How can i draw a bottom curve of the uiview using uibezierpath?

问题

I'm tried to draw a bottom curve on UIimageview using uibezierpath. I don't know how to do that?

    - (void)setMaskTo:(UIView*)view byRoundingCorners: 
   (UIRectCorner)corners
   {
      UIBezierPath *rounded = [UIBezierPath 
      bezierPathWithRoundedRect:view.bounds

      byRoundingCorners:corners

      cornerRadii:CGSizeMake(200.0, 200.0)];
      CAShapeLayer *shape = [[CAShapeLayer alloc] init];
      [shape setPath:rounded.CGPath];
      view.layer.mask = shape;
    }

i already tried like this https://imgur.com/a/WKykdyU

I expect the output of https://imgur.com/a/BqETMlc

回答1:

This should help you get going...

With a UIBezierPath:

• move to point A
• add quad curve to point B with control point C
• add line to point D
• add line to point E
• close the path

Here's a simple UIView subclass:

@implementation BottomCurveView

- (void)layoutSubviews {
    [super layoutSubviews];

    CGRect rect = self.bounds;
    CGFloat y = rect.size.height - 80.0;
    CGFloat curveTo = rect.size.height;

    UIBezierPath *myBez = [UIBezierPath new];
    [myBez moveToPoint:CGPointMake(0.0, y)];
    [myBez addQuadCurveToPoint:CGPointMake(rect.size.width, y) controlPoint:CGPointMake(rect.size.width / 2.0, curveTo)];
    [myBez addLineToPoint:CGPointMake(rect.size.width, 0.0)];
    [myBez addLineToPoint:CGPointMake(0.0, 0.0)];
    [myBez closePath];

    CAShapeLayer *maskForPath = [CAShapeLayer new];
    maskForPath.path = myBez.CGPath;
    [self.layer setMask:maskForPath];
}

@end

That produces the above image for a 200-pt tall view.

来源：https://stackoverflow.com/questions/57788503/how-can-i-draw-a-bottom-curve-of-the-uiview-using-uibezierpath