iOS 画饼图

效果图：

核心代码：

#import "PieView.h"@implementation PieView- (void)drawRect:(CGRect)rect {    // Drawing code    NSArray *dataArray = @[@25,@25,@15,@15,@10,@10];    CGPoint center =  CGPointMake(self.bounds.size.width * 0.5, self.bounds.size.height * 0.5);    CGFloat radius = self.bounds.size.width * 0.5 - 10;    CGFloat startA = 0;    CGFloat angle = 0;    CGFloat endA = 0;    for (NSNumber *num in dataArray) {        startA = endA;        angle = num.intValue / 100.0 * M_PI * 2;        endA = startA + angle;        UIBezierPath  *path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES];        [[self randomColor] set];        //添加一根线到圆心        [path addLineToPoint:center];        [path fill];    }}-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    //重绘    [self setNeedsDisplay];}//生成一个随机的颜色- (UIColor *)randomColor {    CGFloat r = arc4random_uniform(256) / 255.0;    CGFloat g = arc4random_uniform(256) / 255.0;    CGFloat b = arc4random_uniform(256) / 255.0;   return  [UIColor colorWithRed:r green:g blue:b alpha:1];}//一个一个的画- (void)drawPie{    //画第一个扇形    CGPoint center =  CGPointMake(self.bounds.size.width * 0.5, self.bounds.size.height * 0.5);    CGFloat radius = self.bounds.size.width * 0.5 - 10;    CGFloat startA = 0;    CGFloat angle = 25 / 100.0 * M_PI * 2;    CGFloat endA = startA + angle;    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES];    [[UIColor redColor] set];    //添加一根线到圆心    [path addLineToPoint:center];    [path fill];    //画第二个扇形    startA = endA;    angle = 25 / 100.0 * M_PI * 2;    endA = startA + angle;    path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES];    [[UIColor greenColor] set];    //添加一根线到圆心    [path addLineToPoint:center];    [path fill];    startA = endA;    angle = 50 / 100.0 * M_PI * 2;    endA = startA + angle;    path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES];    [[UIColor blueColor] set];    //添加一根线到圆心    [path addLineToPoint:center];    [path fill];}@end