objective-c - Objective-C，重复相同的操作，但旋转 90 度

Question

我有一些代码，这是一小段摘录：

surfaceDimension = self.window.frame.size.height;
sliderDistancePerPoint = 1.0f / surfaceDimension / FINGER_RATIO;
addThisToSlider = sliderDistancePerPoint * diff * 1.6f;

在一个子类中，我覆盖了这个方法，并重复相同的代码，但旋转了：

surfaceDimension = self.window.frame.size.width;
sliderDistancePerPoint = 1.0f / surfaceDimension / FINGER_RATIO;
addThisToSlider = sliderDistancePerPoint * diff * 1.6f;

我可以通过哪些（各种）方法来虚拟化此代码以便它可以在任一方向上工作？我当然可以制作surfaceDimension一个方法，但我需要对所有依赖项重复此操作。其他想法？

Answer 1

使用标准的 OO 实践并使方法足够通用，您可以很容易地进行此操作。这是一个相当不错的继承使用

// override in subclass
- (BOOL) useXOrientation {
    return NO;
}

- (CGPoint) setOriginFrom:(CGPoint)sourcePoint to:(CGPoint)targetPoint {
    if (self.useXOrientation)
        targetPoint.x = sourcePoint.x;
    else
        targetPoint.y = sourcePoint.y;
    return targetPoint;
}



- (float) sizeOfDimension:(CGSize)size {
    if (self.useXOrientation)
        return size.width;
    else
        return size.height;
}

// example method
- (void) resetFirstTouch:(CGPoint)point {
    self.firstTouch = [self setOriginFrom:point to:self.firstTouch];
    self.firstTouchInParent = [self setOriginFrom:[self convertPoint:self.firstTouch toView:self.superview] to:self.firstTouchInParent];
}