iphone - 在两个对象之间画线

Question

我正在开发应用程序以使用我已经完成问答的 Line 匹配单词，但我想知道如何使用 Line 将特定问题与正确答案匹配。我正在使用数据库来显示问题答案

提前致谢

Answer 1

您可以从此链接获取源代码

并更改线的属性，如线宽更改、颜色等，请转到该源代码中的 EC189DrawingViewController 并在以下部分进行编辑

- (void)drawShapes {
//NSLog(@"In drawShapes!");

UIGraphicsBeginImageContext(_drawingPad.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();

for(myShape *i in _collection) {
    [self drawShapesSubroutine:i contextRef:context];
    if(i.selected == true) {
        CGContextSetLineWidth(context, 1.0f);
        CGContextSetStrokeColorWithColor(context, [[UIColor darkGrayColor] CGColor]);
        float num[] = {6.0, 6.0};
        CGContextSetLineDash(context, 0.0, num, 2);

        CGRect rectangle;
        [self drawShapeSelector:i selectorRect: &rectangle];
        CGContextAddRect(context, rectangle);        
        CGContextStrokePath(context);


        //tapped = true;
    }
}

if(!skipDrawingCurrentShape && (selectedIndex == -1)) {
    [self drawShapesSubroutine:_currentShape contextRef:context];
}
_drawingPad.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}