I have created a UIScrollView and am now trying to place a UIButton over the scroll view. However when I build and run the application the scroll view still works fine but I cannot see the UIButton.
I link the UIButton IBOutlet inside the interface builder.
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
scrollView = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
scrollView.backgroundColor = [UIColor blackColor];
scrollView.delegate = self;
scrollView.bounces = NO;
backgroundImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"auckland-300.jpg"]];
image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"249a-134206f1d00-1342071f5d9.ImgPlayerAUCKLAND.png"]];
// Note here you should size the container view appropriately and layout backgroundImage and image accordingly.
containerView = [[UIView alloc] initWithFrame:CGRectMake(0,0,601,601)];
playButton = [[UIButton alloc] init]; //test button cannot see it.
[containerView addSubview:backgroundImage];
[containerView addSubview:image];
scrollView.contentSize = containerView.frame.size;
[scrollView addSubview:containerView];
scrollView.minimumZoomScale = 0.5;
scrollView.maximumZoomScale = 31.0;
[scrollView setZoomScale:scrollView.minimumZoomScale];
self.view = scrollView;
}
Any help would be appreciated
Everything seems ok. But I think the reason you are not able to see the button playButton is because you are not adding it to the view itself.
Dont you need to do this ? [containerView addSubview:playButton];
To help you out, here's what I do for debugging -
UIView implements a useful description method. In addition, it
implements a recursiveDescription method that you can call to get a
summary of an entire view hierarchy.
NSLog(#"%#", [controller.view recursiveDescription]);
The button is probably in the nib that you linked the controllers view to, right? By assigning the scrollview to the view, you remove the view from
The nib from the controller, that's why you can't see te button or press it.
You can either place the button in the scrollview or you add both scrollView and thenthe playButton as subviews of self.view.
Maybe you want to rethink your design tho.
Placing a button over a scrollview doesn't really seem like good practice to me.
Related
I have one view Controller and one UIView now in my ViewController when i click barButton than second view will apear like popup,now i want to add page controller and scrollview in that second view, my second view is not UIViewController but it is UIView.so how can i do that...
my first view is "ImageViewController" and second view is "PopupView"
in ImageViewController.m
#import "PopupView.h"
#implementation ImageViewController
- (void)viewDidLoad
{
UIBarButtonItem *clipArt = [[UIBarButtonItem alloc] initWithTitle:#"Clip Art"
style:UIBarButtonItemStyleBordered
target:self
action:#selector(popUpView:)];
}
- (void)popUpView:(id)sender {
CGRect * imageFrame = CGRectMake(10, 90, 300, 300);
PopupView *popUpView = [[PopupView alloc] initWithFrame:imageFrame];
[self.view addSubview:popUpView];
}
And in PopupView.m
- (id)initWithFrame:(CGRect)frame
{
if (self) {
CGRect * imageFrame = CGRectMake(0, 0, 300, 300);
self = [super initWithFrame:frame];
UIImageView *starImgView = [[UIImageView alloc] initWithFrame:imageFrame]; //create ImageView
starImgView.alpha =0.8;
starImgView.layer.cornerRadius = 15;
starImgView.layer.masksToBounds = YES;
starImgView.image = [UIImage imageNamed:#"black"];
[self addSubview:starImgView];
self.backgroundColor = [UIColor clearColor];
}
return self;
}
Implement like this in the second view, for scroll view with page control (this example illustrates the scenario for two views):
CGRect scrollViewFrame = CGRectMake(ur dimensions for scroll view);
UIScrollView *myScrollView = [[UIScrollView alloc] initWithFrame:scrollViewFrame];
myScrollView.pagingEnabled = YES;
myScrollView.contentSize = CGSizeMake(scrollViewFrame.size.width * 2, scrollViewFrame.size.height);
//content size is the actual size of the content to be displayed in the scroll view.
//Since, here we want to add two views so multiplied the width by two.
CGRect viewFrame = [myScrollView bounds];
UIView *view1 = [[UIView alloc] initWithFrame:viewFrame];
viewFrame.origin.x = viewFrame.size.width; //setting the offset so that view2 is next to view 1
UIView *view2 = [[UIView alloc] initWithFrame:viewFrame];
//add both the view to scroll view
[myScrollView addSubview:view1];
[myScrollView addSubview:view2];
//add scroll view to parent view
[self addSubview:myScrollView];
You can replace the view1/2 with any visual element. To have scrolling with page control make sure all the view that you want to add to scrollview are so same width/height. That way it work out of the box and you wont have to do anything. Also, its always a good idea to add UIPageControl to the view for giving user some kind of feedback. Its optional though.
One more thing, if you want horizontal scrolling with page control, increase the width as done above. If you want vertical scrolling, increase the height and keep the width same.
I have a full screen UIScrollView to display my image. An UIActivityIndicatorView is added to the UIScrollView, it spinning well, but how could i make it always spinning in the middle of the screen while I am scrolling, zooming, rotating?
If you add the UIActivityIndicatorView directly to the scroll view it will scroll with the scroll view. But, if you add it to the parent of the scroll view it will remain where it was placed. So, the solution is to add it to the parent of the scroll view.
Notes:
I would recommend having a UIViewController in your window, and then adding these both to the UIViewController.
See the discussion here about adding views directly to your window:
View Controller being sent a message even though it has been deallocated
In ur .h file
UIView *primaryImage;
UIView *secondaryImage;
UIActivityIndicatorView *indicator;
In ur .m file
-(void)indicatorView
{
primaryImage = [[UIView alloc] initWithFrame:CGRectMake(0,0,320,480)];
primaryImage.backgroundColor = [UIColor blackColor];
primaryImage.alpha =0.5;
//[self.view.superview insertSubview:primaryImage aboveSubview:self.view.superview];
//[theTableView addSubview:primaryImage];
[self.view addSubview:primaryImage];
secondaryImage = [[UIView alloc] initWithFrame:CGRectMake(127.50,215,65,50)];
secondaryImage.backgroundColor = [UIColor blackColor];
secondaryImage.alpha = 0.9;
secondaryImage.layer.cornerRadius = 12;
[primaryImage addSubview:secondaryImage];
indicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(30, 25, 25, 25)];
indicator.center = CGPointMake(32, 25);
//[indicator hidesWhenStopped];
[indicator startAnimating];
[secondaryImage addSubview:indicator];
}
-(void)dismissCoverImageView {
[indicator stopAnimating];
[indicator removeFromSuperview];
[secondaryImage removeFromSuperview];
[primaryImage removeFromSuperview];
}
and after that you can call [self indicatorView];
and [self dismissCoverImageView];
Define the UIScrollViewDelegate of your UIScrollView. And in the delegate method –(void)scrollViewDidScroll:(UIScrollView *)scrollView change the frame of UIActivityIndicator object.
I have a question regarding the implementation of loadView:
Right now, I have it like this:
- (void)loadView
{
image = [UIImage imageNamed:#"plan.gif"];
scrollView=[[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
imageView = [[UIImageView alloc] initWithFrame:
CGRectMake(0, 0,scrollView.frame.size.width + 40, scrollView.frame.size.height)];
imageView.image = image;
[imageView setContentMode:UIViewContentModeCenter];
scrollView.contentSize = image.size;
scrollView.maximumZoomScale = 3.0;
scrollView.bounces = NO;
scrollView.delegate = self;
// do any further configuration to the scroll view
// add a view, or views, as a subview of the scroll view.
[scrollView addSubview:imageView];
// release scrollView as self.view retains it
self.view=scrollView;
[scrollView release];
}
I suppose some of it should be in viewDidLoad:?
Thanks in advance.
This seems fine to me.
viewDidLoad is normally used as your hook after getting a view returned from IB. In this case you are essentially just doing the work of IB in code (setting up the view heirachy and configuring it).
Therefore in this case I think splitting out the logic may be superfluous unless it makes your code more readable.
I have a 320x460 view with a number of buttons, depending on the button pressed, a 280x280 view pops up over the 320x460 view (similar to the behavior of the UIAlertView) using code like this:
UIView *overlayView = [[UIView alloc] initWithFrame:CGRectMake(20, 200, 280, 280)];
overlayView.backgroundColor = [UIColor whiteColor];
[overlayView autorelease];
[overlayView addSubview:label]; // label declared elsewhere
[overlayView addSubview:backgroundImage]; // backgroundImage declared elsewhere
//... Add a bunch of other controls
[label release];
[backgroundImage release];
//... Release a bunch of other controls
[self.view addSubview:overlayView];
Everything works fine displaying the overlayView and all its controls.
The question I have is, how do I get rid of the overlayView once it's displayed? I want to make it not only not visible but to remove it completely, since the user will be popping up the overlayView repeatedly during use.
You need access to overlayView to remove it, I'd suggest adding this to the create side:
overlayView.tag = 5; // Or some other non-zero number
Then later you can use it like this:
-(void)removeOverlayView
{
UIView *overlayView = [self.view viewWithTag:5];
[overlayView removeFromSuperview];
}
I'd like to place an image behind the tableView in my UITabBarController moreNavigationController. I have tried inserting a subview like so when first setting up the TabBar:
UIImageView* imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"background3.png"]];
[self.tabBarController.moreNavigationController.topViewController.view insertSubview:imageView atIndex:0];
But this places the image over the top, presumably because the tableView isn't there at the time. Is there a better time when I can call this in order to have it work properly, or an easier approach?
With some assistance from this question, I figured out how to do this. Basically, the viewController in the moreNavigationController is a single TableView, so adding a background image won't work. What I need to do was to create a new view, add the background image, and then add the moreNavigationController view on top of that. I did this by overriding viewDidLoad in a subclass of UITabBarController, but I expect it could be done elsewhere as well.
- (void)viewDidLoad {
[super viewDidLoad];
UINavigationController *moreController = self.moreNavigationController;
if ([moreController.topViewController.view isKindOfClass:[UITableView class]]) {
UIView* newView = [[UIView alloc] initWithFrame:CGRectMake(0,0,320,367)];
UIImageView* imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"background3.png"]];
imageView.opaque = NO;
imageView.alpha = 0.4;
[newView addSubview:imageView];
moreController.topViewController.view.backgroundColor = [UIColor clearColor];
moreController.topViewController.view.frame = CGRectMake(0,0,320,367);
[newView addSubview:moreController.topViewController.view];
moreController.topViewController.view = newView;
}
}
You could probably be smarter with the frame sizes, etc, but this works for me. Hopefully it helps someone else too.
Now you can acess backgroundView property from UITableView subclasses .
UIViewController *moreViewController = tabBarController.moreNavigationController.topViewController;
img = [[UIImageView alloc]initWithImage:[UIImage imageNamed:#"BG_MORE+1.png"]];
//Got some crashs in initialization !! Need to check .
if ([moreViewController.view isKindOfClass:[UITableView class]]) {
UITableView *moreTableView = (UITableView*)moreViewController.view;
[moreTableView setBackgroundView:img];
}
Besides all the dotty mess here, you can use UIView's bringSubviewToFront: and sendSubviewToBack: to organize your subviews. Basically this should help, although if you have more subviews you will need to play around with it a little bit:
[self.tabBarController.moreNavigationController.topViewController.view addSubview:imageView];
[self.tabBarController.moreNavigationController.topViewController.view pushSubviewToBack:imageView];
//or [self.tabBarController.moreNavigationController.topViewController.view bringSubviewToFront:tableView];