Swift ImagePicker在AutoLayout约束上引发SIGNAL SIGABRT

时间:2019-06-12 19:32:20

标签: swift xcode uiimageview uiimagepickercontroller

我正在Swift5中建立一个项目,我需要用户上传照片。我将其设置为用户可以打开ImagePicker并选择照片的地步,但是每当他们选择图像并返回到原始VC时,我都会收到SIGNAL SIGABRT错误(在帖子底部):

这是我以编程方式添加约束的地方:

func setupLayout(){
    imgView.topAnchor.constraint(equalTo: view.topAnchor, constant: 150).isActive = true
    imgView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    imgView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
    imgView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
    imgView.heightAnchor.constraint(equalToConstant: 125).isActive = true

    topLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    topLabel.topAnchor.constraint(equalTo: imgView.bottomAnchor, constant: 60).isActive = true
    topLabel.widthAnchor.constraint(equalTo: view.widthAnchor, constant: -50).isActive = true
    topLabel.heightAnchor.constraint(equalToConstant: 50).isActive = true
    topLabel.adjustsFontSizeToFitWidth = true

    inputBox.topAnchor.constraint(equalTo: topLabel.bottomAnchor, constant: 30).isActive = true
    inputBox.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    inputBox.heightAnchor.constraint(equalToConstant: 50).isActive = true
    inputBox.widthAnchor.constraint(equalToConstant: 250).isActive = true

    btn.topAnchor.constraint(equalTo: inputBox.bottomAnchor, constant: 40).isActive = true
    btn.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true

    let navBarImageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 10, height: 10))
    navBarImageView.contentMode = .scaleAspectFit
    let navBarImage = UIImage(named: "bzaLogo")
    navBarImageView.image = navBarImage
    self.navigationController?.navigationItem.titleView = navBarImageView
}

我将图像放回imageView的位置:

func didSelect(image: UIImage?) {
    self.imgView.image = image
    self.global.uploadFile(imageView: self.uploadIcon.imageView!)
}

在其中添加子视图的位置:

override func viewDidLoad() {
    super.viewDidLoad()
    currentState = 0
    imgView.translatesAutoresizingMaskIntoConstraints = false
    topLabel.translatesAutoresizingMaskIntoConstraints = false
    inputBox.translatesAutoresizingMaskIntoConstraints = false
    btn.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(imgView)
    view.addSubview(topLabel)
    view.addSubview(inputBox)
    view.addSubview(btn)

    inputBox.addTarget(self, action: #selector(inputBoxClicked(textField:)), for: .touchDown)
    imagePicker = ImagePicker(presentationController: self, delegate: self)
    viewModel.state = currentState
    inputBox.delegate = self

    setupLayout()
}

这是引发错误的地方:

2019-06-12 13:22:16.635903-0600 bZa [39792:1836482] ***由于未捕获的异常'NSGenericException'终止了应用程序,原因:'无法激活锚点约束,因为它们没有共同祖先。约束或其锚点是否引用了不同视图层次结构中的项目?那是非法的。'

1 个答案:

答案 0 :(得分:0)

当前的问题是,您在没有评论祖先的视图之间添加了约束,因此请确认您添加了

view.addSubview(imgView)  
view.addSubview(topLabel) 
view.addSubview(inputBox)
view.addSubview(btn)

也不要忘记

imgView.translatesAutoresizingMaskIntoConstraints = false 
topLabel.translatesAutoresizingMaskIntoConstraints = false
inputBox.translatesAutoresizingMaskIntoConstraints = false
btn.translatesAutoresizingMaskIntoConstraints = false