I have a record button, which when pressed, I want to hide the instructions button.
Here's the code for the record button:
// Create custom overlay
// Create instruction/record button
// Add instruction/record button to custom overlay
[_videoRecordBtn addTarget:self action:#selector(startVideoRecord:) forControlEvents:UIControlEventTouchUpInside];
So in startVideoRecord I should have something like:
-(IBAction)startVideoRecord:(id)sender{
[_instru setHidden:YES];
// start recording...
}
But I have no idea how to pass the _instru button over to startVideoRecord.
Add a property to your ViewController to keep a reference to your instructionsButton:
#property (nonatomic, strong) UIButton *instructionsButton;
When you create your instructionsButton, assign it to this property.
Then you can access the button via this property anywhere in your ViewController with self. instructionsButton.
So, your action method would be like:
-(IBAction)startVideoRecord:(id)sender{
self.instructionsButton.hidden = YES;
// start recording...
}
You can do this by 2 way..
1 way - > you set the tag of instructions button.
and use this
-(IBAction)startVideoRecord:(id)sender{
UIButton *instruBtn = (UIButton*)[self.view viewWithTag:your button tag];
instruBtn.hidden = YES;
// start recording...
}
2nd Way - > you make property for your instructions button and use like this
-(IBAction)startVideoRecord:(id)sender{
self.instruBtn.hidden = YES;
// start recording...
}
Related
I have 3 buttons in my storyboard and ViewController that are working as expected:
- (IBAction)button0:(id)sender {
[sender setTitle:#"btn0 pressed" forState:UIControlStateNormal];
}
- (IBAction)button1:(id)sender {
[sender setTitle:#"btn1 pressed" forState:UIControlStateNormal];
}
- (IBAction)button2:(id)sender {
[sender setTitle:#"btn2 pressed" forState:UIControlStateNormal];
}
I have a fourth button that, when pressed, I would like to change the displayed text of button0-2 to an empty string.
- (IBAction)resetAllButtons:(id)sender {
//In Android this code would be something like:
//Button btn0 = (Button) findViewById(R.id.button0);
//btn0.setText(" ");
}
How do I do this? I've found many ways to change the button text, but only of the current button being pressed. Can I target all the buttons by id somehow?
Figured it out (although still not clear on why it works?)
I connected button0 as an IBOutlet in my ViewController.h file.
#property (weak, nonatomic) IBOutlet UIButton *button0;
From there I was able to reference it in my ViewController.m file using
[self.button0 setTitle:#" " forState:UIControlStateNormal];
But why am I able to do that? I thought that if I declared
- (IBAction)button0:(id)sender;
in my ViewControler.h file that I couldn't also have an outlet connected to the same object? Thanks for reading either way.
I am creating a simple category of UIViewController which adds the possibility to show a button simply on top of the view to display a chat window.
#interface UIViewController (ChatButton)
- (void)showChatButtonFromTop;
- (void)showChatButtonFromBottom;
- (void)hideButton;
#end
Now in the method I create a button and display it:
- (void)showChatButtonFromTop
{
UIButton* chatBtn = [self constructButtonWithWidth:buttonAxisSize X:buttonX Y:buttonY];
[self.view addSubview:chatBtn];
}
But I also need to hide the button:
- (void)hideButton
{
// confusion!
}
How do I get that button? Categories don't allow for properties, so how do I store the reference?
when you add the button to view, add a tag to button
chatBtn.tag = 1234;
[self.view addSubview:chatBtn];
when you try to hide the button access it's tag
- (void)hideButton
{
UIButton *chatBtn = (UIButton *)[self.view viewWithTag:1234];
[chatBtn setHidden:YES];
}
I have a UIButton. I bound a target as follows.
[button addTarget:self action:#selector(myFunction)
forControlEvents:UIControlEventTouchUpInside];
When i click my Button multiple times quickly it invoke the target function multiple times.
On Tapping button i present a new View controller.
when i click 3 times quickly then my new view controller is shown 3 times.
This is something stupid. Whats the point of triggering the function again once the View has been shifted to a new View controller. Why the Hell Apple do such stupid things ?
Any Help please?
First of all its not apple bugs. It should be handle manually. So follow these step
First make your global instance of your button then do this
.h file
#property (weak, nonatomic) IBOutlet UIButton *btn;
.m file
- (IBAction)myFunction:(id)sender
{
self.btn.userInteractionEnabled = NO;
}
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
self.btn.userInteractionEnabled = YES;
}
Take one global bool flag like "isItDone" or it declare in singleton class.
in "myFunction" set it as false
which View controller you push on that function in that class's "ViewDidAppear" method set as true.
it will help you.
I have same problem and it is good solution for that to manage it using one global variable.
I think this will help you.
Change your calling function like this
- (IBAction)myFunction:(id)sender
{
UIButton *button = (UIButton*)sender;
button.userInteractionEnabled = NO;
}
and call your function like this
[button addTarget:self action:#selector(myFunction:)
forControlEvents:UIControlEventTouchUpInside];
if you want to store the selection incase you came back to the view controller then only you need to keep a boolean flag to store if its clicked once or not.
Set the IBOutlet to your button, in the viewWillAppear method write,
button.userInteractionEnabled = YES;
and when you click on the button set,
button.userInteractionEnabled = NO;
i have a Navigation Bar, wich contains a Navigation Item, which contains 2 Bar Buttons, these are created in the Storyboard, and i wanted to change 1 of the buttons at runtime, now this works:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
UINavigationItem *thisNavBar = [self myNavigationItem];
thisNavBar.rightBarButtonItem = nil; // this works, it gets removed
UIBarButtonItem *insertBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:#selector(insertSkemaItem:)];
thisNavBar.rightBarButtonItem = insertBtn; // this also works, it sets the btn
}
Now, in my other method, which is called by another controller, it does not work
- (void)callChildChange {
...
// remove old btn
UINavigationItem *thisNavBar = [self skemaNavigationItem];
thisNavBar.rightBarButtonItem = nil; // does not work?
}
There is nothing wrong with the method, it runs just fine, but the nav btn item does not get removed ?
skemaNavigationItem is a Navigation item, declared in the .h file which links the navigation item i made via the storyboard.
Your UI items need to be added to your code (by ctrl-dragging) in the header file (.h) so they can be publicly accessed from other classes/view controllers.
Presuming you've done this, hiding a UI item is best done by using
relevantClass.yourViewObject.hidden = YES;
or if you really need to delete it for good,
[relevantClass.yourViewObject.view removeFromSuperView];
Edits
Options for changing target method:
Declare #property (nonatomic, assign) BOOL myButtonWasPressed; and:
- (IBAction) myButtonPressed
{
if (!self.myButtonWasPressed)
{
// This code will run the first time the button is pressed
self.myButton.text = #"New Button Text";
self.myButtonWasPressed = YES;
}
else
{
// This code will run after the first time your button is pressed
// You can even set your BOOL property back, and make it toggleable
}
}
or
- (IBAction) myButtonWasPressedFirstTime
{
// do what you need to when button is pressed then...
self.myButton.text = #"New Button Text";
[self.myButton removeTarget:self action:#selector(myButtonPressedFirstTime) forControlEvents:UIControlEventTouchUpInside];
[self.myButton addTarget:self action:#selector(myButtonPressedAgain) forControlEvents: UIControlEventTouchUpInside];
}
- (IBAction) myButtonWasPressedAgain
{
// this code will run the subsequent times your button is pressed
}
I am trying to find the best approach to doing this. I have 5 custom buttons on a view controller and I am trying to have the button stay highlighted if it is clicked. I know how to do this but I am trying to only allow 1 button to be highlighted at a time. So if a user clicks a button and highlights it, but clicks another, then the most recent button clicked will stay highlighted and the previous will unhighlight. What would be the best way to accomplish this?
You should keep a reference to all your buttons (for example, if you use IB, have links in your code like #property (nonatomic, strong) IBOutlet UIButton *button1; for all your buttons).
Then link all your buttons to the same method for a press on the button. I'll call it buttonPressed.
Impement it like this :
- (IBAction)buttonPressed:(id)sender {
UIButton *buttonPressed = (UIButton*)sender;
NSArray *buttons = [NSArray arrayWithObjects:_button1, _button2, _button3, nil];
bool buttonIsHighlighted = NO;
// Check if a button is already highlighted
for (UIButton *button in buttons) {
if (button.highlighted) {
buttonIsHighlighted = YES;
}
}
// If a button is highlighted, un-highlight all except the one pressed
// If no button is highlighted, just highlight the right one
if (buttonIsHighlighted) {
for (UIButton *button in buttons) {
if (buttonPressed == button) {
buttonIsHighlighted = YES;
} else {
button.highlighted = NO;
}
}
} else {
buttonPressed.highlighted = YES;
}
}
I can't test this code but I'm pretty sure it should work. Let me know if something's wrong.
Solution 1:
Put your buttons in an NSArray and when user clicks on a button check if another is highlighted. If YES, unhighlight it and highlight the one was pressed. If NO, highlight directly the one pressed.
Solution 2:
You can save the highlighted button in a global variable declared in #interface or in a #property. When users click the new one unhighlight the previous.