使用CAShapeLayer画视图尖角

x y z 分别是尖角的三个顶点的x坐标，从左到右排列      后面的[UIScreen mainScreen].bounds.size.height -65 是y坐标  与x坐标一一对应

- (void)shapeChange:(int)x Pointy:(int)y Pointz:(int)z{

/*形状*/

self.shapeLayer = [CAShapeLayer layer];

//self.shapeLayer.strokeColor = [UIColor greenColor].CGColor;

self.shapeLayer.fillColor = [UIColor whiteColor].CGColor;

self.shapeLayer.lineWidth = 1;

/*路径*/

CGMutablePathRef path = CGPathCreateMutable();

CGPathMoveToPoint(path, NULL,x ,[UIScreen mainScreen].bounds.size.height -65);

CGPathAddLineToPoint(path, NULL, y, [UIScreen mainScreen].bounds.size.height -53);

CGPathAddLineToPoint(path, NULL, z, [UIScreen mainScreen].bounds.size.height -65);

self.shapeLayer.path = path;

self.shapeLayer.frame = self.heatab

.view.bounds;

[self.bgview.layer addSublayer:self.shapeLayer];

}