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stuffradio
Member
I was thinking of doing a UIScrollView with paging, but it looks hard to implement, so I wonder if a UITableView would be best. What do you guys use for your Level select?
I tried searching for UIScrollView and I saw that you have to uncomment a line in Director.m or something, just not sure what the best solution is. I also want to know something for scrolling text when I want to display lots of information. (Which would be best displayed in a scroll view).
I created my own simple version of a UIScrollView that is cocos2d friendly using nothing more than a layer. I haven't cleaned it up yet so the code is messy but it seems to work.
In a very basic nutshell, it goes a little somethin like this -
I use the following vars for tracking, declared in the header:
Layer *scrollLayer;
BOOL isDragging;
float lasty;
float yvel;
int contentHeight;And then the important bits of code that do stuff and things:
- (void) init {
// stuff snipped out
isTouchEnabled = YES;
isDragging = NO;
lasty = 0.0f;
yvel = 0.0f;
contentHeight = 800; // whatever you want here for total height
// main scrolling layer
scrollLayer = [[Layer alloc] init];
scrollLayer.anchorPoint = ccp( 0, 1 );
scrollLayer.position = ccp( 0, 320 );
[self addChild:scrollLayer];
[self schedule:@selector(moveTick:) interval:0.02f];
}
#pragma mark Scheduled Methods
- (void) moveTick: (ccTime)dt {
float friction = 0.95f;
if ( !isDragging ) {
// inertia
yvel *= friction;
CGPoint pos = scrollLayer.position;
pos.y += yvel;
pos.y = MAX( 320, pos.y );
pos.y = MIN( contentHeight + 320, pos.y );
scrollLayer.position = pos;
}
else {
yvel = ( scrollLayer.position.y - lasty ) / 2;
lasty = scrollLayer.position.y;
}
}
#pragma mark Touch Methods
// other touch events : ccTouchesBegan, ccTouchesMoved, ccTouchesEnded, ccTouchesCancelled
- (BOOL) ccTouchesBegan: (NSSet *)touches withEvent: (UIEvent *)event {
isDragging = YES;
return kEventHandled;
}
- (BOOL) ccTouchesMoved: (NSSet *)touches withEvent: (UIEvent *)event {
UITouch *touch = [touches anyObject];
// simple position update
CGPoint a = [[Director sharedDirector] convertToGL:[touch previousLocationInView:touch.view]];
CGPoint b = [[Director sharedDirector] convertToGL:[touch locationInView:touch.view]];
CGPoint nowPosition = scrollLayer.position;
nowPosition.y += ( b.y - a.y );
nowPosition.y = MAX( 320, nowPosition.y );
nowPosition.y = MIN( contentHeight + 320, nowPosition.y );
scrollLayer.position = nowPosition;
return kEventHandled;
}
- (BOOL) ccTouchesEnded: (NSSet *)touches withEvent: (UIEvent *)event {
isDragging = NO;
return kEventHandled;
}For this I simply cut off the velocity if it exceeded one of the bounds. You could easily implement "bounce-back" by just multiplying it by -1 instead.
Hope that helps =)
You mean to implement the hard stop? That's done by the MIN / MAX statements inside the tick function. Essentially it will just stop when it hits boundaries. I also have a slight modification to that code that will allow the content to bounce and reverse velocity when it reaches a boundary. If anyone is interested I can post that as well.
oscarmk
Member
Yes after implementing your code I realized that's what the MIN/MAX are for. I do notice the movement while accelerating is not as smooth as the dragging one which is perfect. Have you found a solution for this?. If you could post the code to reverse velocity when it reaches a boundary and bounce that would be great =).
Thank you exorcyze, I am replacing my UIscrollView with your Layer implementation so I can finally use Director DisplayLink Type, since I was having problems with the fps in my game, sometimes it would randomly start at 40 fps and stay there... I read in a post by riq that this could be because you have to comment the setDirectorType line in order to get a smooth movement with a UIScrollView.
Now that I can set my Director type to CCDisplayLink it is all working good thanks to you. Thank you so much for sharing your code.
Here's updated code for the tick function - simply comment / uncomment the two lines based on the behavior you want : stop or bounce. The other methods stay the same.
I'm glad you found it helpful! =)
Regarding smoothness - I haven't really seen any big difference between the dragging / decellerating - it runs for me at a smooth 60FPS on a 3G. I don't have anything else happening in the scene, just place containers for each area spaced out and a menu for the levels inside each area. After placement nothing else runs besides that code. =)
- (void) moveTick: (ccTime)dt {
float friction = 0.95f;
if ( !isDragging ) {
// inertia
yvel *= friction;
CGPoint pos = scrollLayer.position;
pos.y += yvel;
// *** CHANGE BEHAVIOR HERE *** //
// to stop at bounds
//pos.y = MAX( 320, pos.y );
//pos.y = MIN( contentHeight + 320, pos.y );
// to bounce at bounds
if ( pos.y < 320 ) { yvel *= -1; pos.y = 320; }
if ( pos.y > contentHeight + 320 ) { yvel *= -1; pos.y = contentHeight + 320; }
scrollLayer.position = pos;
}
else {
yvel = ( scrollLayer.position.y - lasty ) / 2;
lasty = scrollLayer.position.y;
}
}Exorcyze, just wanted to "Chime in" and say thank you for this as well I'm going to attempt and add this to my game now. Was looking for a way to implement the UIScrollView to add "items" to an "Upgrade Scene" where the user can obtain upgrades and scroll through them.
Thank you.
Thanks for this code to get me started. I modified it to work in LandScape mode. Additional, I have it snap to page 1 or page 2. This could of course be extended for more pages, but you get the idea. Hopefully this will help others. I really like this NON-uikit implementation for a simple scroll view.
Variables in header file of this layer page.
// scrolling
Layer * scrollLayer;
BOOL isDragging;
float lastX;
float xVel;
int contentWidth;
int currentPage;Init code
-(id) init
{
.... other code....
// SCROLLING LAYER SETUP
isTouchEnabled = YES;
isDragging = NO;
lastX = 0.0f;
xVel = 0.0f;
contentWidth = s.width * 2.0; // e.g. two pages wide
currentPage = 0;
// main scrolling layer - add as child to this page layer.
scrollLayer = [[Layer alloc] init];
scrollLayer.anchorPoint = ccp(0, 1);
scrollLayer.position = ccp(0, 0);
[self addChild:scrollLayer];
[self schedule:@selector(moveTick:) interval:0.02f];
// Here I add a two Menus to the scroll layer - a page1 menu and a page 2 menu.
// create page1 MenuItems.....
Menu * lensMenu = [Menu menuWithItems:lens0, lens3, lens6, lens1, lens4, lens7, lens2, lens5, lens8, nil];
[lensMenu alignItemsInRows: [NSNumber numberWithUnsignedInt:3], [NSNumber numberWithUnsignedInt:3], [NSNumber numberWithUnsignedInt:3], nil];
[lensMenu setPosition:ccp(s.width/2.0, s.height/2.0)];
[scrollLayer addChild: lensMenu];
// create page2 MenuItems - note, this menu is positioned off the visible page
Menu * lensMenu2 = [Menu menuWithItems:lens9, lens12, lens15, lens10, lens13, lens16, lens11, lens14, lens17, nil];
[lensMenu2 alignItemsInRows: [NSNumber numberWithUnsignedInt:3], [NSNumber numberWithUnsignedInt:3], [NSNumber numberWithUnsignedInt:3], nil];
[lensMenu2 setPosition:ccp(s.width/2.0 + s.width, s.height/2.0)];
[scrollLayer addChild: lensMenu2];
}Here is the modified movement and momentum code that also snaps to each page
- (void) moveTick: (ccTime)dt
{
float friction = 0.99f;
CGSize s = [[Director sharedDirector] winSize];
if (!isDragging)
{
// inertia
xVel *= friction;
CGPoint pos = scrollLayer.position;
pos.x += xVel;
// to stop at bounds
pos.x = MAX(-s.width, pos.x);
pos.x = MIN(0, pos.x);
if(pos.x == -s.width)
{
xVel = 0;
currentPage = 1;
}
if(pos.x == 0)
{
xVel = 0;
currentPage = 0;
}
// snap to page by quickly moving to it: e.g.: xVel = 40
if (fabsf(xVel) < 10)
{
if (pos.x < -s.width/2.0)
{
xVel = -40;
}
else {
xVel = 40;
}
}
[self setCurrentPage:currentPage];
scrollLayer.position = pos;
}
else {
xVel = (scrollLayer.position.x - lastX)/2.0;
lastX = scrollLayer.position.x;
}
}Finally, here is the modified touch code.
- (BOOL) ccTouchesBegan: (NSSet *)touches withEvent: (UIEvent *)event
{
isDragging = YES;
return kEventHandled;
}
- (BOOL) ccTouchesMoved: (NSSet *)touches withEvent: (UIEvent *)event
{
CGSize s = [[Director sharedDirector] winSize];
UITouch *touch = [touches anyObject];
// simple position update
CGPoint a = [[Director sharedDirector] convertToGL:[touch previousLocationInView:touch.view]];
CGPoint b = [[Director sharedDirector] convertToGL:[touch locationInView:touch.view]];
CGPoint nowPosition = scrollLayer.position;
nowPosition.x += (b.x - a.x);
nowPosition.x = MAX(-s.width, nowPosition.x);
nowPosition.x = MIN(0, nowPosition.x);
scrollLayer.position = nowPosition;
return kEventHandled;
}
- (BOOL) ccTouchesEnded: (NSSet *)touches withEvent: (UIEvent *)event
{
isDragging = NO;
return kEventHandled;
}Hope this helps!
mad-boy
Member
Hi,
first, thanks for this great instruction! This scroll view is great! However I have one problem and I am not quite shure how to handle this: (I am on 0.99.1)
I have some buttons in my scroll layer. (Basically a CCSprite that implements the CCTargetedTouchDelegate). Normally, these buttons would swallow the touches. If so, I can only scroll the view if I didn't put my finger on the button. If they don't swallow, I can scroll, but the button will be executed up ob touchEnd, which isn't quite nice either. So what I need would be more like 'if I am scrolling, cancel the touch for everything else that receives touches', but I am not quite shure how to do that?
Best regards,
Michael
mithril
Member
I think that's because the menu item is responding to the touch event and not sending it to the background, i.e. scrollLayer. Also, when you select a menu item and move away, I believe it cancels the action.
Any suggestions how i can modify this setup to work with pinch to zoom as well?
@mad-boy, @Macdude93, In order to allow menu items to work correctly I modified the scroll layer to take on the additional responsibilities of being a menu:
-(BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
self.selectedItem = [self itemForTouch:touch];
[self.selectedItem selected];
// Stop movement
yvel = 0;
return YES;
}
-(void) ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
{
// Set dragging to true
isDragging = YES;
// Unselect any selected menu item
[self.selectedItem unselected];
self.selectedItem = nil;
... all the good scrolling stuff ...
}
-(void) ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event
{
if(!isDragging) {
[self.selectedItem unselected];
[self.selectedItem activate];
}
isDragging = NO;
self.selectedItem = nil;
}
-(void) ccTouchCancelled:(UITouch *)touch withEvent:(UIEvent *)event
{
[self.selectedItem unselected];
self.selectedItem = nil;
isDragging = NO;
}You can find the code for itemForTouch in CCMenu.
Once you've made these changes you can just add all your menu items as children to the scroll layer directly.
The behavior is just like in mobile Safari. Touching a button selects it, but if the user starts to drag the selection is cancelled and the action is correctly interpreted as a scroll action.
@mithril I posted some unrelated code for a zoomable / pinchable layer in this topic http://www.cocos2d-iphone.org/forum/topic/5721. It is scrollable both left and right and up and down however it will just stop as opposed to decelerate when the touches end . Hope this helps!
Charybdis
Member
So, has anyone assembled all of the code here into a class file maybe they could post? I'm trying to put it all together now but I keep running across more errors, I think cocos2d has changed some since this code at the beginning was posted. Would anyone be willing to share all the assembled code?
robodude666
Member
I attempted to write a class earlier today as I needed something similar for a project. After getting a few hours into it I realized it would it wasn't going so well.
I'll be using the class posted in this thread:
http://www.cocos2d-iphone.org/forum/topic/6821
It's well written, documented, and has some examples plus lots of functionality.
robodude666
Member
Macdude93, none of the code posted in this thread is complete. You'll need to piece it together and figure out anything that was missing.
selectedItem is mostly likely a member of CCMenuItem type.
I tried putting together some of the stuff in this thread and gave up shortly after. Then, after spending a few hours writing my own class from scratch I gave up and am now using the class posted in the thread I linked to above.
robodude666
Member
For the sake of Open Source fun, below is ScrollView class I managed to put together. It's slightly based off of what was provided in this thread and works in both landscape/portrait mode. It's not complete, and is far from.
It is currently missing:
- Clipping of top/bottom.
- Clickable items
- Bunch of other stuff
But, it works for the most part...
ScrollView.h
#import "cocos2d.h"
typedef enum
{
BounceDirectionGoingUp = 1,
BounceDirectionStayingStill = 0,
BounceDirectionGoingDown = -1
} BounceDirection;
@interface ScrollView : CCColorLayer
{
BounceDirection direction;
CCLayer *scrollLayer;
BOOL isDragging;
float lasty;
float yvel;
int contentHeight;
}
@endScrollView.mm
#import "ScrollView.h"
#define FRAME_RATE 60
#define BOUNCE_TIME 0.2f
@implementation ScrollView
-(id) init
{
int width = 250;
int height = 300;
self = [super initWithColor:ccc4(255, 0, 0, 255) width:width height:height];
if(self)
{
isTouchEnabled = YES;
isDragging = NO;
lasty = 0.0f;
yvel = 0.0f;
contentHeight = 10000;
direction = BounceDirectionStayingStill;
// Setup the scrolling table
scrollLayer = [CCColorLayer layerWithColor:ccc4(0, 255, 0, 255) width:width-10 height:contentHeight];
[scrollLayer setContentSize:CGSizeMake(width-10, contentHeight)];
[scrollLayer setAnchorPoint:ccp(0, 1)];
[scrollLayer setIsRelativeAnchorPoint:YES];
[scrollLayer setPosition:ccp(5, height)];
[self addChild:scrollLayer];
// TEST items!
for(int i = 0; i < contentHeight; i += 25)
{
CCLabel *tempLabel = [CCLabel labelWithString:[NSString stringWithFormat:@"Label #%d", (i/25)+1] fontName:@"Verdana" fontSize:20];
[tempLabel setPosition:ccp([tempLabel contentSize].width/2, i + ([tempLabel contentSize].height/2))];
[scrollLayer addChild:tempLabel];
}
[self schedule:@selector(moveTick:) interval:1.0f/FRAME_RATE];
}
return self;
}
#pragma mark Scheduled Methods
- (void) moveTick: (ccTime)dt
{
CGPoint pos = [scrollLayer position];
if(!isDragging)
{
static float friction = 0.96f;
// positions for scrollLayer
float bottomY = [scrollLayer position].y + [self boundingBox].origin.y - [scrollLayer contentSize].height;
float topY = [scrollLayer position].y + [self boundingBox].origin.y;
// Bounding area of scrollview
float minY = [self boundingBox].origin.y;
float maxY = [self boundingBox].origin.y + [self boundingBox].size.height;
//NSLog(@"Top y: %f, bottom Y: %f", topY, bottomY);
//NSLog(@"\tminY: %f, maxY: %f", minY, maxY);
if(bottomY > minY && direction != BounceDirectionGoingDown)
{
NSLog(@"Go DOWN! %f > %f", bottomY, minY);
yvel = 0;
direction = BounceDirectionGoingDown;
}
else if(topY < maxY && direction != BounceDirectionGoingUp)
{
NSLog(@"Go UP! %f < %f", topY, maxY);
yvel = 0;
direction = BounceDirectionGoingUp;
}
if(direction == BounceDirectionGoingUp)
{
//NSLog(@"Going up!");
if(yvel <= 0)
{
float delta = (maxY - topY);
float yDeltaPerFrame = (delta / (BOUNCE_TIME * FRAME_RATE));
yvel = yDeltaPerFrame;
}
if(round(topY) == maxY)
{
NSLog(@"Last stop.");
pos.y = round(topY - [self boundingBox].origin.y);
yvel = 0;
direction = BounceDirectionStayingStill;
}
}
else if(direction == BounceDirectionGoingDown)
{
//NSLog(@"Going Down!");
if(yvel >= 0)
{
float delta = (minY - bottomY);
float yDeltaPerFrame = (delta / (BOUNCE_TIME * FRAME_RATE));
yvel = yDeltaPerFrame;
}
if(round(bottomY) == minY)
{
NSLog(@"Last stop.");
pos.y = round(bottomY - [self boundingBox].origin.y + [scrollLayer contentSize].height);
yvel = 0;
direction = BounceDirectionStayingStill;
}
}
else
{
yvel *= friction;
}
pos.y += yvel;
[scrollLayer setPosition:pos];
}
else
{
yvel = (pos.y - lasty)/2;
lasty = pos.y;
}
}
#pragma mark -
#pragma mark Touch Methods
- (void) ccTouchesBegan: (NSSet *)touches withEvent: (UIEvent *)event
{
isDragging = YES;
}
- (void) ccTouchesMoved: (NSSet *)touches withEvent: (UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint a = [[CCDirector sharedDirector] convertToGL:[touch previousLocationInView:touch.view]];
CGPoint b = [[CCDirector sharedDirector] convertToGL:[touch locationInView:touch.view]];
CGPoint nowPosition = [scrollLayer position];
nowPosition.y += ( b.y - a.y );
[scrollLayer setPosition:nowPosition];
}
- (void) ccTouchesEnded: (NSSet *)touches withEvent: (UIEvent *)event
{
isDragging = NO;
}
- (void) dealloc
{
[super dealloc];
}
@endsorry for bumping and old thread, but I need help figuring out @jamesgrote implementation for more than 2 pages.
Currently I need 4 pages, and with his implementation it works wonderfully snapping in the 2 firsts pages,and making modifications I get it to scroll to either the first one or the last one, but I'm not able to snap to all of them one by one
Basically, I'm trying to achieve same behaviour as the springboard when navigating through apps.
Any help would be really apreciated! Thanks!
@stuffradio I implemented a UIScrollView with Cocos2d and posted the project here: http://www.cocos2d-iphone.org/forum/topic/9417
rickystone
Member
hello everybody,
i use ScrollView, can not start a menu callback function..
CCMenuItemSprite *item = [CCMenuItemSprite itemFromNormalSprite:spritebk selectedSprite:nil target:self selector:@selector(callback1:)];
CCMenu* pmen = [CCMenu menuWithItems:item, nil];
[pmen setPosition:ccp(0,0)];
[scrollLayer addChild:pmen];
whatever i touch the sprite into menu, can not start callback1 function, what's wrong with me ? can anybody help me?
thanks.
here is my code:
//
// ScrollView.h
// tesg2
//
// Created by ricky stone on 12/31/11.
// Copyright (c) 2011 muhe. All rights reserved.
//
#import "CCLayer.h"
#import "cocos2d.h"
typedef enum
{
BounceDirectionGoingUp = 1,
BounceDirectionStayingStill = 0,
BounceDirectionGoingDown = -1
} BounceDirection;
@interface ScrollView : CCLayerColor
{
BounceDirection direction;
CCLayer *scrollLayer;
BOOL isDragging;
float lasty;
float yvel;
int contentHeight;
}
@end
//
// ScrollView.m
// tesg2
//
// Created by ricky stone on 12/31/11.
// Copyright (c) 2011 muhe. All rights reserved.
//
#import "ScrollView.h"
#define FRAME_RATE 60
#define BOUNCE_TIME 0.2f
@implementation ScrollView
-(id) init
{
int width = 400;
int height = 300;
self = [super initWithColor:ccc4(0, 0, 0, 0) width:width height:height];
if(self)
{
isTouchEnabled_ = YES;
isDragging = NO;
lasty = 0.0f;
yvel = 0.0f;
contentHeight = 300;
direction = BounceDirectionStayingStill;
// Setup the scrolling table
scrollLayer = [CCLayerColor layerWithColor:ccc4(0, 0, 0, 0) width:width-10 height:contentHeight];
[scrollLayer setContentSize:CGSizeMake(width-10, contentHeight)];
[scrollLayer setAnchorPoint:ccp(0, 1)];
[scrollLayer setIsRelativeAnchorPoint:YES];
[scrollLayer setPosition:ccp(5, height)];
[self addChild:scrollLayer];
// TEST items!
for(int i = 0; i < contentHeight; i += 70)
{
CCSprite* spritebk = [CCSprite spriteWithFile:@"setting.png"];
[spritebk setPosition:ccp([spritebk contentSize].width/2, i + ([spritebk contentSize].height))];
CCSprite* sprite0 = [CCSprite spriteWithFile:@"Icon.png"];
CCSprite* sprite1 = [CCSprite spriteWithFile:@"Icon.png"];
[spritebk addChild:sprite0];
[spritebk addChild:sprite1];
[sprite0 setPosition:ccp(sprite0.contentSize.width, spritebk.contentSize.height/2)];
[sprite1 setPosition:ccp(spritebk.contentSize.width - sprite1.contentSize.width, spritebk.contentSize.height/2)];
CCMenuItemSprite *item = [CCMenuItemSprite itemFromNormalSprite:spritebk selectedSprite:nil target:self selector:@selector(callback1:)];
CCMenu* pmen = [CCMenu menuWithItems:item, nil];
[pmen setPosition:ccp(0,0)];
[scrollLayer addChild:pmen];
}
[self schedule:@selector(moveTick:) interval:1.0f/FRAME_RATE];
}
return self;
}
-(void) callback1: (id) sender
{
NSLog(@"callback1\n");
}
#pragma mark Scheduled Methods
- (void) moveTick: (ccTime)dt
{
CGPoint pos = [scrollLayer position];
if(!isDragging)
{
static float friction = 0.96f;
// positions for scrollLayer
float bottomY = [scrollLayer position].y + [self boundingBox].origin.y - [scrollLayer contentSize].height;
float topY = [scrollLayer position].y + [self boundingBox].origin.y;
// Bounding area of scrollview
float minY = [self boundingBox].origin.y;
float maxY = [self boundingBox].origin.y + [self boundingBox].size.height;
//NSLog(@"Top y: %f, bottom Y: %f", topY, bottomY);
//NSLog(@"\tminY: %f, maxY: %f", minY, maxY);
if(bottomY > minY && direction != BounceDirectionGoingDown)
{
//NSLog(@"Go DOWN! %f > %f", bottomY, minY);
yvel = 0;
direction = BounceDirectionGoingDown;
}
else if(topY < maxY && direction != BounceDirectionGoingUp)
{
//NSLog(@"Go UP! %f < %f", topY, maxY);
yvel = 0;
direction = BounceDirectionGoingUp;
}
if(direction == BounceDirectionGoingUp)
{
//NSLog(@"Going up!");
if(yvel <= 0)
{
float delta = (maxY - topY);
float yDeltaPerFrame = (delta / (BOUNCE_TIME * FRAME_RATE));
yvel = yDeltaPerFrame;
}
if(round(topY) == maxY)
{
//NSLog(@"Last stop.");
pos.y = round(topY - [self boundingBox].origin.y);
yvel = 0;
direction = BounceDirectionStayingStill;
}
}
else if(direction == BounceDirectionGoingDown)
{
//NSLog(@"Going Down!");
if(yvel >= 0)
{
float delta = (minY - bottomY);
float yDeltaPerFrame = (delta / (BOUNCE_TIME * FRAME_RATE));
yvel = yDeltaPerFrame;
}
if(round(bottomY) == minY)
{
//NSLog(@"Last stop.");
pos.y = round(bottomY - [self boundingBox].origin.y + [scrollLayer contentSize].height);
yvel = 0;
direction = BounceDirectionStayingStill;
}
}
else
{
yvel *= friction;
}
pos.y += yvel;
[scrollLayer setPosition:pos];
}
else
{
yvel = (pos.y - lasty)/2;
lasty = pos.y;
}
}
#pragma mark -
#pragma mark Touch Methods
-(void) registerWithTouchDispatcher
{
[[CCTouchDispatcher sharedDispatcher] addTargetedDelegate:self priority:kCCMenuTouchPriority swallowsTouches:YES];
}
/*
- (void) ccTouchesBegan: (NSSet *)touches withEvent: (UIEvent *)event
{
isDragging = YES;
}
- (void) ccTouchesMoved: (NSSet *)touches withEvent: (UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint a = [[CCDirector sharedDirector] convertToGL:[touch previousLocationInView:touch.view]];
CGPoint b = [[CCDirector sharedDirector] convertToGL:[touch locationInView:touch.view]];
CGPoint nowPosition = [scrollLayer position];
nowPosition.y += ( b.y - a.y );
[scrollLayer setPosition:nowPosition];
}
- (void) ccTouchesEnded: (NSSet *)touches withEvent: (UIEvent *)event
{
isDragging = NO;
}*/
-(BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
{
isDragging = YES;
return TRUE;
}
-(void) ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
{
CGPoint a = [[CCDirector sharedDirector] convertToGL:[touch previousLocationInView:touch.view]];
CGPoint b = [[CCDirector sharedDirector] convertToGL:[touch locationInView:touch.view]];
CGPoint nowPosition = [scrollLayer position];
nowPosition.y += ( b.y - a.y );
[scrollLayer setPosition:nowPosition];
}
-(void) ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event
{
isDragging = NO;
}
-(void) ccTouchCancelled:(UITouch *)touch withEvent:(UIEvent *)event
{
}
- (void) dealloc
{
[super dealloc];
}
@end
Try following this tutorial : http://timroadley.com/2011/07/26/game-template-part-4-chapter-selection/
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