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UIImageView change depends on its state

By : Phuong
Date : August 01 2020, 10:00 AM
this one helps. First of all, instead of creating the imageView programatically, create it in the storyboard and use an @IBOutlet for it.
code :
@IBOutlet weak var imageView: UIImageView!
let enabledImage = UIImage(named: "enabled")
let disabledImage = UIImage(named: "disabled")
class VC: UIViewController {
    @IBOutlet weak var imageView: UIImageView!
    let enabledImage = UIImage(named: "enabled")
    let disabledImage = UIImage(named: "disabled")

    override func viewDidLoad() {
        imageView.image = enabledImage
        let gesture = UITapGestureRecognizer(target: self, action: #selector(imageViewTapped(_:)))
        imageView.isUserInteractionEnabled = true

    @objc func imageViewTapped(_ recognizer: UIGestureRecognizer) {
        imageView.image = (imageView.image == enabledImage) ? disabledImage : enabledImage

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How do I unit-test a class that depends on another class to change the state of something?

By : user2098104
Date : March 29 2020, 07:55 AM
this one helps. I figured out the best way to do this, while making sure that A's test doesn't depend on its implementation, would be to create a mock B that has a working get and set, but writes to a temporary variable.
Code example to test A:
code :
// Mock B
b = new function () {
    this.set = function (val) {
        this.v = val

    this.get = function () {
        return this.v

// Create an instance of A with Mock B
a = new A().init(b)

// Test A

// ...

Change the List itemRender depends of the view state

By : hatchi
Date : March 29 2020, 07:55 AM
Hope that helps Another option would be to create separate itemRenderers and use the itemRendererFunction.
I've taken this example from similar question that was asked earlier and modified it a bit to suit your needs:
code :
        import renderers.*;

        import mx.core.ClassFactory;
        import spark.skins.default.DefaultItemRenderer;

        private function list_itemRendererFunc(item:Object):ClassFactory {
            var cla:Class = MainItemRenderer;
            switch (currentState) {
                case "main":
                    cla = MainItemRenderer;
                    cla = CashCreditItemRenderer;
            return new ClassFactory(cla);

<s:List id="theList"
        x="69" y="82"
<s:List id="theList" 
        width="393" height="223" 
        x="42" y="69" 

Change UIImageView alpha state on tap

By : litzrsh
Date : March 29 2020, 07:55 AM
should help you out Wish to change UIimageview alpha with tap gesture, for example: , Yes.
Attach a tap gesture recognizer to the view:
code :
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(yourFunction:)];
[imageView addGestureRecognizer:tap];
if (imageView.alpha > 0.5f){
    imageView.alpha = 0.5f;
else {
    imageView.alpha = 1.0;

React render method that depends on asynchronous request and state change

By : maryesadiee
Date : March 29 2020, 07:55 AM
wish of those help Try to do it like the following, i.e.
Use componentWillReceiveProps to assign props.enableFeature to state.enableFeature. From documentation
code :
export class MyPage extends React.Component {
  static propTypes = {
    isFetching: React.PropTypes.bool,
    enableFeature: React.PropTypes.bool,
    token: React.PropTypes.string,
    actions: React.PropTypes.shape({
      fetchData: React.PropTypes.func

  state = {
    enableFeature: false,

  componentWillMount () {

  /* Assign received prop to state, so that this state can be used in render */
  componentWillReceiveProps(nextProps) {
    if (this.props.isFetching && !nextProps.isFetching) {
      this.state.enableFeature = nextProps.enableFeature;

  fetchData () {
    const { token } = this.props;

  handleEnableFeatureChange = (event) => {
    this.setState({ enableFeature: event.target.checked })

  render () {
    return (<div>
      { this.props.isFetching && "Loading..." }
        !this.props.isFetching && <label>
          Enable Feature

setState() does not change state when called from element that depends on state to render

By : user1458629
Date : March 29 2020, 07:55 AM
like below fixes the issue By writing onClick={this.setState({showStuff: false})} you are actually calling setState as soon as your button is rendered.
You want to give a function reference to onClick, not call it immediately on render.
code :
<button onClick={() => this.setState({showStuff: false})} />
  onClick={(event) => {
    this.setState({showStuff: false});
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