我有一个包含三个文本字段/文本视图字段的视图，为了在键盘出现时使视图可滚动，我将所有元素都放在了滚动视图中。之前不在框架之外的元素，所以 contentSize 应该与全屏大小相同，然后当键盘出现时，所以当键盘出现时，我将滚动视图的底部约束更新为视图底部的 -keyboardHeight然后它可以在键盘上方滚动..
这一切都很好，问题是在滚动视图的底部添加一个按钮，该按钮引导/拖尾到视图的侧面和底部。
看图片：
我希望按钮在哪里。到 right.left.bottom 大约 20 个边距
我正在使用 SnapKit 来设置我的约束，对于按钮我想做这样的事情：
sharebutton.snp.makeConstraints { (make) in
make.width.left.right.equalToSuperview()
make.bottom.equalToSuperview().offset(-20)
}
（Superview/scrollview 已经设置为 20 边距）
//编辑：添加代码->
override func viewDidLayoutSubviews() {
scrollview.contentSize = CGSize(width: centerView.frame.width, height: view.frame.height)
}
override func viewDidLoad() {
super.viewDidLoad()
self.title = "title"
view.backgroundColor = .white
view.addSubview(scrollview)
scrollview.addSubview(sharebutton)
scrollview.addSubview(subjectField)
scrollview.addSubview(messageField)
scrollview.addSubview(datepicker)
scrollview.addSubview(addressTable)
addressTable.dataSource = self
addressTable.delegate = self
addressTable.separatorStyle = .none
addressTable.keyboardDismissMode = .onDrag
addressTable.separatorStyle = .singleLineEtched
subjectField.placeholder = "content"
datepicker.setTitle("topbutton", for: .normal)
datepicker.setTitleColor(.black, for: .normal)
datepicker.setTitleColor(UIColor.ME.border, for: .highlighted)
datepicker.titleLabel?.font = UIFont.ME.button
datepicker.layer.borderWidth = 1
datepicker.layer.cornerRadius = 3
datepicker.layer.borderColor = UIColor.ME.border.cgColor
datepicker.addTarget(self, action: #selector(showDates), for: .touchUpInside)
sharebutton.setTitle("Share", for: .normal)
sharebutton.backgroundColor = UIColor.ME.buttonMainBlue
sharebutton.addTarget(self, action: #selector(shareClicked), for: .touchUpInside)
scrollview.backgroundColor = .red
scrollview.snp.makeConstraints { (make) in
make.top.bottom.equalToSuperview()
make.left.width.right.equalTo(centerView)
}
datepicker.snp.makeConstraints { (make) in
make.top.equalToSuperview().offset(paddingGlobal)
make.left.width.right.equalToSuperview()
make.height.equalTo(50)
}
addressTable.snp.makeConstraints { (make) in
make.top.equalTo(datepicker.snp.bottom)
make.left.right.equalTo(datepicker)
make.height.equalTo(200)
}
subjectField.snp.makeConstraints { (make) in
make.top.equalTo(datepicker.snp.bottom).offset(20)
make.left.right.equalToSuperview()
}
messageField.snp.makeConstraints { (make) in
make.top.equalTo(subjectField.snp.bottom).offset(20)
make.height.equalTo(200)
make.left.right.equalToSuperview()
}
sharebutton.snp.makeConstraints { (make) in
make.width.left.right.equalToSuperview()
make.bottom.equalToSuperview().offset(-20)
}
}
有什么想法吗 ？
