ios - 如何制作 uiview 的波浪边框？

Question

我想让 UIView 的边框像波浪一样，但我就是不知道怎么做。我试过用这里找到的代码画一条波浪线，但它不起作用

CGRect rect = CGRectMake(100, 100, 500, 500);

self.heightCrest = 30;
float w = 0; // starting position
float y = rect.size.height;
float width = rect.size.width;
int cycles = 7;//number of waves
self.x  = width/cycles;
CGContextRef context = UIGraphicsGetCurrentContext();
CGMutablePathRef path = CGPathCreateMutable();
while (w<width) {
    CGPathMoveToPoint(path, NULL, w,y/2);
    CGPathAddQuadCurveToPoint(path, NULL, w+self.x/4, y/2 - self.heightCrest, w+self.x/2, y/2);
    CGPathAddQuadCurveToPoint(path, NULL, w+3*self.x/4, y/2 + self.heightCrest, w+self.x, y/2);
    w+=self.x;
}
CGContextAddPath(context, path);
CGContextDrawPath(context, kCGPathStroke);

Answer 1

像这样尝试:

- (void)addHorizontalDownwardCurveToPath:(UIBezierPath *)path toPoint:(CGPoint)point withAmplitude:(CGFloat)amplitude {
    CGFloat middle = (point.x + path.currentPoint.x) / 2;
    [path addQuadCurveToPoint:point
                 controlPoint:CGPointMake(middle, point.y + amplitude)];
}