so I'm very new to swift. I currently have 16 buttons all set to individual outlets box1,box2,box3 etc.
Each box I have set a tag and what I am trying to do is set the image of a particular box based off another integer variable to determine which box I'm changing.
So say I do a calculation and index = 4.
Is there a way I can then set box(index).setImage?
I understand this probably isn't the best way to do it or even possible, maybe I can set each button to an array of objects instead? Any tips would be great.
If you want to set the image of button through some tag then you don't need any outlets for the buttons.
You can change your button image by finding the button through viewWithTag() property.
Here is the code
var button = self.view.viewWithTag(Your_Calculated_Index) as! UIButton
button.setImage(Your_Image, for: .normal)
You can try this. You need to create an array for the button.
#IBOutlet var allbtns: [UIButton]!
for buttons in allbtns{
if buttons.tag == 4{
print("Button 4 ");
buttons.setImage(UIImage(named: "imagname"), for: UIControlState.normal)
}else{
print("Other buttons except 4 ");
}
}
Related
I have four imageview contents in an XIB and a button that covers all my XIB. I want to make when the user tap the button, the first imageview is shown, the next tap is hidden and the second imageview is displayed and so on until all my imageview is shown / hidden. What would be the most efficient way to do it?
Save all your UIImageViews to an array, and current showing imageView to a variable, it may look like this:
var imageViews: [UIImageView] = []
var currentImageViewIndex = 0 {
didSet {
if currentImageViewIndex >= imageViews.count { currentImageViewIndex = 0 }
imageViews[oldValue].isHidden = true
imageViews[currentImageViewIndex].isHidden = false
}
}
func handleTap() {
currentImageViewIndex += 1
}
I suggest you use a state variable that contains an enum listing the various states (firstImageVisible, secondImage.... ) then you can have a function inside the enum that switches to the nextState (being the target of your button action) you can also easily iterate through states of an enum, check the documentation for the CaseIterable protocol. Often having a property observer (didSet) on the state is a handy place to update other parts of the UI which need to change every time the state changes.
I work on Swift 3, and I'm trying to make checkboxes that behave like radio buttons. I explain myself : I have 8 buttons ; each has an "unchecked" image and a "checked" image. I want only 1 button to be selected (so, showing ITS "checked" image) at the time. The principle of radio buttons.
So I tried using the #IBAction with each button, I've this :
#IBAction func tona1_changed(_ sender: Any) {
if test_tona1.isSelected == true
{
test_tona1.setBackgroundImage(UIImage(named: "0b_unchecked"), for: UIControlState.normal)
test_tona1.isSelected = false
}
else
{
test_tona1.setBackgroundImage(UIImage(named: "0b_checked"), for: UIControlState.normal)
test_tona1.isSelected = true
}}
It actually make the image switch between "uncheck" and "check" but I don't know at all how to make it interact with the other buttons.
I tried using an array with the buttons's tags inside but I didn't have something working. I also tried to make a class but I don't know how it can work.
Thanks!
You can achieve that in several ways. One of the most trivial would be to:
Have a datasource. Most of the time an array.
Create an UIButton for each item in your datasource, and insert each button into another array. Each button would have a tag corresponding at the
index of the array. Also set different images for selected state and normal.
Add an action for each button, with the target function being something like:
func buttonPressed(sender:UIButton) {
for button in buttons {
button.isSelected = false
// deselect your model datasource[button.tag]
}
sender.isSelected = true
// select your model datasource[button.tag]
}
I leave the abstraction / improvements / safety to you. The key point is just to use a collection of buttons, iterate through them, and select / deselect them accordingly, and not using a big if/else checking for the button tag everytime.
I have an app with some buttons, when those buttons are pressed the image on them should change. I assume that the TouchUpInside runs when you tap and remove the finger while still holding inside the area of the element, however it only works rarely and I'm not sure why.
The reason I use TouchUpInside instead of TouchDown is because I want the user to be able to cancel the action.
I'm sorry if I've misunderstood anything about those events and if this has already been asked. I couldn't find an answer to my problem searching the web.
//The IBAction is set to trigger on TouchUpInside
#IBAction func action11(sender: UIButton) {
setTile(sender)
}
func setTile(sender: UIButton) {
if turn {
print("O's turn")
sender.setImage(xTile, forState: .Normal)
turn = false
}
}
EDIT: Added the necessary code
There are some properties of UIButtons which you can use to achieve what you want.
You can use Default and selected state of uibutton to set two different images.
In XIB select state "Default" and assign default image to that state again select state to "Selected" and assign image which you want after button section.
and add following line in button selection method.
-(IBAction)buttonTapped:(UIButton *)sender{
sender.selected = !sender.selected;
}
Your understanding is correct, you need to use touchUpInside.
I assume you are trying to create a button that has a toggle function. On one touch you want the button to have the value Say "X" and when touched again the button has a value "O".
Take a look at this code below, this should do the job.
class ViewController: UIViewController {
var isButtonPressed = false{
// Adding a Property Observer, that reacts to changes in button state
didSet{
if isButtonPressed{
// Set the Value to X.
}else{
// Set the Value to O.
}
}
}
#IBAction func changeButtonValue(sender: UIButton) {
// Toggle the button value.
isButtonPressed = !isButtonPressed
}
}
If you don't set turn=true after the first time, this code is executed it will be executed only one.
if turn {
print("O's turn")
sender.setImage(xTile, forState: .Normal)
turn = false
}
Check if the button frame is large enough to get finger touch.
Apple says at least 35x35 pixel.
I'm implementing a favourite button in swift for my quote application. Since I want to disable the user to be able to favourite a quote twice. I must change the text to unlike and then compare the button text mode being unlike to the button text mode being like. And then do furthermore things based on these conditions. It would look something like:
#IBAction func favour(sender: AnyObject) {
if liketext.text == "Like"{
liketext.setTitle("Unlike", forState: UIControlState.Normal)
makeQuoteFavourite()
} else if liketext.text == "Unlike" {
liketext.setTitle("Like", forState: UIControlState.Normal)
}
}
However as many of you know, a button outlet cannot have the .text function. #IBOutlet var liketext: UIButton! How would I be able to compare button strings to normal strings? Are there other possible solutions?
UIButtons simply work differently than UILabels. They have control states for one thing. And their (title) text can be set on a per-control-state basis.
So you have to use the currentTitle property:
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIButton_Class/#//apple_ref/occ/instp/UIButton/currentTitle
or the titleForState method:
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIButton_Class/#//apple_ref/occ/instm/UIButton/titleForState:
Now those titles are normal String objects; it's the name of the property that's different.
I have created 6 UIImageViews on a ViewController, and I am later going to add TapGestureRecognizers to all of them.
I want to make it so that depending on what image has been clicked, another ViewController will open and display certain information.
For this to happen, I need to know which image has been clicked. How would I do this in Swift?
UIGestureRecognizer has property 'view' this property is the view you add it to. For this example the imageView.
func tap(gesture: UIGestureRecognizer) {
println(gesture.view!.tag) // You can check for their tag and do different things based on tag
}
let img = UIImageView()
img.userInteraction = true
img.tag = 0
img.addGestureRecognizer(UITapGestureRecognizer(self, action: "tap:"))