Question

我有ImageView包含圆形渐变和panGestureRecognizer，我想专门限制渐变，以防止干扰视图或白色背景中的UISliders。< / p>

我如何只识别渐变内的触摸？

截至目前，我正在使用这个等式，结果不好：

        CGPoint lastPoint = [sender locationOfTouch: sender.numberOfTouches - 1 inView: gradientView];
        CGPoint center = CGPointMake((size.width/2), (size.height /2));

这些变量用于指示渐变的中心。这是等式：

        if((lastPoint.x - center.x) + (lastPoint.y - center.y)/2 < radius)
        {
            UIColor *color = [UIColor colorWithHue: angle / (M_PI * 2.0) saturation:saturationSlider.value brightness:hellSlider.value alpha:alphaSlider.value];
            if ([color getRed: &r green: &g blue:&b alpha: &a])
            {
                NSLog(@"Color value - R : %g G : %g : B %g", r*255, g*255, b*255);
            }
            float red = r;
            float green = g;
            float blue = b;
            rText.text = [NSString stringWithFormat:@"%.0f",rSlider.value];
            gText.text = [NSString stringWithFormat:@"%.0f",green*255];
            bText.text = [NSString stringWithFormat:@"%.0f",blue*255];


            colorView.backgroundColor = [UIColor colorWithRed:(rText.text.floatValue/255) green:(gText.text.floatValue/255) blue:(bText.text.floatValue/255) alpha:alphaSlider.value];
            rSlider.value = red*255;
            gSlider.value = green*255;
            bSlider.value = blue*255;
            alphaText.text = [NSString stringWithFormat:@"%.2f",alphaSlider.value];
            brightnessText.text = [NSString stringWithFormat:@"%.2f",hellSlider.value];
            saturationText.text = [NSString stringWithFormat:@"%.2f",saturationSlider.value];

        }

上面的代码在我的panGestureRecognizer方法中。

Answer 1

您可以在该圆形视图的顶部添加另一个UIView，并将手势应用于该视图。

UIView *gestureView = [[UIView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
[gestureView.layer setCornerRadius:gestureView.frame.size.width/2];

这会给您一个循环UIView。 根据需要调整大小和位置。

将平移手势识别器限制为ImageView？

1 个答案: