In .m File
#interface ReaderViewController ()
{
UIButton *button;
}
Then I create
Two buttons using the button Object
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.tag=-1;
[button addTarget:self
action:#selector(record:) forControlEvents:UIControlEventTouchUpInside];
[button setTitle:#"Rec/Stop" forState:UIControlStateNormal];
button.frame = CGRectMake(215, 110, 80, 50);
[self.view addSubview:button];
Then again I am creating one more button usingbutton object
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.tag=1;
[button addTarget:self
action:#selector(record:) forControlEvents:UIControlEventTouchUpInside];
[button setTitle:#"Rec/Stop" forState:UIControlStateNormal];
button.frame = CGRectMake(340, 110, 80, 50);
[self.view addSubview:button];
Now I want to remove both buttons from superView??
How can i do that
I've tried this it didn't work [button removeFromSuperview];
Try this:
for (UIView* subV in self.view.subviews) {
if ([subV isKindOfClass:[UIButton class]])
[subV removeFromSuperview];
}
NB: this remove all buttons into you superview
Set meaningful tag values for the buttons:
button.tag = 1000;
and
button.tag = 1001;
and then you can remove the buttons with:
[[self.view viewWithTag:1000] removeFromSuperview];
[[self.view viewWithTag:1001] removeFromSuperview];
NOTE: You don't need the instance variable button; you can simply use a local variable instead.
Related
I want to pass the tag of a uibutton when it is pressed to a designated method, but when i try this, i receive an error message. Please help.
Code:
UIButton *deleteButton = [[UIButton alloc]initWithFrame:CGRectMake(230, dateLabel.frame.origin.y, 70, 27)];
[deleteButton addTarget:self action:#selector(deleteButtonPressed:i) forControlEvents:UIControlEventTouchDown];
[deleteButton setBackgroundImage:[UIImage imageNamed:#"delete.jpg"] forState:UIControlStateNormal];
[deleteButton setTag:i];
and then
-(void)deleteButtonPressed:(int)tag
{
NSLog(#"Button Pressed");
NSLog(#"%i", tag);
}
Event handlers do not pass a tag by itself, they pass the entire button:
UIButton *deleteButton = [[UIButton alloc]initWithFrame:CGRectMake(230, dateLabel.frame.origin.y, 70, 27)];
[deleteButton addTarget:self action:#selector(deleteButtonPressed:) forControlEvents:UIControlEventTouchDown];
[deleteButton setBackgroundImage:[UIImage imageNamed:#"delete.jpg"] forState:UIControlStateNormal];
[deleteButton setTag:i];
Now you can get the tag from the button passed in like this:
-(void)deleteButtonPressed:(UIButton*)button {
NSLog(#"Button Pressed, tag=%i", button.tag);
}
You can't pass an argument in an #selector. That should just be #selector(deleteButtonPressed:).
Then in the action method:
-(void)deleteButtonPressed:(UIButton *) sender
{
NSLog(#"Button Pressed");
NSLog(#"%d", sender.tag);
}
I have created a springboard like panel containing buttons as follows:
-(void)configurePanel{
self.criteriaPanel.scrollEnabled=YES;
self.criteriaPanel=[[UIScrollView alloc] initWithFrame:CGRectMake(
0.0f,
0.0f,
[UIScreen mainScreen].bounds.size.width,
(BUTTON_HEIGHT+(3*BUTTON_Y_OFFSET))
)];
UIView *scrollViewContent=[[UIView alloc]init];
NSArray *criteriaTypeButtonTitles=[NSArray arrayWithObjects:
#"Option1",
#"Option2",
#"Option3",
#"Option4",
#"Option5",
#"Option6",
nil
];
for (int i=0; i<[criteriaTypeButtonTitles count]; i++) {
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.tag=i;
button.frame = CGRectMake(
(((BUTTON_X_OFFSET*i)+(BUTTON_WIDTH*i))+BUTTON_X_OFFSET)
, BUTTON_Y_OFFSET
, BUTTON_WIDTH
, BUTTON_HEIGHT
);
[button setTitle:[criteriaTypeButtonTitles objectAtIndex:i] forState:UIControlStateNormal];
[button setTitleColor:[UIColor blueColor] forState:UIControlStateHighlighted];
button.titleLabel.font=[UIFont systemFontOfSize:13.0f];
[button setBackgroundColor:[UIColor grayColor]];
[button.layer setCornerRadius:10.0f];
[button.layer setBorderWidth:1.0f];
[button addTarget:self action:#selector(sortByButtonTap:) forControlEvents:UIControlEventTouchDown];
[scrollViewContent addSubview:button];
}
//based upon # of buttons
self.criteriaPanel.contentSize=CGSizeMake(
(([criteriaTypeButtonTitles count]*BUTTON_WIDTH)+([criteriaTypeButtonTitles count]*BUTTON_X_OFFSET)),
(BUTTON_HEIGHT+(2*BUTTON_Y_OFFSET)));
[self.criteriaPanel addSubview:scrollViewContent];
[self.view addSubview:self.criteriaPanel];
}
The panel displays correctly and scrolls, but the tap events (sortByButtonTap:) for the buttons are never called. I suspect this is related to the buttons being contained in a view which is contained in the scrollview. After reading a number of other questions and the docs I still can't figure out what the solution should be.
EDIT:
I experimented w/ adding the buttons to the UIScrollView (self.criteriaPanel) directly and the button taps call sortByButtonTap: so it is something to do w/ the buttons being in the scrollViewContent.
You might need to set userInteractionEnabled on the containing view scrollViewContent for the button to receive touch events:
[scrollViewContent setUserInteractionEnabled:YES];
What if you try:
[button setExclusiveTouch:YES];
Buttons tend to work abnormally when they are inside a view that also handles touch events.
Follow this code for your query,
Add UIButton in Scrollview
scrollview.pagingEnabled = YES;
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake();
[button setTitle:#"X" forState:UIControlStateNormal];
[button setTitleColor:[UIColor clearColor] forState:UIControlStateNormal];
[button addTarget:self action:#selector(btnCloseClicked:withEvent:) forControlEvents:UIControlEventTouchUpInside];
[button addTarget:self action:#selector(btnCloseDraged:withEvent:) forControlEvents:UIControlEventTouchDragInside];
[button addTarget:self action:#selector(btnCloseDragedEnd:withEvent:) forControlEvents:UIControlEventTouchDragExit];
[scrollview addSubview:button];
scrollview.userInteractionEnabled = YES;
you can put this three methods of button manually.
Let me know if you still have query.
instead of:
[button addTarget:self
action:#selector(sortByButtonTap:)
forControlEvents:UIControlEventTouchDown];
try:
[button addTarget:self
action:#selector(sortByButtonTap:)
forControlEvents:UIControlEventTouchUpInside];
I think your problem is just that you set the wrong UIControlEvent to the UIButton. Change from UIControlEventTouchDown to UIControlEventTouchUpInside. If you connect a UIButton inside the Interface Builder it will always set it to this UIControlEvent:
Another reason:
Otherwise your UIScrollView controls the interactions because it needs to know if you want to scroll it. If you place UIButtons inside your UIScrollView they will be accessible but always with a little delay. This is why you should maybe change the settings for the UIScrollView:
You can disable delays content touches and UIButtons will be accessible immediately
I have 3 different UIButtons for each image grouped. I have IDs for each image. Right now, I have a special id for each image, and I set the button with that tag.
I want to change the background image of the one selected when you tap it. The problem is, is that 3 buttons have the same tag so I cannot change the right button's background image.
Here's what I have:
UIButton *likeButton = [UIButton buttonWithType:UIButtonTypeCustom];
[likeButton setBackgroundColor:[UIColor clearColor]];
[likeButton setBackgroundImage:[UIImage imageNamed:#"icon_like_button.png"] forState:UIControlStateNormal];
[likeButton setBackgroundImage:[UIImage imageNamed:#"icon_like_button_hit.png"] forState:UIControlStateSelected];
[likeButton setBackgroundImage:[UIImage imageNamed:#"icon_like_button_hit.png"] forState:UIControlStateHighlighted];
[likeButton setBackgroundImage:[UIImage imageNamed:#"icon_like_button_hit.png"] forState:UIControlStateDisabled];
[likeButton setFrame:CGRectMake(13, 52 + (285 * count), 51, 55)];
[likeButton addTarget:self action:#selector(likeDudle:) forControlEvents:UIControlEventTouchDown];
[likeButton setTag:theIdInt];
[likeButton setTitle:#"no_like" forState:UIControlStateNormal];
[scrollView addSubview:likeButton];
- (IBAction)likeDudle: (id)sender {
NSInteger tagId = ((UIControl*)sender).tag;
UIButton *tempButton = (UIButton*)[scrollView viewWithTag:tagId];
NSLog(#"likeDudle: %d // %#", tagId, tempButton.titleLabel.text);
if ([tempButton.titleLabel.text isEqualToString:#"no_like"]) {
[tempButton setBackgroundImage:[UIImage imageNamed:#"icon_like_button_hit.png"] forState:UIControlStateNormal];
[tempButton setTitle:#"like" forState:UIControlStateNormal];
} else if ([tempButton.titleLabel.text isEqualToString:#"like"]) {
[tempButton setBackgroundImage:[UIImage imageNamed:#"icon_like_button.png"] forState:UIControlStateNormal];
[tempButton setTitle:#"no_like" forState:UIControlStateNormal];
}
Is there a better way in doing this?
Thanks,
Coulton
If you have fewer than 10 images, then give the ith button the tag i*10+image.tag. Then you can retrieve the image.tag by button.tag % 10 and the button tags will be unique. You can even retrieve the button only information by int b = button.tag/10.
Also, you can access the button's image's tag with button.backgroundImage.tag, so then the button could have its own separate tagging system, depending on your uses.
I've managed to create a simple rounded rect button in Xcode through code but I'm having a little trouble actually getting it to do more what I want.
Ideal situation is a custom button type with image in both states as image.png linking to a URL (say www.google.com) can anyone help me out? I presume I need to write a method to do the link. That I can handle, just not sure how to hook it up without Interface Builder (targetting iOS)
Existing Code
UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
[btn addTarget:self action:#selector(supporturl) forControlEvents:UIControlEventTouchDown];
btn.frame = CGRectMake(20, 20, 150, 50);
[btn setTitle:#"Support and Help" forState:UIControlStateNormal];
[self addSubview:btn];
UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(20.0f, 20.0f, 150.0f, 50.0f)];
[btn setTitle:#"Support and Help" forState:UIControlStateNormal];
[btn setImage:[UIImage imageNamed:#"image.png"] forState:UIControlStateNormal];
[btn addTarget:self action:#selector(openWebPage) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
[btn release];
and in function
-(void) openWebPage
{
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:#"http://www.google.com"]];
}
I'm attempting to create a view with two UIButtons. The code compiles without any error but the buttons don't have any labels and they can't be clicked.
-(id)initWithTabBar {
if ([self init]) {
self.title = #"Tab1";
self.tabBarItem.image = [UIImage imageNamed:#"promoters.png"];
self.navigationItem.title = #"Nav 1";
}
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button setTitle:#"Button" forState:UIControlStateNormal];
[button addTarget:self action:#selector(facebookAuthorize) forControlEvents:UIControlEventTouchDown];
[button setFrame:CGRectMake(10, 10, 100, 100)];
[self.view addSubview:button];
[button release];
UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button2 setTitle:#"Button" forState:UIControlStateNormal];
[button2 addTarget:self action:#selector(facebookLogin) forControlEvents:UIControlEventTouchDown];
[button2 setFrame:CGRectMake(110, 10, 100, 100)];
[self.view addSubview:button2];
[button2 release];
return self;
}
Don't release those buttons. They are created as autoreleased objects. As described in documentation:
You only release or autorelease
objects you own. You take ownership of
an object if you create it using a
method whose name begins with “alloc”,
“new”, “copy”, or “mutableCopy”
None of these words appear in buttonWithType:, so you don't take responsibility and you are safe to assume it's autoreleased.
As mentioned earlier, the buttons cant be named when it is withType. The code to make the words appear in the uibutton is:
UIButton *someButton=[[[UIButton alloc]initWithFrame:CGRectMake(140, 6, 175, 36)]autorelease];
[someButton addTarget:self action:#selector(facebookLogin) forControlEvents:UIControlEventTouchDown];
[someButton setTitle:#"Button" forState:UIControlStateNormal];
[self.view addSubview:someButton];