我面临一个难以理解的问题。
我有一个登录UIViewController和一个ProgressLoading UIVisualEffectView。我想在进行API调用并等待响应时打印加载。这是myProgressLoading类
import UIKit
class ProgressLoading: UIVisualEffectView {
var text: String? {
didSet {
label.text = text
}
}
let activityIndictor: UIActivityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.gray)
let label: UILabel = UILabel()
let blurEffect = UIBlurEffect(style: .light)
let vibrancyView: UIVisualEffectView
init(text: String) {
self.text = text
self.vibrancyView = UIVisualEffectView(effect: UIVibrancyEffect(blurEffect: blurEffect))
self.vibrancyView.backgroundColor = UIColor(white: 0.2, alpha: 0.7)
super.init(effect: blurEffect)
self.setup()
}
required init?(coder aDecoder: NSCoder) {
self.text = ""
self.vibrancyView = UIVisualEffectView(effect: UIVibrancyEffect(blurEffect: blurEffect))
self.vibrancyView.backgroundColor = UIColor(white: 0.2, alpha: 0.7)
super.init(coder: aDecoder)
self.setup()
}
func setup() {
contentView.addSubview(vibrancyView)
contentView.addSubview(activityIndictor)
contentView.addSubview(label)
activityIndictor.startAnimating()
}
override func didMoveToSuperview() {
super.didMoveToSuperview()
if let superview = self.superview {
let width = superview.frame.size.width / 2.3
let height: CGFloat = 50.0
self.frame = CGRect(x: superview.frame.size.width / 2 - width / 2,
y: superview.frame.height / 2 - height / 2,
width: width,
height: height)
vibrancyView.frame = self.bounds
let activityIndicatorSize: CGFloat = 40
activityIndictor.frame = CGRect(x: 5,
y: height / 2 - activityIndicatorSize / 2,
width: activityIndicatorSize,
height: activityIndicatorSize)
activityIndictor.color = UIColor.white
layer.cornerRadius = 8.0
layer.masksToBounds = true
label.text = text
label.textAlignment = NSTextAlignment.center
label.frame = CGRect(x: activityIndicatorSize + 5,
y: 0,
width: width - activityIndicatorSize - 15,
height: height)
label.textColor = UIColor.white
label.font = UIFont.boldSystemFont(ofSize: 16)
}
}
func show() {
self.isHidden = false
}
func hide() {
self.isHidden = true
}
}
以下是我如何使用我的进度加载,显示和隐藏方法并使用文本声明。
override func viewDidLoad() {
super.viewDidLoad()
progressLoading = ProgressLoading(text: "Loggin in...")
progressLoading?.hide()
self.view.addSubview(progressLoading!)
}
func startAnimatingLoading(viewModel: Login.ViewModel) {
self.progressLoading?.show()
}
func stopAnimatingLoading(viewModel: Login.ViewModel) {
self.progressLoading?.hide()
}
我的问题是,当我等待响应时,我以编程方式显示加载,但我的设备中没有任何内容。 (如果你想知道,我通过创建断点并保持断点来模拟长API回调)
我查看了视图层次结构,并且正在加载就在我所要求的所有内容之前。
这是我的视图层次结构:
是否有一些我没有得到viewHierarchy?如何在视图层次结构上显示某些内容但不在我的设备中显示?
谢谢你的帮助,我只是不明白!
你是在主线程上进行API调用吗?如果启动动画然后阻止主线程,则不会出现进度指示器 - 系统至少需要一个绘制周期才能实际显示指示器。将模拟的API调用移动到后台线程,然后在调用之前显示指示符,并在API响应时隐藏它。希望这可以帮助!