UIButton内部显示活动指示器
UIButton内部显示活动指示器
提问于 2016-04-11 04:02:07
在按下UIButton后，我想将它的内容更改为ActivityIndicator。
我知道按钮有一个imageView和一个titleLabel，但是我不知道如何在其中任何一个按钮中放置一个活动指示器。
我就是这样创建活动指标的：
let aiView = UIActivityIndicatorView(activityIndicatorStyle: .Gray)
aiView.startAnimating()
aiView.center = CGPointMake(0,0)
aiView.hidesWhenStopped = false回答 11
Stack Overflow用户
回答已采纳
发布于 2016-04-11 04:10:37
import UIKit
class LoadingButton: UIButton {
private var originalButtonText: String?
var activityIndicator: UIActivityIndicatorView!
func showLoading() {
originalButtonText = self.titleLabel?.text
self.setTitle("", for: .normal)
if (activityIndicator == nil) {
activityIndicator = createActivityIndicator()
}
showSpinning()
}
func hideLoading() {
self.setTitle(originalButtonText, for: .normal)
activityIndicator.stopAnimating()
}
private func createActivityIndicator() -> UIActivityIndicatorView {
let activityIndicator = UIActivityIndicatorView()
activityIndicator.hidesWhenStopped = true
activityIndicator.color = .lightGray
return activityIndicator
}
private func showSpinning() {
activityIndicator.translatesAutoresizingMaskIntoConstraints = false
self.addSubview(activityIndicator)
centerActivityIndicatorInButton()
activityIndicator.startAnimating()
}
private func centerActivityIndicatorInButton() {
let xCenterConstraint = NSLayoutConstraint(item: self, attribute: .centerX, relatedBy: .equal, toItem: activityIndicator, attribute: .centerX, multiplier: 1, constant: 0)
self.addConstraint(xCenterConstraint)
let yCenterConstraint = NSLayoutConstraint(item: self, attribute: .centerY, relatedBy: .equal, toItem: activityIndicator, attribute: .centerY, multiplier: 1, constant: 0)
self.addConstraint(yCenterConstraint)
}
}Stack Overflow用户
发布于 2016-11-04 20:50:26
鲍里斯:这个不应该扩展。
这是在快速3/4，改进代码:禁用按钮，工作与图像和标题。
class LoadingButton: UIButton {
struct ButtonState {
var state: UIControlState
var title: String?
var image: UIImage?
}
private (set) var buttonStates: [ButtonState] = []
private lazy var activityIndicator: UIActivityIndicatorView = {
let activityIndicator = UIActivityIndicatorView()
activityIndicator.hidesWhenStopped = true
activityIndicator.color = self.titleColor(for: .normal)
self.addSubview(activityIndicator)
activityIndicator.translatesAutoresizingMaskIntoConstraints = false
let xCenterConstraint = NSLayoutConstraint(item: self, attribute: .centerX, relatedBy: .equal, toItem: activityIndicator, attribute: .centerX, multiplier: 1, constant: 0)
let yCenterConstraint = NSLayoutConstraint(item: self, attribute: .centerY, relatedBy: .equal, toItem: activityIndicator, attribute: .centerY, multiplier: 1, constant: 0)
self.addConstraints([xCenterConstraint, yCenterConstraint])
return activityIndicator
}()
func showLoading() {
activityIndicator.startAnimating()
var buttonStates: [ButtonState] = []
for state in [UIControlState.disabled] {
let buttonState = ButtonState(state: state, title: title(for: state), image: image(for: state))
buttonStates.append(buttonState)
setTitle("", for: state)
setImage(UIImage(), for: state)
}
self.buttonStates = buttonStates
isEnabled = false
}
func hideLoading() {
activityIndicator.stopAnimating()
for buttonState in buttonStates {
setTitle(buttonState.title, for: buttonState.state)
setImage(buttonState.image, for: buttonState.state)
}
isEnabled = true
}
}Stack Overflow用户
发布于 2017-10-15 02:25:56
Swift 4.0稍加修改
class LoadingUIButton: UIButton {
@IBInspectable var indicatorColor : UIColor = .lightGray
var originalButtonText: String?
var activityIndicator: UIActivityIndicatorView!
func showLoading() {
originalButtonText = self.titleLabel?.text
self.setTitle("", for: .normal)
if (activityIndicator == nil) {
activityIndicator = createActivityIndicator()
}
showSpinning()
}
func hideLoading() {
DispatchQueue.main.async(execute: {
self.setTitle(self.originalButtonText, for: .normal)
self.activityIndicator.stopAnimating()
})
}
private func createActivityIndicator() -> UIActivityIndicatorView {
let activityIndicator = UIActivityIndicatorView()
activityIndicator.hidesWhenStopped = true
activityIndicator.color = indicatorColor
return activityIndicator
}
private func showSpinning() {
activityIndicator.translatesAutoresizingMaskIntoConstraints = false
self.addSubview(activityIndicator)
centerActivityIndicatorInButton()
activityIndicator.startAnimating()
}
private func centerActivityIndicatorInButton() {
let xCenterConstraint = NSLayoutConstraint(item: self, attribute: .centerX, relatedBy: .equal, toItem: activityIndicator, attribute: .centerX, multiplier: 1, constant: 0)
self.addConstraint(xCenterConstraint)
let yCenterConstraint = NSLayoutConstraint(item: self, attribute: .centerY, relatedBy: .equal, toItem: activityIndicator, attribute: .centerY, multiplier: 1, constant: 0)
self.addConstraint(yCenterConstraint)
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/36539650
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