點(diǎn)
    for (int k = 0; k < self.dailyWeathers.count; k++) {
        GWCW_ClubWeather_DailyWeatherModel *dailyWeatherModel = self.dailyWeathers[k];
        CGFloat nextTemp = [dailyWeatherModel.day_MaxTemp floatValue];
        
        // 兩個(gè)相鄰 端點(diǎn) 的位置間隔：67
        
        if (k == 0) { // 第一個(gè)，特殊處理
            // 第一個(gè)點(diǎn)，起始點(diǎn)。
            [weather_MaxTempPath moveToPoint:CGPointMake([UIScreen mainScreen].bounds.size.width/375*67/2, [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (nextTemp - minTemp)))];
            
        } else {
            
            GWCW_ClubWeather_DailyWeatherModel *dailyWeatherModel0 = self.dailyWeathers[k-1];
            CGFloat lastTemp = [dailyWeatherModel0.day_MaxTemp floatValue];
            
            // 原理（這里的天氣溫度曲線）：endPoint：下一個(gè)端點(diǎn)的x、y軸坐標(biāo)， controlPoint1：X軸坐標(biāo)是上一個(gè)startPoint.x和下一個(gè)endPoint.x的中間X坐標(biāo)位置，Y軸是和上一個(gè)startPoint.y， controlPoint2：X軸坐標(biāo)是上一個(gè)startPoint.x和下一個(gè)endPoint.x的中間X坐標(biāo)位置，Y軸是和下一個(gè)endPoint.y，
            [weather_MaxTempPath addCurveToPoint:CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*k) , [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (nextTemp - minTemp)))
                        controlPoint1:CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*k - 67/2), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (lastTemp - minTemp)))
                        controlPoint2:CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*k - 67/2), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * ((nextTemp - minTemp))))];
        }
        
    }
    
    CAShapeLayer *maxTemp_Layer = [[CAShapeLayer alloc] init];
    // 線寬
    maxTemp_Layer.lineWidth = [UIScreen mainScreen].bounds.size.width/375*2;
    // 線條的顏色
    maxTemp_Layer.strokeColor = RGBA(255, 195, 85, 1).CGColor;
    // 背景填充色
    maxTemp_Layer.fillColor = [UIColor clearColor].CGColor;
    // 將UIBezierPath類轉(zhuǎn)換成CGPath，類似于UIColor的CGColor
    maxTemp_Layer.path = [weather_MaxTempPath CGPath];
    [self.top_lineFatherLayer addSublayer:maxTemp_Layer];
    
    
    /** 最低溫 path */
    UIBezierPath *weather_MinTempPath = [UIBezierPath bezierPath];
    
    // 設(shè)置path的 起始點(diǎn) 和 其他點(diǎn)
    for (int k = 0; k < self.dailyWeathers.count; k++) {
        GWCW_ClubWeather_DailyWeatherModel *dailyWeatherModel = self.dailyWeathers[k];
        CGFloat nextTemp = [dailyWeatherModel.day_MinTemp floatValue];
        
        // 兩個(gè)相鄰 端點(diǎn) 的位置間隔：67
        
        if (k == 0) { // 第一個(gè)，特殊處理
            // 第一個(gè)點(diǎn)，起始點(diǎn)。
            [weather_MinTempPath moveToPoint:CGPointMake([UIScreen mainScreen].bounds.size.width/375*67/2, [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (nextTemp - minTemp)))];
            
        } else {
            
            GWCW_ClubWeather_DailyWeatherModel *dailyWeatherModel0 = self.dailyWeathers[k-1];
            CGFloat lastTemp = [dailyWeatherModel0.day_MinTemp floatValue];
            
            // 原理（這里的天氣溫度曲線）：endPoint：下一個(gè)端點(diǎn)的x、y軸坐標(biāo)， controlPoint1：X軸坐標(biāo)是上一個(gè)startPoint.x和下一個(gè)endPoint.x的中間X坐標(biāo)位置，Y軸是和上一個(gè)startPoint.y， controlPoint2：X軸坐標(biāo)是上一個(gè)startPoint.x和下一個(gè)endPoint.x的中間X坐標(biāo)位置，Y軸是和下一個(gè)endPoint.y，
            [weather_MinTempPath addCurveToPoint:CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*k) , [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (nextTemp - minTemp)))
                        controlPoint1:CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*k - 67/2), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (lastTemp - minTemp)))
                        controlPoint2:CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*k - 67/2), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * ((nextTemp - minTemp))))];
        }
        
    }
    
    CAShapeLayer *minTemp_Layer = [[CAShapeLayer alloc] init];
    // 線寬
    minTemp_Layer.lineWidth = [UIScreen mainScreen].bounds.size.width/375*2;
    // 線條的顏色
    minTemp_Layer.strokeColor = RGBA(84, 189, 255, 1).CGColor;
    // 背景填充色
    minTemp_Layer.fillColor = [UIColor clearColor].CGColor;
    // 將UIBezierPath類轉(zhuǎn)換成CGPath，類似于UIColor的CGColor
    minTemp_Layer.path = [weather_MinTempPath CGPath];
    [self.top_lineFatherLayer addSublayer:minTemp_Layer];
    
    
    
    // 所有的曲線端點(diǎn)（小圓點(diǎn)）的位置：CGPoint
    NSMutableArray *max_circleArray = [NSMutableArray arrayWithCapacity:0];
    NSMutableArray *min_circleArray = [NSMutableArray arrayWithCapacity:0];
    for (int j = 0; j < self.dailyWeathers.count; j++) {
        
        GWCW_ClubWeather_DailyWeatherModel *dailyWeatherModel = self.dailyWeathers[j];
        CGFloat max_temp = [dailyWeatherModel.day_MaxTemp floatValue];
        CGFloat min_temp = [dailyWeatherModel.day_MinTemp floatValue];
        
        // 最高溫
        if (j == 0) {
            
            // 端點(diǎn)位置CGPoint
            CGPoint circlePoint = CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (max_temp - minTemp)));
            
            NSValue* circleValue = [NSValue valueWithCGPoint:circlePoint];
            [max_circleArray addObject:circleValue];
        } else {
            CGPoint circlePoint = CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*j), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (max_temp - minTemp)));
            
            NSValue* circleValue = [NSValue valueWithCGPoint:circlePoint];
            [max_circleArray addObject:circleValue];
        }
        
        UILabel *max_TempL = [[UILabel alloc] initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width/375*(67*j), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (max_temp - minTemp)), [UIScreen mainScreen].bounds.size.width/375*67, [UIScreen mainScreen].bounds.size.width/375*16)];
        max_TempL.text = [NSString stringWithFormat:@"%@", dailyWeatherModel.day_MaxTemp];
        max_TempL.textColor = RGBA(0, 0, 0, 0.45);
        max_TempL.textAlignment = NSTextAlignmentCenter;
        max_TempL.font = [UIFont systemFontOfSize:[UIScreen mainScreen].bounds.size.width/375*15 weight:UIFontWeightRegular];
        [self.top_LineRangeView addSubview:max_TempL];
        
        
        
        // 最低溫
        if (j == 0) {
            
            // 端點(diǎn)位置CGPoint
            CGPoint circlePoint = CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (min_temp - minTemp)));
            
            NSValue* circleValue = [NSValue valueWithCGPoint:circlePoint];
            [min_circleArray addObject:circleValue];
        } else {
            CGPoint circlePoint = CGPointMake([UIScreen mainScreen].bounds.size.width/375*(67/2 + 67*j), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (min_temp - minTemp)));
            
            NSValue* circleValue = [NSValue valueWithCGPoint:circlePoint];
            [min_circleArray addObject:circleValue];
        }
        
        UILabel *min_TempL = [[UILabel alloc] initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width/375*(67*j), [UIScreen mainScreen].bounds.size.width/375*(70 - maxTempRange_value * (min_temp - minTemp) + 16*2 + 1), [UIScreen mainScreen].bounds.size.width/375*67, [UIScreen mainScreen].bounds.size.width/375*16)];
        min_TempL.text = [NSString stringWithFormat:@"%@", dailyWeatherModel.day_MinTemp];
        min_TempL.textColor = RGBA(0, 0, 0, 0.45);
        min_TempL.textAlignment = NSTextAlignmentCenter;
        min_TempL.font = [UIFont systemFontOfSize:[UIScreen mainScreen].bounds.size.width/375*15 weight:UIFontWeightRegular];
        [self.top_LineRangeView addSubview:min_TempL];
       
    }
    
    self.top_CollectionView.hidden = NO;
    if (self.dailyWeathers.count > 0) {
        
        self.hourlyWeather = self.dailyWeathers[0].hourlyWeather;
        [self dayWeather:self.dailyWeathers[0]];
    }
    
    
}
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