Ios UIPangestureRecognitor不';t触发动作
我正在尝试创建UIView的一个子类,以便在视图上进行平移来扩展视图。它应该是这样工作的:如果用户使平移朝向顶部,则视图的高度会降低,而如果平移朝向底部,则视图的高度会增加。为了实现这一功能,我尝试向视图中添加一个UIPangestureRecognitor,但它似乎不起作用。我是这样做的: 第一个片段是uiView子类声明Ios UIPangestureRecognitor不';t触发动作,ios,swift,uiview,uipangesturerecognizer,Ios,Swift,Uiview,Uipangesturerecognizer,我正在尝试创建UIView的一个子类,以便在视图上进行平移来扩展视图。它应该是这样工作的:如果用户使平移朝向顶部,则视图的高度会降低,而如果平移朝向底部,则视图的高度会增加。为了实现这一功能,我尝试向视图中添加一个UIPangestureRecognitor,但它似乎不起作用。我是这样做的: 第一个片段是uiView子类声明 class ExpandibleView: UIView { //Here I create the reference to the recognizer
class ExpandibleView: UIView {
//Here I create the reference to the recognizer
let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
//And here I set its minimumNumberOfTouches and maximumNumberOfTouches properties and add it to the view
func initialize() {
panGestureRecognizer.minimumNumberOfTouches = 1
panGestureRecognizer.maximumNumberOfTouches = 1
self.addGestureRecognizer(panGestureRecognizer)
}
//here's the function that should handle the pan but who instead doesn't seem to been called at all
@objc func handlePan(_ sender:UIPanGestureRecognizer) {
//Here's I handle the Pan
}
}
第二个是视图控制器内部的实现
class MapViewController: UIViewController {
@IBOutlet weak var profileView: ExpandibleView!
//MARK: - ViewController Delegate Methods
override func viewDidLoad() {
super.viewDidLoad()
//Here I set the View
profileView.isUserInteractionEnabled = true
profileView.initialize()
profileView.minHeight = 100
profileView.maxHeight = 190
}
}
我在故事板内部将视图的类设置为我创建的子类,但识别器在所有处理程序中都不会触发。尝试更改此设置
class ExpandibleView: UIView {
func initialize() {
}
//here's the function that should handle the pan but who instead doesn't seem to been called at all
func handlePan() {
//your function
}
}
class MapViewController: UIViewController {
@IBOutlet weak var profileView: ExpandibleView!
//MARK: - ViewController Delegate Methods
override func viewDidLoad() {
super.viewDidLoad()
let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
panGestureRecognizer.minimumNumberOfTouches = 1
panGestureRecognizer.maximumNumberOfTouches = 1
profileView.addGestureRecognizer(panGestureRecognizer)
//Here I set the View
profileView.isUserInteractionEnabled = true
profileView.initialize()
profileView.minHeight = 100
profileView.maxHeight = 190
}
@objc func handlePan(_ sender:UIPanGestureRecognizer) {
profileView.handlePan()
}
}
也可以在其他视图中为调用创建委托
祝你好运 尝试更改此选项
class ExpandibleView: UIView {
func initialize() {
}
//here's the function that should handle the pan but who instead doesn't seem to been called at all
func handlePan() {
//your function
}
}
class MapViewController: UIViewController {
@IBOutlet weak var profileView: ExpandibleView!
//MARK: - ViewController Delegate Methods
override func viewDidLoad() {
super.viewDidLoad()
let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
panGestureRecognizer.minimumNumberOfTouches = 1
panGestureRecognizer.maximumNumberOfTouches = 1
profileView.addGestureRecognizer(panGestureRecognizer)
//Here I set the View
profileView.isUserInteractionEnabled = true
profileView.initialize()
profileView.minHeight = 100
profileView.maxHeight = 190
}
@objc func handlePan(_ sender:UIPanGestureRecognizer) {
profileView.handlePan()
}
}
也可以在其他视图中为调用创建委托
祝你好运 您遇到的问题是由于您在此处的类定义中定义了
pangestrerecognizer
变量:
//Here I create the reference to the recognizer
let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
您可以用这种方式初始化它,但在创建此变量时似乎没有设置self
。所以你的行为从未被注册过
有几种方法可以使用代码解决此问题,您可以继续将其初始化为实例变量,但需要在initialize()
函数中设置目标/操作
let panGestureRecognizer = UIPanGestureRecognizer()
func initialize() {
// add your target/action here
panGestureRecognizer.addTarget(self, action: #selector(handlePan(_:)))
panGestureRecognizer.minimumNumberOfTouches = 1
panGestureRecognizer.maximumNumberOfTouches = 1
addGestureRecognizer(panGestureRecognizer)
}
或者,您可以在initialize函数中简单地初始化手势识别器,而不使用实例变量
func initialize() {
let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
panGestureRecognizer.minimumNumberOfTouches = 1
panGestureRecognizer.maximumNumberOfTouches = 1
addGestureRecognizer(panGestureRecognizer)
}
我的原始答案
下面是一个解决方案,它使用在情节提要中定义的视图的约束或直接操纵帧
带有约束的示例
import UIKit
// Delegate protocol for managing constraint updates if needed
protocol MorphDelegate: class {
// tells the delegate to change its size constraints
func morph(x: CGFloat, y: CGFloat)
}
class ExpandableView: UIView {
var delegate: MorphDelegate?
init() {
// frame is set later if needed by creator when using this init method
super.init(frame: CGRect.zero)
configureGestureRecognizers()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
configureGestureRecognizers()
}
override init(frame: CGRect) {
super.init(frame: frame)
configureGestureRecognizers()
}
// setup UIPanGestureRecognizer
internal func configureGestureRecognizers() {
let panGR = UIPanGestureRecognizer.init(target: self, action: #selector(didPan(_:)))
addGestureRecognizer(panGR)
}
@objc func didPan(_ panGR: UIPanGestureRecognizer) {
// get the translation
let translation = panGR.translation(in: self).applying(transform)
if let delegate = delegate {
// tell delegate to change the constraints using this translation
delegate.morph(x: translation.x, y: translation.y)
} else {
// If you want the view to expand/contract in opposite direction
// of drag then swap the + and - in the 2 lines below
let newOriginY = frame.origin.y + translation.y
let newHeight = frame.size.height - translation.y
// expand self via frame manipulation
let newFrame = CGRect(x: frame.origin.x, y: newOriginY, width: frame.size.width, height: newHeight)
frame = newFrame
}
// reset translation
panGR.setTranslation(CGPoint.zero, in: self)
}
}
如果您想通过在故事板中定义类并操纵它的约束来使用它,您可以这样做
首先在故事板中定义视图,并约束其宽度和高度。对于演示,我将其x位置约束到视图中心,底部约束到SafeArea.bottom
为视图创建IBOutlet,以及视图控制器文件的高度约束
在本例中,我将背景颜色设置为蓝色
在视图控制器中,我定义了一个函数来设置视图(当前仅设置约束操纵回调的委托),然后定义了一个扩展来处理更新约束的委托调用
class ViewController: UIViewController {
@IBOutlet weak var expandingView: ExpandableView!
@IBOutlet weak var constraint_expViewHeight: NSLayoutConstraint!
override func viewDidLoad() {
super.viewDidLoad()
// call to configure our expanding view
configureExpandingView()
}
// this sets the delegate for an expanding view defined in the storyboard
func configureExpandingView() {
expandingView.delegate = self
}
}
// setup the delegate callback to handle constraint manipulation
extension ViewController: MorphDelegate {
func morph(x: CGFloat, y: CGFloat) {
// this will update the view's height based on the amount
// you drag your finger in the view. You can '+=' below if
// you want to reverse the expanding behavior based on pan
// movements.
constraint_expViewHeight.constant -= y
}
}
当我运行项目时,通过约束以这种方式执行此操作会产生以下效果:
帧操作示例
要使用此属性并仅使用“框架”属性操纵高度,视图控制器可能会实现视图创建,如下所示:
override func viewDidLoad() {
super.viewDidLoad()
setupExpandingView()
}
func setupExpandingView() {
let newView = ExpandableView()
newView.backgroundColor = .red
newView.frame = CGRect(x: 20, y: 200, width: 100, height: 100)
view.addSubview(newView)
}
仅使用帧操纵,我得到以下结果:
您遇到的问题是由于您在此处的类定义中定义了
pangestrerecognizer
变量:
//Here I create the reference to the recognizer
let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
您可以用这种方式初始化它,但在创建此变量时似乎没有设置self
。所以你的行为从未被注册过
有几种方法可以使用代码解决此问题,您可以继续将其初始化为实例变量,但需要在initialize()
函数中设置目标/操作
let panGestureRecognizer = UIPanGestureRecognizer()
func initialize() {
// add your target/action here
panGestureRecognizer.addTarget(self, action: #selector(handlePan(_:)))
panGestureRecognizer.minimumNumberOfTouches = 1
panGestureRecognizer.maximumNumberOfTouches = 1
addGestureRecognizer(panGestureRecognizer)
}
或者,您可以在initialize函数中简单地初始化手势识别器,而不使用实例变量
func initialize() {
let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
panGestureRecognizer.minimumNumberOfTouches = 1
panGestureRecognizer.maximumNumberOfTouches = 1
addGestureRecognizer(panGestureRecognizer)
}
我的原始答案
下面是一个解决方案,它使用在情节提要中定义的视图的约束或直接操纵帧
带有约束的示例
import UIKit
// Delegate protocol for managing constraint updates if needed
protocol MorphDelegate: class {
// tells the delegate to change its size constraints
func morph(x: CGFloat, y: CGFloat)
}
class ExpandableView: UIView {
var delegate: MorphDelegate?
init() {
// frame is set later if needed by creator when using this init method
super.init(frame: CGRect.zero)
configureGestureRecognizers()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
configureGestureRecognizers()
}
override init(frame: CGRect) {
super.init(frame: frame)
configureGestureRecognizers()
}
// setup UIPanGestureRecognizer
internal func configureGestureRecognizers() {
let panGR = UIPanGestureRecognizer.init(target: self, action: #selector(didPan(_:)))
addGestureRecognizer(panGR)
}
@objc func didPan(_ panGR: UIPanGestureRecognizer) {
// get the translation
let translation = panGR.translation(in: self).applying(transform)
if let delegate = delegate {
// tell delegate to change the constraints using this translation
delegate.morph(x: translation.x, y: translation.y)
} else {
// If you want the view to expand/contract in opposite direction
// of drag then swap the + and - in the 2 lines below
let newOriginY = frame.origin.y + translation.y
let newHeight = frame.size.height - translation.y
// expand self via frame manipulation
let newFrame = CGRect(x: frame.origin.x, y: newOriginY, width: frame.size.width, height: newHeight)
frame = newFrame
}
// reset translation
panGR.setTranslation(CGPoint.zero, in: self)
}
}
如果您想通过在故事板中定义类并操纵它的约束来使用它,您可以这样做
首先在故事板中定义视图,并约束其宽度和高度。对于演示,我将其x位置约束到视图中心,底部约束到SafeArea.bottom
为视图创建IBOutlet,以及视图控制器文件的高度约束
在本例中,我将背景颜色设置为蓝色
在视图控制器中,我定义了一个函数来设置视图(当前仅设置约束操纵回调的委托),然后定义了一个扩展来处理更新约束的委托调用
class ViewController: UIViewController {
@IBOutlet weak var expandingView: ExpandableView!
@IBOutlet weak var constraint_expViewHeight: NSLayoutConstraint!
override func viewDidLoad() {
super.viewDidLoad()
// call to configure our expanding view
configureExpandingView()
}
// this sets the delegate for an expanding view defined in the storyboard
func configureExpandingView() {
expandingView.delegate = self
}
}
// setup the delegate callback to handle constraint manipulation
extension ViewController: MorphDelegate {
func morph(x: CGFloat, y: CGFloat) {
// this will update the view's height based on the amount
// you drag your finger in the view. You can '+=' below if
// you want to reverse the expanding behavior based on pan
// movements.
constraint_expViewHeight.constant -= y
}
}
当我运行项目时,通过约束以这种方式执行此操作会产生以下效果:
帧操作示例
要使用此属性并仅使用“框架”属性操纵高度,视图控制器可能会实现视图创建,如下所示:
override func viewDidLoad() {
super.viewDidLoad()
setupExpandingView()
}
func setupExpandingView() {
let newView = ExpandableView()
newView.backgroundColor = .red
newView.frame = CGRect(x: 20, y: 200, width: 100, height: 100)
view.addSubview(newView)
}
仅使用帧操纵,我得到以下结果:
更改参数类型无效。“在其他视图中为调用创建委托”是什么意思?它一直不起作用..我真的不明白错在哪里更改参数类型不起作用。“在其他视图中为调用创建代理”是什么意思?它一直不起作用..我真的不明白这是怎么回事..非常感谢..另一件事。。为了展开视图,我正在更改高度约束的高度,但当我这样做时,视图不会展开。我不确定“我正在更改高度约束高度”是什么意思。。。是否正在更改高度约束
.constant
属性?另外,如果您正在使用演示的委派设置,是否正在设置展开视图的委派属性以确保在视图控制器中调用回调?这很有效..非常感谢..另一件事。。为了展开视图,我正在更改高度约束的高度,但当我这样做时,视图不会展开。我不确定“我正在更改高度约束高度”是什么意思。。。是否正在更改高度约束.constant
属性?此外,如果您正在使用演示的委派设置,是否正在设置展开视图的de