垂直UISlider约束
问题描述:
我正在创建垂直UISlider。我创建了使用所有代码的视图。 (其余的故事板元素使用接口生成器进行约束)垂直UISlider约束
从我已阅读的内容中,创建一个垂直UISlider,然后旋转它给UISlider一个宽度。由于UISlider所在容器的高度因屏幕尺寸而异,我不想给它固定的高度(宽度)。
这是我在想什么
// Mark: Slider View
let leftSlider = UISlider()
let centerSlider = UISlider()
let rightSlider = UISlider()
let colorSliders = [leftSlider, centerSlider, rightSlider]
for slider in colorSliders {
slider.translatesAutoresizingMaskIntoConstraints = false
sliderContainer.addSubview(slider)
let w = sliderContainer.bounds.width
slider.bounds.size.width = w
slider.center = CGPoint(x: w/2, y: w/2)
slider.transform = CGAffineTransform(rotationAngle: CGFloat(-M_PI_2))
slider.value = 0
slider.minimumValue = 0
slider.maximumValue = 255
let sliderTopConstraint = slider.topAnchor.constraint(equalTo: centerHiddenView.bottomAnchor, constant: 5)
let sliderBottomConstraint = slider.bottomAnchor.constraint(equalTo: sliderContainer.bottomAnchor, constant: 5)
NSLayoutConstraint.activate([sliderTopConstraint, sliderBottomConstraint])
slider.backgroundColor = .purple
slider.isEnabled = true
slider.isUserInteractionEnabled = true
}
let sliderContainerWidth: CGFloat = sliderContainer.frame.width
let centerSliderHorizontalConstraints = centerSlider.centerXAnchor.constraint(equalTo: sliderContainer.centerXAnchor)
let widthConstraint = centerSlider.widthAnchor.constraint(equalToConstant: sliderContainerWidth)
let centerSliderWidthConstraint = centerSlider.widthAnchor.constraint(equalToConstant: 90)
NSLayoutConstraint.activate([centerSliderHorizontalConstraints, centerSliderWidthConstraint, widthConstraint])
但是当我运行它,我得到这个
这远远比我今天早些时候有更好的。然而,我想滑块是正常的宽度..以及看起来正常只是垂直
任何想法我错过了什么? (呵呵忽略小紫分支到左侧,这是其他2个滑块,我加入,但没有限制呢。)
答
你改变bounds
和你UISlider
的transform
并使用自动 - 同时布局,这样可能会有点混乱。
我建议你不要修改bounds
,而是使用自动布局。您应该将滑块宽度设置为其超级视图高度,并将滑块置于其超级视图内。这样,当你旋转它时,其实际上它的宽度(旋转之前)的高度(旋转之后)将等于它的超级视图高度。垂直居中滑块将确保滑块触摸其超视图的底部和顶部。
slider.widthAnchor.constraint(equalTo: sliderContainer.heightAnchor
slider.centerYAnchor.constraint(equalTo: sliderContainer.centerYAnchor)
slider.centerXAnchor.constraint(equalTo: sliderContainer.centerXAnchor)
如果要放置剩余的2个滑块向左或他们的上海华盈的权利之一,不水平居中,但千万不要使用以下:
slider.leadingAnchor.constraint(equalTo: sliderContainer.leadingAnchor)
slider.trailingAnchor.constraint(equalTo: sliderContainer.trailingAnchor)
此外,仔细检查您的控制台用于自动布局错误日志。
编辑: 我检查上面的代码上一个测试项目,这是我的看法控制器代码:
class ViewController: UIViewController {
@IBOutlet private weak var containerView: UIView!
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let leftSlider = UISlider()
let centerSlider = UISlider()
let rightSlider = UISlider()
let colorSliders = [leftSlider, centerSlider, rightSlider]
var constraints = [NSLayoutConstraint]()
for slider in colorSliders {
slider.translatesAutoresizingMaskIntoConstraints = false
containerView.addSubview(slider)
slider.transform = CGAffineTransform(rotationAngle: CGFloat(-M_PI_2))
constraints.append(slider.widthAnchor.constraint(equalTo: containerView.heightAnchor))
constraints.append(slider.centerYAnchor.constraint(equalTo: containerView.centerYAnchor))
slider.backgroundColor = .purple
}
constraints.append(leftSlider.centerXAnchor.constraint(equalTo: containerView.centerXAnchor))
constraints.append(centerSlider.centerXAnchor.constraint(equalTo: containerView.leadingAnchor))
constraints.append(rightSlider.centerXAnchor.constraint(equalTo: containerView.trailingAnchor))
NSLayoutConstraint.activate(constraints)
}
}
答
(如7月7日,2017)
self.customSlider = [[UISlider alloc] init]];
self.customView = [[UIView alloc] init];
//create the custom auto layout constraints that you wish the UIView to have
[self.view addSubview:self.customView];
[self.customView addSubview:self.customSlider];
self.slider.transform = CGAffineTransformMakeRotation(-M_PI_2);
/*Create the custom auto layout constraints for self.customSlider to have these 4 constraints:
//1. self.customSlider CenterX = CenterX of self.customView
//2. self.customSlider CenterY = CenterY of self.customView
//3. self.customSlider width = self.customView height
//4. self.customSlider height = self.customView width
*/
生病通过我的错误日志s,但上面提出的代码根本没有改进 – RubberDucky4444
我在一个空的项目中添加了一些示例代码,请再次检查我的答案! 我认为你添加了太多的约束,因为我不必使用添加额外约束的最后一行代码。 –
完美,谢谢 – RubberDucky4444