I have this app and a reset button to reset the values that I entered. I'm trying to get the button to be gray as long as I don't enter a valid value.
When the value is valid, it should enable and become touchable...
How can I do this?
I am using this code but it isn't working...
//Reset values
- (IBAction)resetPressed:(UIButton *)sender {
if (didPan==1) {
resetPressed.enabled = YES;
} else {
resetPressed.enabled = NO;
}
self.prozent=0;
didPan=NO;
//remove drawn intersection line
[intersectionLine removeFromSuperview];
NSLog(#"resetPressed");
}
To enable the button if it matches your criteria, use setEnabled:YES.
E.g.
UIButton *button = (UIButton *)sender;
[button setEnabled:YES];
An even better way to do this would be to use the dot notated version, like such:
button.enabled = YES;
In your condition you are using if (didPan==1) { although it would be giving the required result but it is better to use if(didPan)
secondly resetPresed is action name not the button or sender, so you should use sender instead of resetPressed
and for setting button status use [sender setEnabled:YES];//OR sender.enabled=YES;
so your code would look like this
- (IBAction)resetPressed:(UIButton *)sender {
if (didPan) {
[sender setEnabled:YES]; //OR sender.enabled=YES;
} else {
[sender setEnabled:NO]; // OR sender.enabled=NO;
}
}
If you are entering a value in a UITextField, you could set the delegate for the text field and write code for enabling/disabling inside textFieldDidEndEditing: method of the delegate object.
i.e; theButton.enabled = YES/NO
From your code it looks like you are writing code for disabling the button inside the action of that button itself which won't work if the button is disabled.
***I did solve the problem after long time of searching.
I found out that the ResetButton must have a Property
it looks like this
#property (strong, nonatomic) IBOutlet UIButton *resetButton;
Then I highlighted the button and unchecked enabled from the control(tried it before but it didn't work)
The I used button.enabled=YES and changed the colour using [resetButton setAlpha:1] for normal and [resetButton setAlpha:0.5] for not activated
Thanks guys for your help!*
if you enter the value for example in a UITextField, then use the delegate of the textfield to determine if the value is correct:
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if ([textField.text isValid]) { // check if text in textfield is valid
button.enabled = YES;
} else {
button.enabled = NO;
}
return YES;
}
Related
I am generating 4 dynamic UITextField all with return key type next and when i press next the focus gets transferred to next UITextField but what i want is when 4th UITextField gets focus its return key type must change to Done which when pressed must resign first responder.
for implementing "next" functionality i am using this code
NSUInteger currentIndex = [Feilds1Array indexOfObject:textField];
if(currentIndex>=Feilds1Array.count-1)
{
NSLog(#"change return key type...");
}
else
{
UITextField* nextTextField1 = (UITextField*)Feilds1Array[currentIndex+1] ;
[nextTextField1 becomeFirstResponder] ;
}
this might be an easy one but i am not able to figure this out as i am a newbie
so please help me out
Thanks in advance...
Do like this,
In your textField delegate method,
access the 4th textfield by using tag value or as you did already,
- (void)textFieldDidBeginEditing:(UITextField *)textField {
if([textField isEqual:textField4])
textField4.returnKeyType = UIReturnKeyDone;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
if([textField isEqual:textField4])
[textField resignFirstResponder];
return YES;
}
textField.returnKeyType = UIReturnKeyDone;
If your text field is generated by xib in that case you need to set return key of last text field in your xib Done. See in the below image
other wise
NSUInteger currentIndex = [Feilds1Array indexOfObject:textField];
if(currentIndex>=Feilds1Array.count-1)
{
NSLog(#"change return key type...");
UITextField* nextTextField1 = (UITextField*)Feilds1Array[currentIndex+1] ;
nextTextField1.returnKeyType = UIReturnKeyDone;
[nextTextField1 becomeFirstResponder] ;
}
else
{
UITextField* nextTextField1 = (UITextField*)Feilds1Array[currentIndex+1] ;
[nextTextField1 becomeFirstResponder] ;
}
If you are creating UITextField dynamically then you can set the property as
textfieldName.returnKeyType = UIReturnKeyDone;
in your case you can set the above property to the 4th textfield.
I am fairly new to iphone programming and here I am facing some issues. Now in my application, I have two textfields and I want to fire an event while second textfield starts editing. now I am using following function
- (void)textFieldDidBeginEditing:(UITextField *)textField
but the thing is the event is being fired when the first textfield starts editing. It does not wait for the second text field. Is there any way I can use this function for the second textfield or may be somehow could know and pass it the value of the active textfield?
I tried writing the name of the textfield instead of (UITextField *)textField in the function but still the same result.
If I were you , I would set a tag (in Interface Builder) of the second textField to 2, or something similar. Then you can just do this:
-(void)textFieldDidBeginEditing:(UITextField *)textField {
if (textField.tag == 2) {
//this is textfield 2, so call your method here
}
}
EDIT: Please do this to see if the method is even called:
-(void)textFieldDidBeginEditing:(UITextField *)textField {
NSLog(#"The method was called");
}
For Swift 2.2
func textFieldDidBeginEditing(textField: UITextField) {
if textField.tag == 2 {
//this is textfield 2, so call your method here
}
}
That delegate method is gonna get called everytime the editing of ANY text field is started, so it should be you who controls what is done when this happens. I suggest you to do something like:
-(void)textFieldDidBeginEditing: (UITextField *)textField
{
if (textField == mySecondTextField)
{
//Do what you need
}
else
{
//Do nothing
}
}
I hope it helps you!
Utilitize the tag property in Interface Builder to identify your view objects in your application at runtime. It will make life a lot easier, especially when you get ready to localize your application for different languages.
In your header file for your view controller
#define kUsernameField 100
#define kPasswordField 101
#define kStartButton 300
In the view controller implementation file
- (void)textFieldDidBeginEditing:(UITextField *)textField {
switch (textField.tag) {
case kUsernameField:
// do user name stuff
break;
case kPasswordField:
// do password stuff
break;
default:
NSLog(#"No case statement for %#", [textField description]);
break;
}
}
You will find a lot of tutorial out there that use the title field of UIButton to identify them. For example:
- (IBAction)buttonTouchUp:(id)sender {
UIButton *button = (UIButton *)sender;
// don't like
if ([button.currentTitle isEqualToString:#"Start"] == NSOrderedSame) {
// because if localize your for other language then you will have
// include code for those other language
// French: Démarrer
// Spanish: Inicio
// blah blah blah
}
// better
if (button.tag == kStartButton) {
// very simple, no code changes for localization
// blah blah blah
}
}
If you are creating the object with code, you can set the tag:
button.tag = kStartButton;
// or
[button setTag:kStartButton];
You must declare first UITextFieldDelegate in your controller .h
And set the delegate of your text field. ex. myInput.delegate = self;
-(void)textFieldDidBeginEditing:(UITextField *)sender
{
if ([sender isEqual:myInput])
{
NSLog(#"test");
}
}
This works perfectly for me.
Have you checked if your second textViews delegate is set to self ? I had the same issue where I had forgotten to set the delegate of other textFields and hence the delegate method was not firing.
Please have a look to my answer in this Question, it's exactly what you're looking for
Objective C: what is a "(id) sender"?
I have created a window based application with a UITabbarController as the RootViewController.
In one of the tabs, i have provided UITextField and UITextView.
I want to provide two buttons on the keyboard itself:
Done - which will hide the keyboard.
Enter - for new line.
Please post your answer if anybody has some idea how to do it.
For the UITextField you can change the return key to a done key by setting the following:
targetTextField.returnKeyType = UIReturnKeyDone;
However, you won't be able to have a Enter and Done key at the same time without custom addition of views to the keyboard.
Also, to control the done behavior of the keyboard you have to implement a UITextFieldDelegate method:
targetTextField.delegate = self;
- (BOOL)textFieldShouldReturn:(UITextField *)textField{
return YES; //dismisses the keyboard
}
I know you can set the returnKeyType for a UITextView but I'm not sure if you can manipulate the return key behavior.
You have a tutorial on how add subviews to the iPhone keyboard here :
http://www.iphonedevsdk.com/forum/iphone-sdk-tutorials/7350-adding-subviews-custimize-keyboard.html
Hope this helps,
Vincent
For some reason return YES; didn't work on its own. that worked for me :
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
if (textField.returnKeyType == UIReturnKeyNext) {
NSInteger nextTag = textField.tag + 1;
// Try to find next responder
UIResponder* nextResponder = [textField.superview viewWithTag:nextTag];
if (nextResponder) {
// Found next responder, so set it.
[nextResponder becomeFirstResponder];
}
}
if (textField.returnKeyType == UIReturnKeyDone) {
[textField resignFirstResponder];
}
return YES; //dismisses the keyboard
}
I have the following code
-(IBAction)ATapped:(id)sender{
//want some way to hide the button which is tapped
self.hidden = YES;
}
Which is linked to multiple buttons. I want to hide the button which triggered this IBAction.
self.hidden is obviously not the button.
How do I hide the button which was tapped? The sender.
Thanks
Both Vladimir and Henrik's answers would be correct. Don't let the 'id' type scare you. It's still your button object it's just that the compiler doesn't know what the type is. As such you can't reference properties on it unless it is cast to a specific type (Henrik's answer).
-(IBAction)ATapped:(id)sender{
// Possible Cast
UIButton* myButton = (UIButton*)sender;
myButton.hidden = YES;
}
Or you can send any message (call any method) on the object, assuming YOU know the type (which you do, it's a button), without having to cast (Vladimir's answer).
-(IBAction)ATapped:(id)sender{
//want some way to hide the button which is tapped
[sender setHidden:YES];
}
Send setHidden message to sender:
-(IBAction)ATapped:(id)sender{
//want some way to hide the button which is tapped
[sender setHidden:YES];
}
Your getting the button object (id) provided as a parameter
-(IBAction)ATapped:(id)sender{
// Possible Cast
UIButton* myButton = (UIButton*)sender;
myButton.hidden = YES;
}
If you want bullet proof cast/messaging, try this:
-(IBAction)ATapped:(id)sender{
// Secure Cast of sender to UIButton
if ([sender isKindOfClass:[UIButton class]]) {
UIButton* myButton = (UIButton*)sender;
myButton.hidden = YES;
}
}
And... if you want to change the backgroundcolor of a button, the correct code will be like this?
[sender setBackgroundColor:(NSColor *)redColor];
for example? ... because it is´nt works for my...
I've got a UISearchBar in my interface and I want to customise the behaviour of the the small clear button that appears in the search bar after some text has been entered (it's a small grey circle with a cross in it, appears on the right side of the search field).
Basically, I want it to not only clear the text of the search bar (which is the default implementation) but to also clear some other stuff from my interface, but calling one of my own methods.
I can't find anything in the docs for the UISearchBar class or the UISearchBarDelegate protocol - it doesn't look like you can directly get access to this behaviour.
The one thing I did note was that the docs explained that the delegate method:
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText;
is called after the clear button is tapped.
I initially wrote some code in that method that checked the search bar's text property, and if it was empty, then it had been cleared and to do all my other stuff.
Two problems which this though:
Firstly, for some reason I cannot fathom, even though I tell the search bar to resignFirstResponder at the end of my method, something, somewhere is setting it back to becomeFirstResponder. Really annoying...
Secondly, if the user doesn't use the clear button, and simply deletes the text in the bar using the delete button on the keyboard, this method is fired off and their search results go away. Not good.
Any advice or pointers in the right direction would be great!
Thanks!
Found the better solution for this problem :)
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
if ([searchText length] == 0) {
[self performSelector:#selector(hideKeyboardWithSearchBar:) withObject:searchBar afterDelay:0];
}
}
- (void)hideKeyboardWithSearchBar:(UISearchBar *)searchBar{
[searchBar resignFirstResponder];
}
The answer which was accepted is incorrect. This can be done, I just figured it out and posted it in another question:
UISearchbar clearButton forces the keyboard to appear
Best
I've got this code in my app. Difference is that I don't support 'live search', but instead start searching when the user touches the search button on the keyboard:
- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {
if ([searchBar.text isEqualToString:#""]) {
//Clear stuff here
}
}
Swift version handling close keyboard on clear button click :
func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
if searchText.characters.count == 0 {
performSelector("hideKeyboardWithSearchBar:", withObject:searchBar, afterDelay:0)
}
}
func hideKeyboardWithSearchBar(bar:UISearchBar) {
bar.resignFirstResponder()
}
You could try this:
- (void)viewDidLoad
{
[super viewDidLoad];
for (UIView *view in searchBar.subviews){
for (UITextField *tf in view.subviews) {
if ([tf isKindOfClass: [UITextField class]]) {
tf.delegate = self;
break;
}
}
}
}
- (BOOL)textFieldShouldClear:(UITextField *)textField {
// your code
return YES;
}
I would suggest using the rightView and rightViewMode methods of UITextField to create your own clear button that uses the same image. I'm assuming of course that UISearchBar will let you access the UITextField within it. I think it will.
Be aware of this from the iPhone OS Reference Library:
If an overlay view overlaps the clear button, however, the clear button always takes precedence in receiving events. By default, the right overlay view does overlap the clear button.
So you'll probably also need to disable the original clear button.
Since this comes up first, and far as I can see the question wasn't really adequately addressed, I thought I'd post my solution.
1) You need to get a reference to the textField inside the searchBar
2) You need to catch that textField's clear when it fires.
This is pretty simple. Here's one way.
a) Make sure you make your class a , since you will be using the delegate method of the textField inside the searchBar.
b) Also, connect your searchBar to an Outlet in your class. I just called mine searchBar.
c) from viewDidLoad you want to get ahold of the textField inside the searchBar. I did it like this.
UITextField *textField = [self.searchBar valueForKey:#"_searchField"];
if (textField) {
textField.delegate = self;
textField.tag = 1000;
}
Notice, I assigned a tag to that textField so that I can grab it again, and I made it a textField delegate. You could have created a property and assigned this textField to that property to grab it later, but I used a tag.
From here you just need to call the delegate method:
-(BOOL)textFieldShouldClear:(UITextField *)textField {
if (textField.tag == 1000) {
// do something
return YES;
}
return NO;
}
That's it. Since you are referring to a private valueForKey I can't guarantee that it will not get you into trouble.
Best solution from my experience is just to put a UIButton (with clear background and no text) above the system clear button and than connect an IBAction
- (IBAction)searchCancelButtonPressed:(id)sender {
[self.searchBar resignFirstResponder];
self.searchBar.text = #"";
// some of my stuff
self.model.fastSearchText = nil;
[self.model fetchData];
[self reloadTableViewAnimated:NO];
}
Wasn't able to find a solution here that didn't use a private API or wasn't upgrade proof incase Apple changes the view structure of the UISearchBar. Here is what I wrote that works:
- (void)viewDidLoad {
[super viewDidLoad];
UITextField* textfield = [self findTextFieldInside:self.searchBar];
[textfield setDelegate:self];
}
- (UITextField*)findTextFieldInside:(id)mainView {
for (id view in [mainView subviews]) {
if ([view isKindOfClass:[UITextField class]]) {
return view;
}
id subview = [self findTextFieldInside:view];
if (subview != nil) {
return subview;
}
}
return nil;
}
Then implement the UITextFieldDelegate protocol into your class and overwrite the textFieldShouldClear: method.
- (BOOL)textFieldShouldClear:(UITextField*)textField {
// Put your code in here.
return YES;
}
Edit: Setting the delegate on the textfield of a search bar in iOS8 will produce a crash. However it looks like the searchBar:textDidChange: method will get called on iOS8 on clear.