ios - 如何在两点之间画一条线 objective-C

Question

当试图在两点(imageViews)之间画一条线时，这条线是在另一个位置生成的。

这是我的代码:

- (void)drawLine:(UIView*)currentPoint endPoint:(UIImageView*)lastPoint{

    UIBezierPath* path = [UIBezierPath bezierPath];
    [path moveToPoint:currentPoint.center];
    [path addLineToPoint:lastPoint.center];


    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.path = [path CGPath];
    shapeLayer.strokeColor = [[UIColor whiteColor] CGColor];
    shapeLayer.lineWidth = 1.0;
    [self.DrawView.layer addSublayer:shapeLayer];

}

Answer 1

请确保您的currentPoint和lastPoint位于self.DrawView中。

您可以在 currentPoint.superview.layer 中添加行，如下所示

- (void)drawLine: (UIView*)currentPoint endPoint:(UIImageView*)lastPoint{
    UIBezierPath* path = [UIBezierPath bezierPath];
    [path moveToPoint:currentPoint.center];
    [path addLineToPoint:lastPoint.center];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.path = [path CGPath];
    shapeLayer.strokeColor = [[UIColor whiteColor] CGColor];
    shapeLayer.lineWidth = 1.0;
    [currentPoint.superview.layer addSublayer:shapeLayer];
}