原理：
// 起始点
- (void)moveToPoint:(CGPoint)point;
// 二阶曲线（两个控制点）
- (void)addCurveToPoint:(CGPoint)endPoint controlPoint1:(CGPoint)controlPoint1 controlPoint2:(CGPoint)controlPoint2;
原理（这里的天气温度曲线）：endPoint：下一个端点的x、y轴坐标， controlPoint1：X轴坐标是上一个startPoint.x和下一个endPoint.x的中间X坐标位置，Y轴是和上一个startPoint.y， controlPoint2：X轴坐标是上一个startPoint.x和下一个endPoint.x的中间X坐标位置，Y轴是和下一个endPoint.y，
关键代码：
if (k == 0) { // 第一个，特殊处理
// 第一个点，起始点。
[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（这里的天气温度曲线）：endPoint：下一个端点的x、y轴坐标， controlPoint1：X轴坐标是上一个startPoint.x和下一个endPoint.x的中间X坐标位置，Y轴是和上一个startPoint.y， controlPoint2：X轴坐标是上一个startPoint.x和下一个endPoint.x的中间X坐标位置，Y轴是和下一个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))))];
}
代码：
@property (nonatomic, strong) UIView *top_LineRangeView; // 折线图📈的范围父view（温度）
@property (nonatomic, strong) UIView *top_LineLayerRangeView; // 折线图📈的范围父view（折线图layer）
@property (nonatomic, strong) CAShapeLayer *top_lineFatherLayer; // // 折线图的父layer
- (void)refreshTableFooterView {
/** 未来15日的预报： */
[self.top_LineRangeView removeFromSuperview];
[self.top_LineLayerRangeView removeFromSuperview];
[self.top_lineFatherLayer removeFromSuperlayer];
// 为防止缺少数据，这里重新设置一下scrollview 的内容宽度:
self.top_chartContentScrollView.contentSize = CGSizeMake([UIScreen mainScreen].bounds.size.width/375*(67*self.dailyWeathers.count), self.top_chartContentScrollView.frame.size.height);
/**!!! 创建温度的背景view，（15天的 天气预览） !!!*/
_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、创建曲线图的父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;
// 颜色
_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 最大温度和最低温度：(获取曲线图📈的范围)
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天内的所有最高温、最低温 都放到数组，（之下的for循环，获取全部温度中的最高温、最低温）
[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(@"一天的温度😆😆 %.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;
}
}
// 温度之差 的 温度范围：温度三种情况都是这个减法获取温度的范围
CGFloat maxTempRange = maxTemp - minTemp;
double maxTempRange_value = 0;
if (maxTempRange == 0) {
maxTempRange_value = 0;
} else {
maxTempRange_value = 70 / maxTempRange;
}
/** 最高温 path */
UIBezierPath *weather_MaxTempPath = [UIBezierPath bezierPath];
// 设置path的 起始点 和 其他点
for (int k = 0; k < self.dailyWeathers.count; k++) {
GWCW_ClubWeather_DailyWeatherModel *dailyWeatherModel = self.dailyWeathers[k];
CGFloat nextTemp = [dailyWeatherModel.day_MaxTemp floatValue];
// 两个相邻 端点 的位置间隔：67
if (k == 0) { // 第一个，特殊处理
// 第一个点，起始点。
[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（这里的天气温度曲线）：endPoint：下一个端点的x、y轴坐标， controlPoint1：X轴坐标是上一个startPoint.x和下一个endPoint.x的中间X坐标位置，Y轴是和上一个startPoint.y， controlPoint2：X轴坐标是上一个startPoint.x和下一个endPoint.x的中间X坐标位置，Y轴是和下一个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];
// 线宽
maxTemp_Layer.lineWidth = [UIScreen mainScreen].bounds.size.width/375*2;
// 线条的颜色
maxTemp_Layer.strokeColor = RGBA(255, 195, 85, 1).CGColor;
// 背景填充色
maxTemp_Layer.fillColor = [UIColor clearColor].CGColor;
// 将UIBezierPath类转换成CGPath，类似于UIColor的CGColor
maxTemp_Layer.path = [weather_MaxTempPath CGPath];
[self.top_lineFatherLayer addSublayer:maxTemp_Layer];
/** 最低温 path */
UIBezierPath *weather_MinTempPath = [UIBezierPath bezierPath];
// 设置path的 起始点 和 其他点
for (int k = 0; k < self.dailyWeathers.count; k++) {
GWCW_ClubWeather_DailyWeatherModel *dailyWeatherModel = self.dailyWeathers[k];
CGFloat nextTemp = [dailyWeatherModel.day_MinTemp floatValue];
// 两个相邻 端点 的位置间隔：67
if (k == 0) { // 第一个，特殊处理
// 第一个点，起始点。
[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（这里的天气温度曲线）：endPoint：下一个端点的x、y轴坐标， controlPoint1：X轴坐标是上一个startPoint.x和下一个endPoint.x的中间X坐标位置，Y轴是和上一个startPoint.y， controlPoint2：X轴坐标是上一个startPoint.x和下一个endPoint.x的中间X坐标位置，Y轴是和下一个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];
// 线宽
minTemp_Layer.lineWidth = [UIScreen mainScreen].bounds.size.width/375*2;
// 线条的颜色
minTemp_Layer.strokeColor = RGBA(84, 189, 255, 1).CGColor;
// 背景填充色
minTemp_Layer.fillColor = [UIColor clearColor].CGColor;
// 将UIBezierPath类转换成CGPath，类似于UIColor的CGColor
minTemp_Layer.path = [weather_MinTempPath CGPath];
[self.top_lineFatherLayer addSublayer:minTemp_Layer];
// 所有的曲线端点（小圆点）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];
// 最高温
if (j == 0) {
// 端点位置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];
// 最低温
if (j == 0) {
// 端点位置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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