Display activity indicator inside UIButton(在 UIButton 内显示活动指示器)
本文介绍了在 UIButton 内显示活动指示器的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想在按下 UIButton 后将其内容更改为 ActivityIndicator.
I would like to change the content of a UIButton to an ActivityIndicator after it is pressed.
我知道按钮有一个 imageView 和一个 titleLabel,但我不知道如何在其中放置一个活动指示器.
I know buttons have an imageView and a titleLabel, but I don't know how to put an activity indicator in any of them.
这就是我创建活动指标的方式:
This is how I create activity indicators:
let aiView = UIActivityIndicatorView(activityIndicatorStyle: .Gray)
aiView.startAnimating()
aiView.center = CGPointMake(0,0)
aiView.hidesWhenStopped = false
推荐答案
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)
}
}
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