i have button on the view and call following void to open popover controller with image picker, no problem here popover come up with image picker etc.
when i create UIButton programmatically on viewDidLoad the buttons calls same void below however this time that throws an exception "Popovers cannot be presented from a view which does not have a window."
-(IBAction)pickupPhoto:(id)sender
{
CGRect rect = CGRectMake(100, 100, 1, 1); // [(UIScrollView *)sender frame];
self.imgPicker = [[UIImagePickerController alloc] init];
self.imgPicker.delegate = self;
self.imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
self.popOver = [[UIPopoverController alloc] initWithContentViewController:imgPicker];
[popOver setDelegate:self];
[popOver presentPopoverFromRect:rect inView:[self view] permittedArrowDirections:UIPopoverArrowDirectionUp animated:NO];
[imgPicker release];
}
here i am creating buttons on same view buttons call the void.
-(void)addButtons
{
for (int i = 0; i < 10; i++) {
self.btn = [[UIButton alloc] initWithFrame:CGRectMake(i * 100, 0, 100, 80)];
[[self.btn layer] setBorderColor:RGB(245, 245, 245).CGColor];
[[self.btn layer] setBorderWidth:1.0f];
[[self.btn titleLabel] setFont:[UIFont fontWithName:#"Thonburi" size:70]];
[self.btn setTitle:doubleToString(i+1) forState:UIControlStateNormal];
[self.btn setTitleColor:RGB(245, 245, 245) forState:UIControlStateNormal];
[self.btn setTitle:doubleToString(i+1) forState:UIControlStateSelected];
[self.btn setTitleColor:RGB(125, 225, 225) forState:UIControlStateHighlighted];
[self.btn addTarget:[NMBPostUI alloc] action:#selector(pickupPhoto:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
[btn release];
}
}
i can see when i call -(void)addButtons, self.view.window returns nil for the buttons created at runtime that causes the problem. yes i should create buttons during init but there is no init call when you call view controller as -storyBoard- Page Sheet. how can i walk around this?
any ideas are welcome.
many thanks.
Try creating buttons in:
initWithNibName:bundle:
or
awakeFromNib
methods. Maybe this will work.
Related
I ve got a view controller . when i pass an extra object I m getting this error #No visible interface in the below function .could u help me out.below is the code.where i am passing an object of type photo ..
ItemImageView *itemImage = [[ItemImageView alloc]initWithFrame:CGRectMake(currentPhotoPositionX,0,pageButtonWidth,pageButtonHeight) andPhoto:photo];
#ItemImageview
- (id)initWithFrame:(CGRect)frame :andPhoto:(Photo *)photo
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
//Create Activity Indicator
activityIndicator= [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(225, 115, 30, 30)];
[activityIndicator setBackgroundColor:[UIColor clearColor]];
[activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];
[self addSubview:activityIndicator];
//Create Label Comments
lblComments = [[UILabel alloc] initWithFrame:CGRectMake(30.0f, 100.0f, 60.0f, 43.0f)];
[lblComments setText:#"Comments"];
[lblComments setBackgroundColor:[UIColor clearColor]];
[self addSubview:lblComments];
//Create Label Likes
lblLikes = [[UILabel alloc] initWithFrame:CGRectMake(100.0f, 100.0f, 60.0f, 43.0f)];
[lblLikes setText:#"Likes"];
[lblLikes setBackgroundColor:[UIColor clearColor]];
[self addSubview:lblLikes];
//Create Item Button
btnItem = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btnItem addTarget:self
action:#selector(:)
forControlEvents:UIControlEventTouchUpInside];
[btnItem setBackgroundImage:[UIImage imageNamed:#"1.png"] forState:UIControlStateNormal];
btnItem.frame = CGRectMake(0.0f, 0.0f, 144.0f, 143.0f);
[self addSubview:btnItem];
}
return self;
}
Change it into:
- (id)initWithFrame:(CGRect)frame andPhoto:(Photo *)photo
And also remember to add it to your .h file.
I want to have a back button when I go to another view controller but I have not been able to achieve this. I have tried to set the back button to not hidden with no luck. A little background information, there is no navigation controller being loaded when the app starts, I'am trying to go through one uiviewcontroller to another.
Here is how I have tried to achieve this, if anyone can tell what is wrong... it would be appreciated!
displayViewController *controller = [[displayViewController alloc] initWithNibName:#"displayViewController" bundle:nil];
UINavigationController *aNavController = [[UINavigationController alloc] initWithRootViewController:controller];
[self presentModalViewController:aNavController animated:YES];
[aNavController release];
[controller release];
You can put the back button in the viewController in which you want to have the back button
- (void)viewDidLoad
{
// back button
UIImage* image = [UIImage imageNamed:#"back.png"];
CGRect frame = CGRectMake(0, 0, image.size.width, image.size.height);
UIButton *backButton = [[UIButton alloc] initWithFrame:frame];
[backButton setBackgroundImage:image forState:UIControlStateNormal];
[backButton addTarget:self action:#selector(backAction:) forControlEvents:UIControlStateHighlighted];
UIBarButtonItem* backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = backButtonItem;
[backButtonItem release];
[backButton release];
}
-(void) backAction:(id)sender
{
[self.navigationController popViewControllerAnimated:YES];
}
I try to create a view without IB and make it separated with its controller. The view is MediaPlayerView contains two buttons and the controller is MediaPlayerViewController. I called the view in controller and adding a Movie Player view in it. The buttons is showing but the movie view just dark screen. What's wrong with my code?
Here is my code:
MediaPlayerView.m
-(id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
// Initialization code
UIButton *audioFileButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
UIButton *shortSoundButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[audioFileButton setFrame:CGRectMake(0, 40, 150, 40)];
[shortSoundButton setFrame:CGRectMake(0, 100, 200, 40)];
[audioFileButton setTitle:#"Play Audio File" forState:UIControlStateNormal];
[shortSoundButton setTitle:#"Play Short Sound" forState:UIControlStateNormal];
_viewController = [[MediaPlayerViewController alloc] init];
[audioFileButton addTarget:[self viewController]
action:#selector(playAudioFile:)
forControlEvents:UIControlEventTouchUpInside];
[shortSoundButton addTarget:[self viewController]
action:#selector(playShortSound:)
forControlEvents:UIControlEventTouchUpInside];
[self addSubview:audioFileButton];
[self addSubview:shortSoundButton];
}
return self;
}
In MediaPlayerViewController.m, here is my loadView and viewDidLoad:
loadView:
MediaPlayerView *mPlayer = [[MediaPlayerView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[mPlayer setBackgroundColor:[UIColor clearColor]];
[self setView:mPlayer];
[mPlayer release];
viewDidLoad:
[super viewDidLoad];
float halfHeight = [[self view] bounds].size.height / 2.0;
float width = [[self view] bounds].size.width;
[[[self moviePlayer] view] setFrame:CGRectMake(0, halfHeight, width, halfHeight)];
[[self view] addSubview:[[self moviePlayer] view]];
Forgive for my bad writing, cause I am a newbie either in here, Objective-C or english.
I've found a lot of information on autoresizing but none has been able to solve my problem. I have a ViewController (RAViewController) who calls a view in its loadView method like so:
- (void)loadView
{
// Set Navigation Bar Title
self.navigationItem.title = #"RA";
// Add Background view
self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Add RAView
RAView *rAView = [[RAView alloc] initWithFrame:self.view.frame Controller:self];
[self.view rAView];
}
The view it calls (RAView) looks like this:
- (id)initWithFrame:(CGRect)frame Controller:(RAViewController *)Controller
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.autoresizesSubviews = YES;
self.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.backgroundColor = [[UIColor alloc] initWithRed:1.0 green:1.0 blue:1.0 alpha:1.0];
controller = Controller;
// Draw Architecture View
[self drawArchitectureView];
}
return self;
}
-(void)drawArchitectureView {
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(10, 10, self.frame.size.width - 20, 50);
[button setBackgroundColor:[UIColor grayColor]];
[button setTitle:#"Overview" forState:UIControlStateNormal];
[self addSubview:button];
}
For some reason I can't get autoresizing mask to resize the button width when the device is landscape. Any help is greatly appreciated.
If you want it to keep the same height, but just stay fully centered, 10.0 from the left and right, try:
-(void)drawArchitectureView {
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(10, 10, self.frame.size.width - 20, 50);
button.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleRightMargin;
[button setBackgroundColor:[UIColor grayColor]];
[button setTitle:#"Overview" forState:UIControlStateNormal];
[self addSubview:button];
}
I want to disabled the default back button of navigation controller
self.navigationItem.rightBarButtonItem.enabled = NO;
// Below code does not work since leftBarButtonItem is always nil.
self.navigationItem.leftBarButtonItem.enabled = NO;
I have done it with manually shown below, But Is there any property to disabled the default back button with just single line?
backButton = [[UIButton alloc] initWithFrame:CGRectMake(5, 5, 100, 30)];
[backButton setBackgroundImage:[UIImage imageNamed:#"backbutton_100.png"] forState:UIControlStateNormal];
[backButton addTarget:self action:#selector(backAction:) forControlEvents:UIControlEventTouchUpInside];
[backButton setTitle:#" All Customers" forState:UIControlStateNormal];
backButton.titleLabel.font = [UIFont boldSystemFontOfSize:12];
[buttonView addSubview:backButton];
UIBarButtonItem* leftButton = [[UIBarButtonItem alloc] initWithCustomView:buttonView];
self.navigationItem.leftBarButtonItem = leftButton;
[leftButton release];
// Now it is working.
self.navigationItem.leftBarButtonItem.enabled = NO;
Its very easy ..... just try this out
self.navigationController.navigationBar.userInteractionEnabled = NO; //for disabling
self.navigationController.navigationBar.userInteractionEnabled = YES; //for again enabling
Using "hidesBackButton=YES" is really not an elegant solution, cause it HIDES the button which is not what we want. An acceptable work-around would be adding a UILabel to the window just over the back button at least disabling the touches on the button.
Add this method to your AppDelegate class:
- (void) disableLeftBarButtonItemOnNavbar:(BOOL)disable
{
static UILabel *l = nil;
if (disable) {
if (l != nil)
return;
l = [[UILabel alloc] initWithFrame:CGRectMake(0, 20, 160, 44)];
l.backgroundColor = [UIColor clearColor];
l.userInteractionEnabled = YES;
[self.window addSubview:l];
}
else {
if (l == nil)
return;
[l removeFromSuperview];
[l release];
l = nil;
}
}
You can call it like this from any view controller to disable:
MyAppDelegate *appDeleg = (MyAppDelegate *) [[UIApplication sharedApplication] delegate];
[appDeleg disableLeftBarButtonItemOnNavbar:YES];
To enable:
MyAppDelegate *appDeleg = (MyAppDelegate *) [[UIApplication sharedApplication] delegate];
[appDeleg disableLeftBarButtonItemOnNavbar:NO];
Call [self.navigationItem setHidesBackButton:YES]; for the view controller you do not want to have the back button. Then set the leftBarButtonItem as normal.
You can also use
[[_navigationController.topViewController.navigationItem leftBarButtonItem] setEnabled:NO]; // The top view controller on the stack.
[[_navigationController.visibleViewController.navigationItem leftBarButtonItem] setEnabled:NO];// Return modal view controller if it exists. Otherwise the top view controller.
you can use this when you want to disable or enable UIViewControler from Appdelegate, or any other viewcontroler.