我正在做一个项目,我向UIView添加了多个UITextFields,它充当容器视图。 然后,我将此容器视图添加到 UIScrollView,进而将其添加到屏幕的主视图中。 问题是,我的容器视图出现在屏幕上,但没有滚动,尽管附加到 UIScrollView,我说不出原因。 所有代码和约束都在 Swift 中。
以下是我到目前为止的相关代码:
private func setupViews() {
view.backgroundColor = .nzRedColor()
registerView.frame = CGRect(x: 0.0, y: 0.0, width: self.view.frame.width, height: self.view.frame.height)
registerView.backgroundColor = UIColor.green
registerScrollView.frame = CGRect(x: 0.0, y: 0.0, width: self.view.frame.width, height: 300.0)
registerScrollView.backgroundColor = UIColor.blue
let addViewsClosure = { (superview: UIView, views: UIView...)->() in
for view in views {
view.translatesAutoresizingMaskIntoConstraints = false
if ((view as? UIImageView) != nil) {
superview.addSubview(view)
} else if ((view as? UITextField) != nil) {
self.registerView.addSubview(view)
self.registerScrollView.addSubview(self.registerView)
superview.addSubview(self.registerScrollView)
} else {
superview.addSubview(view)
}
}
}
let customizeTextFields = { (textfields: UITextField...) in
for textfield in textfields {
textfield.backgroundColor = UIColor(white: 1.0, alpha: 0.3)
textfield.font = UIFont.systemFont(ofSize: 14, weight: UIFontWeightRegular)
textfield.layer.cornerRadius = 2.0
}
}
customizeTextFields(firstNameTextField, lastNameTextField, cityTextField, countryTextField, emailTextField, passwordTextField, passwordConfirmationTextField)
addViewsClosure(view, logoImageView, firstNameTextField, lastNameTextField, cityTextField, countryTextField, emailTextField, passwordTextField, passwordConfirmationTextField, registerButton, skipButton)
logoImageView.constrainTop(at: 50, after: topLayoutGuide.anchorableRepresentation)
logoImageView.constrainCenterHorizontally()
logoImageWidthConstraint = logoImageView.constrainWidth(at: 0)
logoImageHeightConstraint = logoImageView.constrainHeight(at: 0)
updateLogoImageSize()
firstNameTextField.constrainTop(at: 10, after: logoImageView)
firstNameTextField.constrainHeight(at: 50)
firstNameTextField.constrainLeading(alignedWith: view, offset: 10)
firstNameTextField.constrainTrailing(alignedWith: view, offset: -10)
lastNameTextField.constrainTop(at: 10, after: firstNameTextField)
lastNameTextField.constrainHeight(at: 50)
lastNameTextField.constrainLeading(alignedWith: firstNameTextField)
lastNameTextField.constrainTrailing(alignedWith: firstNameTextField)
cityTextField.constrainTop(at: 10, after: lastNameTextField)
cityTextField.constrainHeight(at: 50)
cityTextField.constrainLeading(alignedWith: firstNameTextField)
cityTextField.constrainTrailing(alignedWith: firstNameTextField)
countryTextField.constrainTop(at: 10, after: cityTextField)
countryTextField.constrainHeight(at: 50)
countryTextField.constrainLeading(alignedWith: firstNameTextField)
countryTextField.constrainTrailing(alignedWith: firstNameTextField)
emailTextField.constrainTop(at: 10, after: countryTextField)
emailTextField.constrainHeight(at: 50)
emailTextField.constrainLeading(alignedWith: firstNameTextField)
emailTextField.constrainTrailing(alignedWith: firstNameTextField)
passwordTextField.constrainTop(at: 10, after: emailTextField)
passwordTextField.constrainHeight(at: 50)
passwordTextField.constrainLeading(alignedWith: firstNameTextField)
passwordTextField.constrainTrailing(alignedWith: firstNameTextField)
passwordConfirmationTextField.constrainTop(at: 10, after: passwordTextField)
passwordConfirmationTextField.constrainHeight(at: 50)
passwordConfirmationTextField.constrainLeading(alignedWith: firstNameTextField)
passwordConfirmationTextField.constrainTrailing(alignedWith: firstNameTextField)
registerView.constrainTop(at: 0)
registerView.constrainHeight(at: self.view.frame.height)
registerView.constrainLeading(at: 0)
registerView.constrainTrailing(at: 0)
registerScrollView.constrainTop(at: 50, after: logoImageView)
registerScrollView.constrainHeight(at: 300.0)
registerScrollView.constrainLeading(at: 0)
registerScrollView.constrainTrailing(at: 0)
registerButton.constrainTop(at: 30, after: passwordConfirmationTextField)
registerButton.constrainHeight(at: 50)
registerButton.constrainLeading(alignedWith: firstNameTextField)
registerButton.constrainTrailing(alignedWith: firstNameTextField)
skipButton <- { $0.top >= registerButton.anchors.bottom + 12 }
skipButton.constrainBottom(at: 12)
skipButton.constrainCenterHorizontally()
}
我想在这里注意两件事:
尽管我将注册视图的背景颜色设置为"绿色",但我没有显示视图。
出于某种原因,所有UITextFields都直接出现在UIScrollView上(因为它的颜色是蓝色的(,并且UIScrollView是可见的,但不幸的是不可滚动。我做错了什么?
将自动布局与滚动视图一起使用时,滚动视图的内容定义了.contentSize
。这意味着您的registerView
必须正确设置其所有约束。
您将registerView
背景设置为绿色,但看不到视图?我敢打赌,如果您将其.clipsToBounds
设置为 true
您也不会再看到文本字段。
registerView.constrainTop(at: 0)
registerView.constrainHeight(at: self.view.frame.height)
registerView.constrainLeading(at: 0)
registerView.constrainTrailing(at: 0)
您已经设置了"顶部"、"行距"、"尾随"和"高度"约束,但看起来缺少"宽度"和"底部"。
底部约束可能应该设置为 0
- 如顶部、前导和尾随。
我猜您希望registerView
高度约束由最后一个文本字段(passwordConfirmationTextField
(确定,但如果是这种情况,您仍然缺少那个。