iOS 使用UIBezierPath绘制圆型, 并且根据半径, 角度, 长度在圆外任意一点绘制线段, 通常用于饼状图的文字说明

来源：互联网发布：小米手机网络信号不好编辑：程序博客网时间：2024/04/29 09:24

继承UIView, 自定义一个View

重写方法

- (void)drawRect:(CGRect)rect

完整代码:

- (instancetype)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self)    {        self.backgroundColor = [UIColor whiteColor];    }    return self;}- (void)drawRect:(CGRect)rect{    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(100, 100) radius:50 startAngle:0 endAngle:360 clockwise:YES];        [path stroke];        UIBezierPath *path2 = [UIBezierPath bezierPath];    [path2 moveToPoint:CGPointMake(100, 100)];    [path2 addLineToPoint:[self calcCircleCoordinateWithCenter:CGPointMake(100, 100) angle:10 radius:60]];    [path2 stroke];}#pragma mark 计算圆圈上点在IOS系统中的坐标- (CGPoint)calcCircleCoordinateWithCenter:(CGPoint)center angle:(CGFloat)angle radius:(CGFloat)radius{    CGFloat x2 = radius * cosf(angle * M_PI / 180);    CGFloat y2 = radius * sinf(angle * M_PI / 180);    return CGPointMake(center.x + x2, center.y - y2);}

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