Ios 如何正确设置高度约束的动画
在我的应用程序中,我正在为视图的高度约束设置动画,当高度约束更改时,视图会向下平移一段时间,尽管我将约束设置为0。以下是我用来设置更改动画的代码:Ios 如何正确设置高度约束的动画,ios,swift,animation,constraints,Ios,Swift,Animation,Constraints,在我的应用程序中,我正在为视图的高度约束设置动画,当高度约束更改时,视图会向下平移一段时间,尽管我将约束设置为0。以下是我用来设置更改动画的代码: UIView.animate(withDuration: 0.5) { if finalHeight >= mediumY { self.heightConstraintConstant = self.maxHeight } else { self.heightConstraintConstant
UIView.animate(withDuration: 0.5) {
if finalHeight >= mediumY {
self.heightConstraintConstant = self.maxHeight
} else {
self.heightConstraintConstant = self.minHeight
}
}
以下是创建所有可展开视图的方法:
//
// ExpandibleView.swift
// PhotoMapping
//
// Created by Lorenzo Santini on 04/09/18.
// Copyright © 2018 Lorenzo Santini. All rights reserved.
//
import Foundation
import UIKit
class ExpandableView: UIView {
let panGestureRecognizer = UIPanGestureRecognizer()
var minHeight: CGFloat = 0 {
didSet {
initialHeight = minHeight
}
}
var maxHeight: CGFloat = 0
var initialHeight: CGFloat = 0
var initialPoint: CGPoint? = nil
var heightConstraintConstant: CGFloat {
get {
if !self.constraints.filter({ $0.firstAttribute == .height}).isEmpty {
return self.constraints.filter({$0.firstAttribute == .height && $0.secondItem == nil}).first!.constant
} else {
let constrain = NSLayoutConstraint(item: self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: initialHeight)
constrain.priority = .defaultHigh
self.addConstraint(constrain)
return constrain.constant
}
}
set(newConstant){
if !self.constraints.filter({ $0.firstAttribute == .height}).isEmpty {
self.constraints.filter({$0.firstAttribute == .height && $0.secondItem == nil}).first?.constant = newConstant
} else {
let constrain = NSLayoutConstraint(item: self, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: newConstant)
self.addConstraint(constrain)
}
//self.layoutIfNeeded()
}
}
func initialize(minHeight: CGFloat, maxHeight: CGFloat) {
//Create panGestureRecognizer
panGestureRecognizer.addTarget(self, action: #selector(handlePan(_:)))
panGestureRecognizer.minimumNumberOfTouches = 1
panGestureRecognizer.maximumNumberOfTouches = 1
self.addGestureRecognizer(panGestureRecognizer)
//Set min and max height
self.minHeight = minHeight
self.maxHeight = maxHeight
self.translatesAutoresizingMaskIntoConstraints = false
self.subviews.map{$0.translatesAutoresizingMaskIntoConstraints = false}
}
@objc func handlePan(_ sender: Any) {
let translation = panGestureRecognizer.translation(in: self)
if initialPoint == nil {
initialPoint = translation
}
let translationHeight = CGFloat(translation.y - initialPoint!.y)
let finalHeight = translationHeight + initialHeight
if panGestureRecognizer.state == .changed {
if finalHeight <= maxHeight && finalHeight >= minHeight {
heightConstraintConstant = finalHeight
} else if finalHeight >= maxHeight {
heightConstraintConstant = maxHeight
} else if finalHeight <= minHeight {
heightConstraintConstant = minHeight
}
} else if panGestureRecognizer.state == .ended {
let mediumY = maxHeight / 2 + minHeight / 2
if finalHeight >= mediumY {
self.heightConstraintConstant = self.maxHeight
} else {
self.heightConstraintConstant = self.minHeight
}
UIView.animate(withDuration: 0.5) {
self.layoutIfNeeded()
}
initialPoint = nil
initialHeight = heightConstraintConstant
}
//layoutIfNeeded()
}
}
//
//斯威夫特
//照相
//
//洛伦佐·桑蒂尼于2018年9月4日创作。
//版权所有©2018洛伦佐·桑蒂尼。版权所有。
//
进口基金会
导入UIKit
类ExpandableView:UIView{
设panGestureRecognizer=UIPanGestureRecognizer()
var minHeight:CGFloat=0{
迪塞特{
初始高度=最小高度
}
}
var maxHeight:CGFloat=0
变量initialHeight:CGFloat=0
变量初始点:CGPoint?=nil
var heightConstraintConstant:CGFloat{
得到{
if!self.constraints.filter({$0.firstAttribute==.height}).isEmpty{
返回self.constraints.filter({$0.firstAttribute=.height&&$0.secondItem==nil})。first!.constant
}否则{
let constraint=NSLayoutConstraint(项:self,属性:。高度,relatedBy:。相等,toItem:nil,属性:。高度,乘数:1.0,常数:initialHeight)
constraint.priority=.defaultHigh
self.addConstraint(约束)
返回常数
}
}
设置(新常量){
if!self.constraints.filter({$0.firstAttribute==.height}).isEmpty{
self.constraints.filter({$0.firstAttribute=.height&&$0.secondItem==nil})。first?.constant=newConstant
}否则{
let constraint=NSLayoutConstraint(项:self,属性:。高度,relatedBy:。相等,toItem:nil,属性:。高度,乘数:1.0,常数:newConstant)
self.addConstraint(约束)
}
//self.layoutifneed()
}
}
func初始化(最小高度:CGFloat,最大高度:CGFloat){
//创建搜索识别器
PangestureRecognitor.addTarget(self,action:#选择器(handlePan(:))
PangestureRecognitor.MinimumNumberOfTouchs=1
PangestureRecognitor.MaximumNumberOfTouchs=1
self.addgestureignizer(pangestureignizer)
//设置最小和最大高度
self.minHeight=最小高度
self.maxHeight=maxHeight
self.translatesAutoResizengMaskintoConstraints=false
self.subviews.map{$0.translatesAutoresizingMaskIntoConstraints=false}
}
@objc func手柄(uu发送方:任何){
let translation=pangestrerecognizer.translation(in:self)
如果initialPoint==nil{
初始点=翻译
}
让translationHeight=CGFloat(translation.y-initialPoint!.y)
让最终高度=平移高度+初始高度
如果panGestureRecognizer.state==.changed{
如果最终高度=最小高度{
heightConstraintConstant=最终高度
}否则,如果最终高度>=最大高度{
heightConstraintConstant=最大高度
}否则,如果最终重量=中等{
self.heightConstraintConstant=self.maxHeight
}否则{
self.heightConstraintConstant=self.minHeight
}
UIView.animate(持续时间:0.5){
self.layoutifneed()
}
初始点=零
初始高度=高度约束常数
}
//layoutIfNeeded()
}
}
对我来说,问题不在于如何设置高度变化的动画,因为这是可行的,而在于解决一个事实,即在一段时间内,应用程序似乎忽略了顶部的约束。
我相信您需要做的是为正在更新的布局设置动画。更具体地说是这样的
if finalHeight >= mediumY {
self.heightConstraintConstant = self.maxHeight
} else {
self.heightConstraintConstant = self.minHeight
}
UIView.animate(withDuration: 0.5) {
viewThatTheConstraintBelongsTo.layoutIfNeeded()
}
我相信你需要做的实际上是动画的布局正在更新。更具体地说是这样的
if finalHeight >= mediumY {
self.heightConstraintConstant = self.maxHeight
} else {
self.heightConstraintConstant = self.minHeight
}
UIView.animate(withDuration: 0.5) {
viewThatTheConstraintBelongsTo.layoutIfNeeded()
}
但这不是设置约束更改动画的方法。的可能重复。我从未做过类似的事情…我该怎么做?可能重复@RakeshaShastri我没有找到设置约束更改动画的解释,但这不是设置约束更改动画的方法。的可能重复。我从未做过类似的事情…我该怎么做do?可能的@RakeshaShastri副本我没有找到对约束更改设置动画的解释
视图,即约束项belongsto
将是超级视图视图,约束项belongsto
将是超级视图。