效果图:
基本原理［图来自官方文档］：
当前点［current point］、控制点［control point］和结束点［endPoint］之间的关系定义了实际的曲线。
函数代码实例：
#pragma mark画二次贝塞尔曲线
-(void)secondBeziePathDraw
{
UIBezierPath*path=[UIBezierPathbezierPath];
//起点[左侧]
[pathmoveToPoint:CGPointMake(20,self.frame.size.height-100)];
//二次曲线
[pathaddQuadCurveToPoint:CGPointMake(self.frame.size.width-30,self.frame.size.height-100)controlPoint:CGPointMake(self.frame.size.width/2,self.frame.size.height-10)];
path.lineWidth=8;
UIColor*sColor=[UIColorredColor];
[sColorset];
[pathstroke];
}
