//绘制一个饼状图 //构建数据 NSArray *data = @[@15, @30, @12, @18, @25];

//获取图形上下文 CGContextRef ref = UIGraphicsGetCurrentContext();

//创建路径 //确定圆心 CGPoint centerP = CGPointMake(rect.size.width * 0.5, rect.size.height * 0.5);

//半径 CGFloat r = MIN(rect.size.width, rect.size.height) * 0.5;

//起始弧度 CGFloat start = 0;

//终止弧度 CGFloat end = 0;

for (int i = 0; i < data.count; i ++) {

//计算起始和终止弧度

//终止弧度 end = [data[i] floatValue] / 100.0 * (M_PI * 2) + start;

//

UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:centerP radius:r startAngle:start endAngle:end clockwise:YES];

//连一条到中心点的线 [path addLineToPoint:centerP];

//路径添加到上下文中 CGContextAddPath(ref, path.CGPath);

//下一个扇形的起始弧度就是上一个扇形的终止弧度 start = end;

//设置颜色 [[UIColor colorWithRed:arc4random_uniform(256)/255.0 green:arc4random_uniform(256)/255.0 blue:arc4random_uniform(256)/255.0 alpha:1] set]; //渲染 CGContextDrawPath(ref, kCGPathFill); }

// //中间再画一个圆 // UIBezierPath *pathInside = [UIBezierPath bezierPathWithArcCenter:centerP radius:r - 50 startAngle:0 endAngle:M_PI * 2 clockwise:YES]; // CGContextAddPath(ref, pathInside.CGPath); // [self.backgroundColor set]; // CGContextDrawPath(ref, kCGPathFill);