I'm having trouble capturing taps on a UIButton that's a subview of a UIView. Here's how my code is setup:
// in MyClass.m
#interface MyClass ()
#property (nonatomic, retain) UIButton *myButton;
#end
#implementation MyClass
#synthesize myButton;
- (void) buttonTapped:(id) sender {
NSLog(#"button tapped!");
}
- (id) initWithFrame:(CGRect)frame {
if (!(self = [super initWithFrame:CGRectZero]))
return nil;
myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[myButton setImage:[UIImage imageNamed:#"image.png"]
forState:UIControlStateNormal];
[myButton addTarget:self
action:#selector(buttonTapped:)
forControlEvents:UIControlEventTouchUpInside];
myButton.exclusiveTouch = YES;
myButton.frame = CGRectMake(100, 100, 100, 100);
[self addSubview:myButton];
return self;
}
- (void) dealloc {
[myButton release];
[super dealloc];
}
#end
The button appears in the view. The button color changes momentarily when I tap it. However the selector buttonTapped: is never called. Any idea why?
How can I verify that buttonTapped: is indeed a target of myButton?
You could verify that your current class is a target by logging the r
NSLog(#"actions for target %#",[myButton actionsForTarget:self forControlEvent:UIControlEventTouchUpInside]);
However, I added your code to a test project (single view template) and the buttonTapped: method worked.
- (void) buttonTapped:(id) sender {
NSLog(#"button tapped!");
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
self.viewController = [[[ViewController alloc] initWithNibName:#"ViewController" bundle:nil] autorelease];
self.window.rootViewController = self.viewController;
UIButton * myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[myButton setImage:[UIImage imageNamed:#"image.png"]
forState:UIControlStateNormal];
[myButton addTarget:self
action:#selector(buttonTapped:)
forControlEvents:UIControlEventTouchUpInside];
myButton.exclusiveTouch = YES;
myButton.frame = CGRectMake(100, 100, 100, 100);
[rv.view addSubview:myButton];
return YES;
}
The issue is somewhere else. Is the code posted the whole .h and .m for MyClass?
Related
Here is the main idea
+---MyViewController.m----+ +---BtnOnClickResp.m-----+
| | EventTouchUpInside: | |
| Button ---------------------------------------> OnBtnClick() |
| | textView.text=#"blabla"| | |
| *textView <------------------------------------------ + |
| | | |
+-------------------------+ +------------------------+
I want to test if button OnClick could be pressed in another controller like this:
MyViewController.h
#import <UIKit/UIKit.h>
#interface MyViewController : UIViewController
#property (nonatomic, strong) UITextView *textView;
+(id) sharedInstance;
#end
MyViewController.m
#import "MyViewController.h"
#import "BtnOnClickResp.h"
#interface MyViewController ()
#end
#implementation MyViewController
#synthesize textView;
+ (id) sharedInstance{
static MyViewController *instance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [[self alloc] init];
});
return instance;
}
- (void) setUpScene{
textView = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 500, 400) ];
[textView setBackgroundColor:[UIColor grayColor]];
[textView setFont:[UIFont systemFontOfSize:18]];
[textView setTextColor:[UIColor blackColor]];
textView.text = #"";
[self.view addSubview:textView];
UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(100, 50 , 400, 50)];
[btn setTitle:#"Click Me" forState:UIControlStateNormal];
[btn setBackgroundColor:[UIColor yellowColor]];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[btn addTarget:[[BtnOnClickResp alloc] init] action:#selector(onBtnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
- (void)viewDidLoad {
[super viewDidLoad];
[self setUpScene];
// Do any additional setup after loading the view.
}
#end
BtnOnClickResp.h
#import <UIKit/UIKit.h>
#interface BtnOnClickResp : UIViewController
#end
BtnOnClickResp.m
#import "BtnOnClickResp.h"
#import "MyViewController.h"
#interface BtnOnClickResp ()
#end
#implementation BtnOnClickResp
- (void) onBtnClick: (UIButton *) btn{
NSLog(#"btn was click but I am in another controller");
MyViewController *control = [MyViewController sharedInstance];
control.textView.text = #" I am setting this content in another view cheers!!!";
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
The main idea is draw/add a button view in the MyViewController and make the response to click code in another controller, I thought the action assignment code:
[btn addTarget:self action:#selector(onBtnClick:) forControlEvents:UIControlEventTouchUpInside];
if we change the self to the actually controller we want to use then the click event will be dispatched to that controller
But it seems not working.
Really a beginner of ios development would be happy if you don't downvote this beginner's question.
EIDT
After taking the advice as #Mike suggested,
I change the MyViewController.m to this:
#import "MyViewController.h"
#import "BtnOnClickResp.h"
#interface MyViewController (){
//here is the change , I made a private ref of the controller
BtnOnClickResp *respContl;
}
#end
#implementation MyViewController
#synthesize textView;
+ (id) sharedInstance{
static MyViewController *instance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [[self alloc] init];
});
return instance;
}
- (void) setUpScene{
textView = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 500, 400) ];
[textView setBackgroundColor:[UIColor grayColor]];
[textView setFont:[UIFont systemFontOfSize:18]];
[textView setTextColor:[UIColor blackColor]];
textView.text = #"";
[self.view addSubview:textView];
UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(100, 50 , 400, 50)];
[btn setTitle:#"Click Me" forState:UIControlStateNormal];
[btn setBackgroundColor:[UIColor yellowColor]];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[btn addTarget:respContl action:#selector(onBtnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
- (void)viewDidLoad {
respContl = [[BtnOnClickResp alloc] init];
[super viewDidLoad];
[self setUpScene];
// Do any additional setup after loading the view.
}
#end
Now I could see the NSLog of btn was click but I am in another controller but the view content still kept not changed to #" I am setting this content in another view cheers!!!" as it expected to be in BtnOnClickResp.m
This is the launch code in AppDelagate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UIViewController *control = [[MyViewController alloc] init];
[self.window setRootViewController:control];
[self.window setBackgroundColor:[UIColor greenColor]];
[self.window makeKeyAndVisible];
// Override point for customization after application launch.
return YES;
}
You are adding Target
[btn addTarget:[[BtnOnClickResp alloc] init] action:#selector(onBtnClick:) forControlEvents:UIControlEventTouchUpInside];
to
[BtnOnClickResp alloc] init]
is Wrong
Because it will create new instance and add listener to it.
However you are try to access action in other instance
You have 4 solutions
Create shared instance of BtnOnClickResp and assign target to it
Pass the self of BtnOnClickResp to the MyViewController on and assign it
Create Delegate
Post Notification
Declare a property of BtnOnClickResp and set it as button target.
#import "MyViewController.h"
#import "BtnOnClickResp.h"
#interface MyViewController ()
#property(nonatomic, strong) BtnOnClickResp onClickRespObj;
#end
#implementation MyViewController
#synthesize textView;
+ (id) sharedInstance{
static MyViewController *instance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
instance = [[self alloc] init];
});
return instance;
}
- (id)init{
if(self = [super init]){
self.onClickRespObj = [[BtnOnClickResp alloc] init];
}
return self;
}
- (void) setUpScene{
textView = [[UITextView alloc] initWithFrame:CGRectMake(0, 0, 500, 400) ];
[textView setBackgroundColor:[UIColor grayColor]];
[textView setFont:[UIFont systemFontOfSize:18]];
[textView setTextColor:[UIColor blackColor]];
textView.text = #"";
[self.view addSubview:textView];
UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(100, 50 , 400, 50)];
[btn setTitle:#"Click Me" forState:UIControlStateNormal];
[btn setBackgroundColor:[UIColor yellowColor]];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[btn addTarget:self.onClickRespObj action:#selector(onBtnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}
- (void)viewDidLoad {
[super viewDidLoad];
[self setUpScene];
// Do any additional setup after loading the view.
}
#end
I am not able to call the method which is written in UIViewController(aViewController) from my custom view bView .
I want to call the method function on my button(btn) click in UIView(bView). But when I click the button, i am getting the following error.
unrecognized selector sent to instance....
Here is my code:
aViewController.h
#import "bView.h"
#import "cViewController.h"
-(void)function;
aViewController.m
-(void)viewDidLoad{
bView = [[bView alloc]init];
[bView makeView];
bView.bViewController = self;
[self.view addSubView:bView];
}
-(void)function{
cViewController *nextViewController = [[cViewController alloc] initWithNibName: nil bundle: nil];
[self.navigationController pushViewController: nextViewController animated: YES];
}
bView.h
#import "bViewController.h"
#interface bView : UIView{
UIButton btn;
bView *BView;
}
-(void)makeView;
-(void)function;
#property (nonatomic,readonly) UIButton *btn;
#property (assign) UIViewController* aViewController;
bView.m
#import "bView.h"
#import "aViewController.h"
#impementation bView
#synthesize btn;
#synthesize aViewController;
-(void)makeView{
btn= [UIButton buttonWithType:UIButtonTypeRoundedRect];
UIImage *btnimg = [UIImage imageNamed:#"btn.png"];
[btn setBackgroundImage:btnimg forState:UIControlStateNormal];
btn.frame = CGRectMake(65, 380, 60, 60);
[self addSubview:btn];
btn.userInteractionEnabled = YES;
[btn addTarget:aViewController action:#selector(function) forControlEvents:UIControlEventTouchUpInside];
}
How to solve it?
You are setting a target to button in [bView makeView]; method, but at that time bView's aViewController is nil because you are setting it only on the next line. So try this:
-(void)viewDidLoad{
bView = [[bView alloc]init];
bView.bViewController = self;
[bView makeView];
[self.view addSubView:bView];
}
this is how you do it, first off, get rid of the "bView.bViewController = self", it doesn't work that way, you shouldn't do this, ever.
-(void)viewDidLoad {
bView = [[bView alloc]init];
[bView makeView];
[self.view addSubView:bView];
[[bView btn] addTarget:self action:#selector(function) forControlEvents:UIControlEventTouchUpInside];
}
function is declared in your UIViewController, not your UIView, so you must call to the button in your viewdidLoad through the bView and then assign it a target and action. I still wouldn't use this method that you are using, but this will do it.
this is the magic:
[[bView btn] addTarget:self action:#selector(function) forControlEvents:UIControlEventTouchUpInside];
AND, remove these lines from the UIView:
#property (assign) UIViewController* aViewController;
-(void)function;
[btn addTarget:aViewController action:#selector(function) forControlEvents:UIControlEventTouchUpInside];
you should remove these if your intent is for the UIViewController to have the function "-(void)function" and I assume this is what you meant. I'm assuming that your "function" is supposed to be called in your UIViewController
for out purposes here, this:
[[bView btn] addTarget:self action:#selector(function) forControlEvents:UIControlEventTouchUpInside];
is the same thing as this:
[bView.btn addTarget:self action:#selector(function) forControlEvents:UIControlEventTouchUpInside];
and
bView.btn = #property (nonatomic,readonly) UIButton *btn;
In fact, you don't need to call this button in any UIView, given what you are showing, just call this in your viewDidLoad, like this:
-(void)viewDidLoad
{
[super viewDidLoad];
UIButton * btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
UIImage *btnimg = [UIImage imageNamed:#"btn.png"];
[btn setBackgroundImage:btnimg forState:UIControlStateNormal];
btn.frame = CGRectMake(65, 380, 60, 60);
btn.userInteractionEnabled = YES;
[self.view addSubview:btn];
[btn addTarget:self action:#selector(function) forControlEvents:UIControlEventTouchUpInside];
}
I'm showing you this because you aren't setting up the UIView correctly in the first place by invoking super on it's designated initializer so the best bet now is to just place the button in your viewDidLoad and move on, this is the solution until you understand how the initialize a UIView and set it up correctly. There's a lot of stuff that is wrong with the UIView you have set up and tried to subclass and it's going to be easier for you to just make the button in viewDidLoad and then learn how to subclass correctly in the future.
It seems like such a simple thing to remove a button from a view, but it is not working.
MyViewController.h
#import <UIKit/UIKit.h>
#interface MyViewController : UIViewController
#property (strong, nonatomic, readonly, getter = getMyButton) UIButton* myButton;
- (id) init;
- (id) getMyButton;
#end
MyViewController.m
#import "MyViewController.h"
#interface MyViewController ()
#end
#implementation MyViewController
#synthesize myButton = _myButton;
- (id) init
{
if([super initWithNibName: nil bundle: nil])
{
_myButton = nil;
}
return self;
}
- (id) getMyButton
{
if(!_myButton) _myButton = [self createMyButton];
return _myButton;
}
- (void) viewDidLoad
{
[super viewDidLoad];
UIButton* myButton = self.myButton;
[self.view addSubview: myButton];
}
- (void) didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (UIButton*) createMyButton
{
UIButton *button = [[UIButton alloc] init];
[button setTitle: #"My Button"
forState: UIControlStateNormal];
[button addTarget: self
action: #selector(myAction:)
forControlEvents: UIControlEventTouchUpInside];
button.frame = CGRectMake(10, 10, 100, 40);
return button;
}
- (void) myAction: (id) sender
{
[self.myButton performSelectorOnMainThread: #selector(removeFromSuperview) withObject: nil waitUntilDone: NO];
}
#end
But no luck. Clicking the button simply does nothing.
If it is not a problem of concurrency then maybe it is a memory management problem? Maybe it is just something daft, I don't know.
I tried putting the following line into the myAction method
NSLog(#"Test 1");
if(_startButton.superview) NSLog(#"Test 2");
Only 'Test 1' is logged. Perhaps that is a clue but what I don't know is why the button has no superview when it is added to view and is visible on the screen
Additional information
I don't know, if any of this is relevant, but maybe
I just updated Xcode to the latest version from the developer program (it supported up to iOS version 7.0 before, now 7.1)
I just started testing the app on an actual iPhone (I get the same problem testing with the simulator though)
Around the same time as this problem I also noticed that NSLog function doesn't work inside AppDelegate applicationHasLaunched method
Thanks
You didn't set the action for that button.
Change your createMyButton method like:
- (UIButton*) createMyButton
{
UIButton *button = [[UIButton alloc] init];
[button setTitle: #"My Button"
forState: UIControlStateNormal];
button.frame = CGRectMake(10, 10, 100, 40);
[button addTarget:self action:#selector(myAction:) forControlEvents:UIControlEventTouchUpInside];
return button;
}
Also change myAction method like:
- (void)myAction:(UIButton *)sender
{
[sender performSelectorOnMainThread: #selector(removeFromSuperview) withObject: nil waitUntilDone: NO];
}
Your code seems overly complicated:
Why do you need to lazy create the button?
Why does it need to be readonly?
Why do you need the performselector in your action?
I have taken the liberty to rewrite your code:
Header file
#property (nonatomic,strong) UIButton * button;
Code file
- (void)viewDidLoad
{
[super viewDidLoad];
self.button = [UIButton buttonWithType:UIButtonTypeSystem];
[self.button setTitle:#"MyButton" forState:UIControlStateNormal];
self.button.frame = self.view.bounds;
[self.button addTarget:self action:#selector(myAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.button];
}
-(void)myAction:(UIButton*)sender
{
[sender removeFromSuperview];
}
Happy coding!
Edit
If you insist on going with your original code, try changing
- (id) getMyButton
to
-(UIButton*)myButton
Buttons are a class family and should be created with [UIButton buttonWithType:]
I am sure that your myAction is not get fired. Cause you forget to addTarget
on your createMyButton method just add one more line
[button addTarget:self action:#selector(myAction:) forControlEvents:UIControlEventTouchUpInside];
UPDATE: You've also marked this question as iOS but you are importing OSX headers
#import "NSViewController.h"
#interface MyViewController: NSViewController
you should be inheriting from UIViewController
#import <UIKit/UIKit.h>
#interface MyViewController : UIViewController
Are you creating the view controller via the init code you've posted?
- (id) init
{
if([super initWithNibName: nil bundle: nil])
{
_myButton = nil;
}
return self;
}
Here you are not allocating anything to self the code should be
- (id) init
{
self = [super initWithNibName: nil bundle: nil];
if(self)
{
_myButton = nil;
}
return self;
}
How to enter storyboard's initial view when click the button in the scroll view.
My storyboard consists of the following:
[Navigation Controller] -> [TableView Controller] -> [DetailView Controller]
My code:
#import "AppDelegate.h"
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window=[[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
[self GuidePage];
return YES;
}
-(void)GuidePage
{
UIScrollView *scro=[[UIScrollView alloc]initWithFrame:self.window.bounds];
scro.pagingEnabled=YES;
_currentScro=scro;
scro.scrollEnabled=YES;
scro.bounces=NO;
scro.showsHorizontalScrollIndicator=NO;;
scro.delegate=self;
UIImageView *imgView1=[[UIImageView alloc]initWithImage:[UIImage imageNamed:#"Guide1.png"]];
imgView1.frame=CGRectMake(0, 0, 320, 480);
UIImageView *imgView2=[[UIImageView alloc]initWithImage:[UIImage imageNamed:#"Guide2.png"]];
imgView2.frame=CGRectMake(320, 0, 320, 480);
UIButton *btnEnter= [[UIButton alloc] initWithFrame:CGRectMake(400, 200, 100, 100)];
[btnEnter setTitle:#"Enter" forState:UIControlStateNormal];
[scro addSubview:imgView1];
[scro addSubview:imgView2];
[scro addSubview:btnEnter];
[btnEnter addTarget:self action:#selector(gotoMainStoryboard) forControlEvents:UIControlEventTouchUpInside];
scro.contentSize=CGSizeMake(320*2, scro.frame.size.height);
UIPageControl *page=[[UIPageControl alloc]initWithFrame:CGRectMake(0, 400, 320, 20)];
page.numberOfPages=2;
_pageControl=page;
[page addTarget:self action:#selector(changeCurrentPage:) forControlEvents:UIControlEventValueChanged];
page.backgroundColor=[UIColor redColor];
page.currentPage=0;
[self.window addSubview:scro];
[self.window addSubview:page];
}
-(void) gotoMainStoryboard
{
NSLog(#"goto");
}
-(void)changeCurrentPage:(UIPageControl *)sender
{
[_currentScro setContentOffset:CGPointMake(sender.currentPage*320, 0)];
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
if ((int)scrollView.contentOffset.x%320==0) {
_pageControl.currentPage=(int)scrollView.contentOffset.x/320;
}
}
#end
In your
-(void) gotoMainStoryboard
{
[self performSegueWithIdentifier:#"segue name" sender:nil];
}
This will bring next viewcontroller on button click.
I have a grid of UIButtons. When I hit an 'edit' button, I want a delete button to appear over each of these buttons, which when pressed, deletes the button (and associated data). A bit like apple's home screen, when you hold down a button and it starts to wiggle with an X in the corner.
According to this post: Subclass UIButton to add a property I can use Associative References to add a property to each of my buttons. I've tried to add a UIButton as a property of my custom UIButton but I can't seem to get it to appear and have the feeling this isn't the right way to go. Here's my custom button main:
#import "UIButton+Property.h"
#import <objc/runtime.h>
#implementation UIButton(Property)
static char UIB_DELETEBUTTON_KEY;
#dynamic deleteButton;
- (void)setDeleteButton:(UIButton *)deleteButton {
deleteButton = [UIButton buttonWithType:UIButtonTypeInfoDark];
deleteButton.frame = CGRectMake(100, 100, 50, 50);
objc_setAssociatedObject(self, &UIB_DELETEBUTTON_KEY, deleteButton, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (UIButton *)deleteButton {
return (UIButton *)objc_getAssociatedObject(self, &UIB_DELETEBUTTON_KEY);
}
#end
And here's where I add the buttons programmatically:
//Create a custom button for each custom book doc
for (int i = 0; i < [customBookDocs count]; ++i) {
BookDoc *customBookDoc = [customBookDocs objectAtIndex:i];
NSString *bookTitle = customBookDoc.book.title;
//create a button for each book
CGRect frame = CGRectMake(xCoord, yCoord, 200, 200);
UIButton *bookButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
bookButton.bookDoc = customBookDoc;
[bookButton setFrame:frame];
[bookButton setTitle:bookTitle forState:UIControlStateNormal];
[bookButton addTarget:self action:#selector(bookButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
xCoord += 250;
[self.view addSubview:bookButton];
[self.view addSubview:bookButton.deleteButton];
}
Is there an easier more sensible way to do this? Or am I on the right track?
ORIGINAL RESPONSE BEGAN:
... Someone else may have more to say about that, but I'm not sure why you'd need to use object association here. You can certainly add another button to your button as a property using regular subclassing, which is the route that I would take. ...
EDITS BELOW:
I thought that I had subclassed a UI control directly, but I realized that I was mistaken when I went to look for the code. #Joe rightly pointed out in the comments that there are issues with directly subclassing UI controls.
I was able to implement something like the functionality you described without using Associated Objects, by creating a wrapper class to hold the button and its related delete button. It works, but it's not very flexible, so I would generally recommend #Joe's method as a better solution.
Here's the relevant code:
I threw all of the code into the appDelegate to keep it simple. I don't recommend that in real life.
AppDelegate.m:
#implementation AppDelegate
#synthesize window = _window;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.backgroundColor = [UIColor whiteColor];
UIButton *toggleDeleteButtons = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[toggleDeleteButtons setFrame:CGRectMake(20, 45, 280, 45)];
[toggleDeleteButtons setTitle:#"Toggle Delete" forState:UIControlStateNormal];
[toggleDeleteButtons addTarget:self action:#selector(toggleDeleteButtonAction) forControlEvents:UIControlEventTouchUpInside];
[[self window] addSubview:toggleDeleteButtons];
ButtonWrapper *myButtonWrapper = [[ButtonWrapper alloc] init];
[[myButtonWrapper button] setFrame:CGRectMake(20, 100, 200, 45)];
[[myButtonWrapper button] setTitle:#"This is my button" forState:UIControlStateNormal];
[[myButtonWrapper deleteButton] addTarget:self action:#selector(buttonDeleteRequested:) forControlEvents:UIControlEventTouchUpInside];
[[myButtonWrapper deleteButton] setTag:0];
[[self window] addSubview:[myButtonWrapper button]];
buttonWrapper1 = myButtonWrapper;
// Added instance called anotherButtonWrapper with tag 1, as above
// Added instance called stillAnotherButtonWrapper with tag 2, as above
[self.window makeKeyAndVisible];
return YES;
}
- (void)toggleDeleteButtonAction {
static BOOL deleteButtonsShown;
[buttonWrapper1 showDeleteButton:!deleteButtonsShown];
[buttonWrapper2 showDeleteButton:!deleteButtonsShown];
[buttonWrapper3 showDeleteButton:!deleteButtonsShown];
deleteButtonsShown = !deleteButtonsShown;
}
- (void)buttonDeleteRequested:(UIButton *)deleteButton {
// delete the specified button here
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Delete" message:[NSString stringWithFormat:#"Delete was pressed on button %i",[deleteButton tag]]delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
}
ButtonWrapper.m:
#implementation ButtonWrapper
#synthesize button;
#synthesize deleteButton;
- (ButtonWrapper *)init {
ButtonWrapper *newWrapper = [ButtonWrapper alloc];
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[myButton setFrame:CGRectZero];
UIButton *myDeleteButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[myDeleteButton setFrame:CGRectMake(0, 0, 100, 40)];
[myDeleteButton setTitle:#"Delete" forState:UIControlStateNormal];
[myDeleteButton setHidden:TRUE];
[myButton addSubview:myDeleteButton];
[newWrapper setButton:myButton];
[newWrapper setDeleteButton:myDeleteButton];
return newWrapper;
}
- (void)showDeleteButton:(BOOL)showButton {
if (showButton) {
[[self deleteButton] setHidden:FALSE];
[[self deleteButton] setEnabled:TRUE]; }
else {
[[self deleteButton] setHidden:TRUE];
[[self deleteButton] setEnabled:FALSE];
}
}
#end
This solution did not require me to implement all of the UI properties, but it did require extra work to hook up the embedded delegates, which is cumbersome. There may be a way to pass the delegates into the wrapper at initialization, but I couldn't make it work.