如何在iOS中绘制梯形？

Question

我需要帮助在iOS中绘制梯形形状。

我使用以下代码绘制Pink形状，但它不起作用：

UIBezierPath* trianglePath = [UIBezierPath bezierPath];
[trianglePath moveToPoint:CGPointMake(0, 0)];
[trianglePath addLineToPoint:CGPointMake(topView.frame.size.width, topView.frame.size.height/2)];
[trianglePath addLineToPoint:CGPointMake(100, topView.frame.size.height/2)];

CAShapeLayer *triangleMaskLayer = [CAShapeLayer layer];
[triangleMaskLayer setPath:trianglePath.CGPath];

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0,topView.frame.size.height-150, 200, 150)];
view.layer.mask = triangleMaskLayer;
[self.view addSubview:view];

如何绘制粉红色的形状？

Answer 1

-(void)TriangularPinkView{
    UIBezierPath *path = [UIBezierPath bezierPath];
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.strokeColor = [[UIColor redColor] CGColor];
    shapeLayer.lineWidth = 0.5;

    CGPoint start = CGPointMake(CGRectGetMinX(self.pinkView.frame), CGRectGetMidY(self.pinkView.frame)+CGRectGetHeight(self.pinkView.frame)*.25);
    [path moveToPoint:start];
    [path addLineToPoint:CGPointMake(CGRectGetMaxX(self.pinkView.frame), CGRectGetMidY(self.pinkView.frame))];
    [path addLineToPoint:CGPointMake(CGRectGetMaxX(self.pinkView.frame), CGRectGetMaxY(self.pinkView.frame))];
    [path addLineToPoint:CGPointMake(CGRectGetMinX(self.pinkView.frame), CGRectGetMaxY(self.pinkView.frame))];


    shapeLayer.path = [path CGPath];
//    shapeLayer.fillRule = kCAFillRuleEvenOdd;
    shapeLayer.fillColor = [[UIColor redColor] CGColor];

    [self.view.layer addSublayer:shapeLayer];
}