We have a iPad app which includes a two-column news reader. The left view contains the list of news of which some link directly to a news and some push another view controller with another list of news. This will also cause a UIButton to be set as the leftBarButtonItem of the navigation bar. If we are on first level, a simple image that cannot be tapped will be the leftBarButtonItem.
My goal is now to have a test that taps every news on the first level. If a news leads to a second level list, it should tap the UIButton in the navigation bar.
How can I check, if the leftBarButtonItem is "tappable"? Since it can be either an image or a button, just calling navigationBar().leftButton().tap() will lead to an error if it's an image.
I'm also using the tuneup library if that's any help.
Almost all elements in UIAutomation could be tapped. It does not matter if it is an Image, View or a Button. You will get an error in case an object you are trying to tap is invalid.
How to check:
if ( navigationBar().leftButton().checkIsValid() )
{
navigationBar().leftButton().tap();
}
else
{
//do what you need.
}
or you can check if an object you are trying to tap is a button, for example (not the best way but it works):
if ( navigationBar().leftButton().toString() == "[object UIAButton]" )
{
navigationBar().leftButton().tap();
}
else
{
//do what you need.
}
checkIsValid() is available for all UI elements. It will return true if an object exists.
toString() will return [object UIAElementNil] if element is invalid or will return [object UIAButton] or [object UIAImage].
Also try to use Apple documentation:
http://developer.apple.com/library/ios/#documentation/ToolsLanguages/Reference/UIAElementClassReference/UIAElement/UIAElement.html
You can simply use
if (navigationBar().leftButton().exists)
{
navigationBar().leftButton().tap();
}
else
{
//do what you need.
}
Related
I'm building an app which which has built in with 2 different tabs. First tab is is "Home" which basically has a tableview with cells that configured from an api.(The api gets me country names for now)
Those cells also have a "Star" button which prints the data of the specific cell for now.
Second tab is "Saved" tab(SavedViewController), where I want to show the "starred" countries, using a tableview.
You can see the image below in order to get an idea for the app.
App simulation Image
The star button has a function in my CountriesTableViewCell. I'm using a saveButtonDelegate in order to let the SavedViewController know about an item is going to be saved. The code in CountriesTableViewCell for star button is as below.
#objc func buttonTapped() {
//If Button is selected fill the image. Else unfill it.
if !isSaveButtonSelected {
saveButton.setImage(UIImage(systemName: "star.fill"), for: .normal)
isSaveButtonSelected = true
saveButtonDelegate?.saveButtonClicked(with: countryData) //Checking if save button is clicked
}
}
countryData is the data that I get from the api, and this is the data I want to pass to SavedViewController.
struct CountryData: Codable {
let name : String
}
So on the SavedViewController, I'm handling the data using the SaveButtonProtocol conformance as below:
extension SavedViewController: SaveButtonProtocol {
func saveButtonClicked(with data: CountryData) {
countryDataArray.append(data)
print("saveButtonClicked")
print("countryData in savevc is \(countryDataArray)")
DispatchQueue.main.async {
self.countriesTableView.reloadData()
}
}
}
Whenever I click the star button on the first tab, this function is getting called on SavedViewController. So whenever I click to button, those print statements above work fine.
The problem is, whenever the star button is clicked, it should append the data of the current clicked cell to countryDataArray in SavedViewController. But the array is not populating as it should.
Let's say I pressed the first cell's star button, my print("countryData in savevc is (countryDataArray)") statement prints : ["Vatican City"], then I press the second cell's star button it only prints ["Ethiopia"] while it should print ["Vatican City", "Ethiopia"]
Why this issue is happening? My best guess is I'm delegating SavedViewController from the cell class so it behaves differently for every other cell. If that is the problem what should I do to solve it?
Many Thanks.
You should store your data in a shared (static array) object so you only have one source and add the saved indicator in your country struct so you do not rely on what is displayed in one view controller.
In the settings section of my app the user has the option to change the language of the app. So when the user chooses spanish as his primary language the app show the content in spanish after he did an app restart but I want to change the language on the fly. This works for the main content like a TableView because I simply can reload the data but the language in my TabBarController does not change because I don't know how.
So I want to update (or better call it a reset) the TabBarController. After the reset it should display all navigation points in the new language.
My idea was to remove the current TabBarController and initialize a new one. Is this possible? Or is there a better way?
I am not an native english speaker so if my explanations aren't clear enough, just tell me and I'll try to rephrase them.
It might look scary and complicated because of my long post, But it really isn't, it is just long because I thought it would be better to also explain how to do it, instead of just giving a few lines of code.
You can achieve what you want using UITabBarController properties.
UITabBarController have a property called tabBar, which is the actual UITabBar.
One might think that in order to achieve what you want, you should edit this property,
HOWEVER, editing this property would cause an exception.
From apple's UITabBarController documentations, regarding the tabBar property:
You should never attempt to manipulate the UITabBar object itself stored in
this property. If you attempt to do so, the tab bar view throws an exception.
So you should never attempt to edit this property at runtime.
After that word of warning, here is what you should do-
UITabBarController also have a property called viewControllers, which is an NSArray who holds reference to the view controllers that being displayed by the tab bar.
This property CAN be modified at runtime, and changes applied to it are updated instantly in the tab bar.
However, for your case, you don't need to modify this property,
But I thought you should know that so if in some situation you will need to add or remove some items from your tab bar, you'll know that can do it.
What you do want to do, is iterate through the objects of that array to access the view controllers themselves.
UIViewController have a property called tabBarItem which represents the UITabBarItem of the view controller.
So what we are basically doing, is getting the tab bar item of the view controller, but instead of getting it from the UITabBarController itself, we are getting it directly from each view controller.
Each UITabBarItem has a title property, and this is what you want to change.
So now, after that long introduction, let's get to the actual code.
I think a pretty easy way to achieve what you want is to iterate thru the viewControllers array, and have some switch statement in there that would change the title.
As in any programming situations, this can be done in countless other ways, so you might have a better way to implement it than my example below, but this should do the trick.
Each view controller that being displayed in a tab bar controller, have a reference to that tab bar using the property tabBarController
So you can run this code in any of the view controllers that being displayed in the tab bar, and simply use self.reference to get a reference to it.
Add this somewhere after the language have changed-
for (int i = 0; i < [self.tabBarController.viewControllers count]; i++) {
if([self.tabBarController.viewControllers[i] isKindOfClass: [UIViewController class]]) {
UIViewController *vc = self.tabBarController.viewControllers[i];
switch(i) {
case 0:
vc.tabBarItem.title = #"primero";
break;
case 1:
vc.tabBarItem.title = #"secondo";
break;
}
}
}
What we are basically doing, is running a for loop that iterating thru all of the items in the array,
The items in the array are in the same order that they appear on the tab bar,
then we use a switch statement to change the title for the view controller in the corresponding position,
Since array have index 0, the first view controller is at position i=0 and the last one is at one less than the count of items in the array.
Some might argue that my if is unnecessary,
Since we already know that this array holds only view controllers, there is no need to check if the item at that position is of UIViewController class, or a subclass of it.
They might be right, but I always say it's better to be safe than sorry.
Of Curse I would also include in your code something to actually check to what language the user have chosen.
The example above changes the titles to spanish, regardless of the user's choice.
Hope it helps mate,
Good luck
#AMI289 gave a good idea.
Make an extension for UITabBarController and do a loop there. Can call anywhere from the tabBarControllers stack.
In my case after the tabBarController goes navigationController.
// MARK: - UITabBarController
extension UITabBarController {
func changeTitleLocale() {
guard let viewContollers = self.viewControllers else { return }
for (index, navVC) in viewContollers.enumerated() {
if let view = navVC as? UINavigationController {
if let topView = view.topViewController {
if topView.isKind(of: ProfileVC.self) {
self.tabBar.items?[index].title = "tab_profile"
} else if topView.isKind(of: ChatVC.self) {
self.tabBar.items?[index].title = "tab_chat"
} else if topView.isKind(of: PicturesVC.self) {
self.tabBar.items?[index].title = "tab_pictures"
} else if topView.isKind(of: VideosVC.self) {
self.tabBar.items?[index].title = "tab_videos"
}
}
}
}
}
}
Then, when we change a language just run it:
self.tabBarController?.changeTitleLocale()
I seem to be missing something very simple here.
I have a UIViewController which contains a UISegmentControl with two segments ("shown" & "not shown").
The user selects one in this view controller and fills in some information into text fields which all gets saved to a table view controller.
When I click on a cell to edit the information, I can't get the selected segment to show, so if I select "Not shown" in this cell when saving, I want it to show "Not Shown" selected when I edit the cell.
I then of course want to provide the user the ability to change from "Not Shown" to "Shown" with the UISegmentControl.
My code for saving the UISegment Control in the save method of the creating View Controller is:
contract.wasShown = #(self.isShownSegment.selectedSegmentIndex == 0);
I'm using Core Data here.
So in the detailViewController, I have tried a few things but with no luck (it's always showing the first segment).
if ([contract.wasShown boolValue]) {
contract.wasShown = #(self.isShownSegment.selectedSegmentIndex == 0);
}
else {
contract.wasShown = #(self.isShownSegment.selectedSegmentIndex == 1);
}
What do I need to do to get the selected segment shown and then what should I put in the save method of the Detail View to change that selection if possible?
Thanks!
Sorry all - this was just me being stupid.
Implemented with the following code in viewDidLoad:
if ([contract.wasShown boolValue])
{
self.isShownSegment.selectedSegmentIndex = 0;
}
else
{
self.isShownSegment.selectedSegmentIndex = 1;
}
I'm writing some code in Xcode for an iPhone app and I want to be able to detect if a method has been run (i.e. a button was pressed, causing that method to run) in another method (I want to use an if statement so that if the button was pressed it will do this, but if it wasn't then it will do something else).
There is no has_method_been_run() function but you can check to see if the state was changed.
For example say method button_clicked() calls method change_font_to_blue(). In this case you can check to see if the font is blue and there for the method was called.
That's a very basic example of course but you could check any number of variables / the state of the UI to see if it was changed.
OR you can add a boolean to an object and just set it to true when you execute you're method that you're watching.
If your example is simply a button press I would change the UIButton's selected state
- (IBAction)buttonSelected:(UIButton *)sender {
sender.selected = YES;
// OR:
// self.myButton.selected = YES;
}
- (void)otherMethod {
if (self.myButton.isSelected) {
// button has been run through the selector method
// if you want, reset button's selected state
self.myButton.selected = NO;
} else {
// button has NOT been run through the selector method
}
}
This is a simple idea and by default the selected state of a UIButton is not visually different. If you want it to be visually changed then you can simply go into IB and change the visuals there for the selected state (including the title):
Then when the button is set to selected (self.myButton.selected = YES;) it will automatically change what the button looks like!
I have a simple question about event handling in iOS applications... suppose you have an app with some buttons that react to the TouchUpInside event calling the same action, what is the best way within the action method to understand what is the button that triggered the event? I know that it can be easily done using the title of the button, but I think it is not the best way if you have a localized app in which button text may change (unless it is possible to reverse the localization of the title, i.e. retrieve the original string from a localized string)... is there a good practice about this topic? Should I use some other property of buttons to distinguish among different buttons?
Thank you in advance for any help.
There is something called a "Tag" that you can set for UIButtons, or anything that can respond to an event for that matter. If you are using Interface Builder, click the attributes inspector for the item and select a value for the tag (integer). In your code do something like this...
...
- (IBAction)buttonReceived:(id)sender
{
if ([sender tag] == 1) {
//Do something
}
else if ([sender tag] == 2) {
//Do something else
}
}
In addition to the tag property, or just in case you are already using the tag for some other purpose that would mean duplicate tag values for one or more different buttons, you can always set up an IBOutlet ivar to each button you needed to check, and then in the IBAction, do something like this:
- (IBAction)buttonReceived:(UIButton *)sender
{
if (sender == myButtonA) {
// processing for button A
}
else if (sender == myButtonB) {
// processing for button B
}
}
It is a bit more work, but it can come in handy at times.