IOS空心饼图

1、封装类
.h

#import <UIKit/UIKit.h>
#define XYQColor(r, g, b)  [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
#define XYQRandomColor  XYQColor(arc4random_uniform(256), arc4random_uniform(256), arc4random_uniform(256))
@interface BezierCurveView : UIView

//初始化画布
+(instancetype)initWithFrame:(CGRect)frame;
-(void)drawPieChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues;
@end

.m

#import "BezierCurveView.h"

static CGRect myFrame;

@interface BezierCurveView ()

@end

@implementation BezierCurveView

//初始化画布
+(instancetype)initWithFrame:(CGRect)frame{
    
    BezierCurveView *bezierCurveView = [[BezierCurveView alloc]init]; 
    bezierCurveView.frame = frame;
    
    //背景视图
    UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
    backView.backgroundColor = [UIColor clearColor];
    [bezierCurveView addSubview:backView];
    
    myFrame = frame;
    return bezierCurveView;
}

// 画饼状图
-(void)drawPieChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues{
    
    //设置圆点
    CGPoint point = CGPointMake(self.frame.size.width/2, self.frame.size.height/2);
    CGFloat startAngle = 0;
    CGFloat endAngle ;
    CGFloat radius = 100;
    
    //计算总数
    __block CGFloat allValue = 0;
    [targetValues enumerateObjectsUsingBlock:^(NSNumber *targetNumber, NSUInteger idx, BOOL * _Nonnull stop) {
        allValue += [targetNumber floatValue];
    }];
    
    //画图
    for (int i =0; i<targetValues.count; i++) {
        
        CGFloat targetValue = [targetValues[i] floatValue];
        endAngle = startAngle + targetValue/allValue*2*M_PI;

        //bezierPath形成闭合的扇形路径
        UIBezierPath *bezierPath = [UIBezierPath bezierPathWithArcCenter:point
                                                                   radius:radius
                                                               startAngle:startAngle                                                                 endAngle:endAngle
                                                                clockwise:YES];
        [bezierPath addLineToPoint:point];
        [bezierPath closePath];
        
        
        //添加文字
        CGFloat X = point.x + 120*cos(startAngle+(endAngle-startAngle)/2) - 10;
        CGFloat Y = point.y + 110*sin(startAngle+(endAngle-startAngle)/2) - 10;
        UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(X, Y, 30, 20)];
        label.text = x_names[i];
        label.font = [UIFont systemFontOfSize:11];
        label.textColor = XYQColor(13, 195, 176);
        [self.subviews[0] addSubview:label];
        
        
        //渲染
        CAShapeLayer *shapeLayer=[CAShapeLayer layer];
        shapeLayer.lineWidth = 1;
        shapeLayer.fillColor = XYQRandomColor.CGColor;
        shapeLayer.path = bezierPath.CGPath;
        [self.layer addSublayer:shapeLayer];
        
        startAngle = endAngle;
    }
    //画一个白色的圆
    UIBezierPath *radiusPath = [UIBezierPath bezierPathWithArcCenter:point radius:50 startAngle:0 endAngle:2*M_PI clockwise:YES];
    [radiusPath addLineToPoint:point];
    [radiusPath closePath];
    CAShapeLayer *shapeLayer=[CAShapeLayer layer];
    shapeLayer.lineWidth = 1;
    shapeLayer.fillColor = [UIColor whiteColor].CGColor;
    shapeLayer.path = radiusPath.CGPath;
    [self.layer addSublayer:shapeLayer];
}

2、调用

#define SCREEN_W  [UIScreen mainScreen].bounds.size.width
#define SCREEN_H  [UIScreen mainScreen].bounds.size.height

    //1.初始化
    _bezierView = [BezierCurveView initWithFrame:CGRectMake(30, 30, SCREEN_W-60, 280)];
    _bezierView.center = self.view.center;
    [self.view addSubview:_bezierView];
    [_bezierView drawPieChartViewWithX_Value_Names:(NSMutableArray *)@[@"语文",@"数学",@"英语",@"物理",@"化学",@"生物",@"政治",@"历史",@"地理"] TargetValues:(NSMutableArray *)@[@60,@20,@50,@30,@90,@30,@100,@70, @20]];

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