Scrolling UIScrollView on external screen attached to an iPad - ipad

Question

Hey. I've achieved making a programmatic UIScrollView with zooming, but now I've been trying to take the scrollable/zoomable image to an external screen if plugged in.
#implementation MapVC
UIScrollView *mapScrollView;
UIImageView *mapImageView;
UIImageView *mapImageViewEx;
CGFloat lastScale = 0;
NSMutableArray *map_List;
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
mainMenuAppDelegate *del = (mainMenuAppDelegate *)[[UIApplication sharedApplication] delegate];
map_List = [[NSMutableArray alloc] init];
[map_List addObject:#"Pacific_Map.png"];
[map_List addObject:#"Atlantic_Map.png"];
CGRect mapScrollViewFrame = CGRectMake(0, 0, 1024, 768);
mapScrollView = [[UIScrollView alloc] initWithFrame:mapScrollViewFrame];
mapScrollView.backgroundColor = [UIColor blackColor];
[mapScrollView setDelegate:(id<UIScrollViewDelegate>)self];
mapScrollView.contentSize = CGSizeMake(2437, 1536);
mapScrollView.bounces = NO;
mapScrollView.bouncesZoom = NO;
mapScrollView.minimumZoomScale = .5;
mapScrollView.maximumZoomScale = 1.5;
[mapScrollView setZoomScale:mapScrollView.minimumZoomScale];
UIImage *mapImage = [UIImage imageNamed:[map_List objectAtIndex:mapNum]];
mapImageView = [[UIImageView alloc] initWithImage: mapImage];
[mapImage release];
if(exScreenEnabled==1){
UIImage *mapImageEx = [UIImage imageNamed:[map_List objectAtIndex:mapNum]];
mapImageViewEx = [[UIImageView alloc] initWithImage: mapImageEx];
[mapImageEx release];
UIView *containerExViewP = (UIView*)[del.switchExVC.view viewWithTag:9000];
[containerExViewP addSubview:mapImageViewEx];
}else{
[mapScrollView addSubview:mapImageView];
}
[self addSubview:mapScrollView];
mapImageView.userInteractionEnabled = YES;
UIImage *footerMapIMG = [UIImage imageNamed:#"footer_map_alternate.png"];
UIImageView *footerMapView = [[UIImageView alloc] initWithImage:(UIImage *)footerMapIMG];
CGRect footerMapFrame = CGRectMake(0, 686, 213, 82);
footerMapView.frame = footerMapFrame;
[self addSubview:footerMapView];
footerMapView.image = footerMapIMG;
[footerMapView release];
CGRect backBTNFrame = CGRectMake(20, 714, 140, 52);
UIButton *MAP_backButton = [[UIButton alloc] init];
MAP_backButton.frame = backBTNFrame;
UIImage *MAP_backButtonIMG = [UIImage imageNamed:#"button_back.png"];
[MAP_backButton setImage:MAP_backButtonIMG forState:UIControlStateNormal];
MAP_backButton.backgroundColor = [UIColor clearColor];
[self addSubview:MAP_backButton];
[MAP_backButton release];
[MAP_backButton addTarget:del.switchVC
action:#selector(gotoMapAndListChooser)
forControlEvents:UIControlEventTouchUpInside];
}
return self;
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
if(exScreenEnabled==1){
return mapImageViewEx;
}else{
return mapImageView;
}
}
(Sorry I've had no luck getting that formatted to look right on this site)
If a video cable is plugged into an iPad, there's no image on the iPad, which is what I want. The image on the external screen zooms correctly when you do the gesture on the iPad, but I can't figure out how to make it scroll. Thanks in advance.
edit: I now have this -
#implementation MapVC
UIScrollView *mapScrollView;
UIImageView *mapImageView;
UIImageView *mapImageViewEx;
CGFloat lastScale = 0;
NSMutableArray *map_List;
int touchesNum = 0;
-(void)touchesBegan:(NSSet *)theTouches withEvent:(UIEvent *)event {
NSSet *touches = [event allTouches];
touchesNum=[touches count];
NSLog(#"number of touches %i", touchesNum);
}
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
mainMenuAppDelegate *del = (mainMenuAppDelegate *)[[UIApplication sharedApplication] delegate];
map_List = [[NSMutableArray alloc] init];
[map_List addObject:#"Pacific_Map.png"];
[map_List addObject:#"Atlantic_Map.png"];
CGRect mapScrollViewFrame = CGRectMake(0, 0, 1024, 768);
mapScrollView = [[UIScrollView alloc] initWithFrame:mapScrollViewFrame];
mapScrollView.backgroundColor = [UIColor blackColor];
[mapScrollView setDelegate:(id<UIScrollViewDelegate>)self];
mapScrollView.contentSize = CGSizeMake(2437, 1536);
mapScrollView.bounces = NO;
mapScrollView.bouncesZoom = NO;
mapScrollView.minimumZoomScale = .5;
mapScrollView.maximumZoomScale = 1.5;
[mapScrollView setZoomScale:mapScrollView.minimumZoomScale];
UIImage *mapImage = [UIImage imageNamed:[map_List objectAtIndex:mapNum]];
mapImageView = [[UIImageView alloc] initWithImage: mapImage];
[mapImage release];
if(exScreenEnabled==1){
UIImage *mapImageEx = [UIImage imageNamed:[map_List objectAtIndex:mapNum]];
mapImageViewEx = [[UIImageView alloc] initWithImage: mapImageEx];
[mapImageEx release];
UIView *containerExViewP = (UIView*)[del.switchExVC.view viewWithTag:9000];
[containerExViewP addSubview:mapImageViewEx];
}else{
[mapScrollView addSubview:mapImageView];
}
[self addSubview:mapScrollView];
mapImageView.userInteractionEnabled = YES;
UIImage *footerMapIMG = [UIImage imageNamed:#"footer_map_alternate.png"];
UIImageView *footerMapView = [[UIImageView alloc] initWithImage:(UIImage *)footerMapIMG];
CGRect footerMapFrame = CGRectMake(0, 686, 213, 82);
footerMapView.frame = footerMapFrame;
[self addSubview:footerMapView];
footerMapView.image = footerMapIMG;
[footerMapView release];
CGRect backBTNFrame = CGRectMake(20, 714, 140, 52);
UIButton *MAP_backButton = [[UIButton alloc] init];
MAP_backButton.frame = backBTNFrame;
UIImage *MAP_backButtonIMG = [UIImage imageNamed:#"button_back.png"];
[MAP_backButton setImage:MAP_backButtonIMG forState:UIControlStateNormal];
MAP_backButton.backgroundColor = [UIColor clearColor];
[self addSubview:MAP_backButton];
[MAP_backButton release];
[MAP_backButton addTarget:del.switchVC
action:#selector(gotoMapAndListChooser)
forControlEvents:UIControlEventTouchUpInside];
mapScrollView.multipleTouchEnabled = YES;
}
return self;
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
if(exScreenEnabled==1){
return mapImageViewEx;
}else{
return mapImageView;
}
}
- (void)scrollViewDidScroll:(UIScrollView *)inscrollView{
if(touchesNum==0){
CGPoint p = mapScrollView.contentOffset;
mapImageViewEx.frame = CGRectMake((p.x*-1), (p.y*-1), mapImageViewEx.frame.size.width, mapImageViewEx.frame.size.height);
}
}
- (void)dealloc {
[mapScrollView release];
[mapImageView release];
[map_List release];
[super dealloc];
}
#end
As I said below, I can now get either scroll or zooming to work separately, but zooming is all messed up if scrolling is working, because when zooming it thinks it's also scrolling. So I want to avoid it scrolling when zooming, and to do this I want to detect the number of touches, which I must be doing wrong!

Answer 1

Got it working with the image being on the iPad and external screen. I'll probably swap it in with a rectangular area because the image is resource heavy to be both the iPad and external screen.
#import "exGlobal.h"
#import "mapVC.h"
#import "switchVC.h"
#import "switchExVC.h"
#import "mainMenuAppDelegate.h"
#import <MobileCoreServices/MobileCoreServices.h>
#implementation MapVC
UIScrollView *mapScrollView;
UIImageView *mapImageView;
UIImageView *mapImageViewEx;
CGFloat lastScale = 0;
NSMutableArray *map_List;
static int toggleScroll = 1;
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
mainMenuAppDelegate *del = (mainMenuAppDelegate *)[[UIApplication sharedApplication] delegate];
map_List = [[NSMutableArray alloc] init];
[map_List addObject:#"Pacific_Map.png"];
[map_List addObject:#"Atlantic_Map.png"];
CGRect mapScrollViewFrame = CGRectMake(0, 0, 1024, 768);
mapScrollView = [[UIScrollView alloc] initWithFrame:mapScrollViewFrame];
mapScrollView.backgroundColor = [UIColor blackColor];
[mapScrollView setDelegate:(id<UIScrollViewDelegate>)self];
mapScrollView.contentSize = CGSizeMake(2437, 1536);
mapScrollView.bounces = NO;
mapScrollView.bouncesZoom = NO;
mapScrollView.minimumZoomScale = .5;
mapScrollView.maximumZoomScale = 1.5;
[mapScrollView setZoomScale:mapScrollView.minimumZoomScale];
UIImage *mapImage = [UIImage imageNamed:[map_List objectAtIndex:mapNum]];
mapImageView = [[UIImageView alloc] initWithImage: mapImage];
[mapImage release];
if(exScreenEnabled==1){
UIImage *mapImageEx = [UIImage imageNamed:[map_List objectAtIndex:mapNum]];
mapImageViewEx = [[UIImageView alloc] initWithImage: mapImageEx];
[mapImageEx release];
UIView *containerExViewP = (UIView*)[del.switchExVC.view viewWithTag:9000];
[containerExViewP addSubview:mapImageViewEx];
[mapScrollView addSubview:mapImageView]; // see if this works ok on iPad. Map on TV AND iPad.
}else{
[mapScrollView addSubview:mapImageView];
}
[self addSubview:mapScrollView];
mapImageView.userInteractionEnabled = YES;
UIImage *footerMapIMG = [UIImage imageNamed:#"footer_map_alternate.png"];
UIImageView *footerMapView = [[UIImageView alloc] initWithImage:(UIImage *)footerMapIMG];
CGRect footerMapFrame = CGRectMake(0, 686, 213, 82);
footerMapView.frame = footerMapFrame;
[self addSubview:footerMapView];
footerMapView.image = footerMapIMG;
[footerMapView release];
CGRect backBTNFrame = CGRectMake(20, 714, 140, 52);
UIButton *MAP_backButton = [[UIButton alloc] init];
MAP_backButton.frame = backBTNFrame;
UIImage *MAP_backButtonIMG = [UIImage imageNamed:#"button_back.png"];
[MAP_backButton setImage:MAP_backButtonIMG forState:UIControlStateNormal];
MAP_backButton.backgroundColor = [UIColor clearColor];
[self addSubview:MAP_backButton];
[MAP_backButton release];
[MAP_backButton addTarget:del.switchVC
action:#selector(gotoMapAndListChooser)
forControlEvents:UIControlEventTouchUpInside];
mapScrollView.multipleTouchEnabled = YES;
}
return self;
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
return mapImageView;
}
-(void)scrollViewDidZoom:(UIScrollView *)scrollView {
if(exScreenEnabled==1){
CGPoint p = mapScrollView.contentOffset;
mapImageViewEx.frame = CGRectMake((p.x*-1), (p.y*-1), mapImageView.frame.size.width, mapImageView.frame.size.height);
}
}
- (void)scrollViewDidScroll:(UIScrollView *)inscrollView{
if(exScreenEnabled==1 && toggleScroll==1){
CGPoint p = mapScrollView.contentOffset;
mapImageViewEx.frame = CGRectMake((p.x*-1), (p.y*-1), mapImageView.frame.size.width, mapImageView.frame.size.height);
}
}
- (void)scrollViewWillBeginZooming:(UIScrollView *)theScrollView withView:(UIView *)view{
NSLog(#"BEGIN ZOOMING");
toggleScroll=0;
}
- (void)scrollViewDidEndZooming:(UIScrollView *)theScrollView withView:(UIView *)view atScale:(float)scale{
NSLog(#"END ZOOMING");
toggleScroll=1;
}
- (void)dealloc {
[mapScrollView release];
[mapImageView release];
[map_List release];
[super dealloc];
}
#end
I pressed the space bar (4) times for code, and NOPE doesn't work stack overflow still broken. :)