.m
self.elements=[myElements getElements];
imagesElements = [[NSMutableArray alloc]init];
for(ElemetsList *item in self.elements)
{
UIImageView *oneelement = [[UIImageView alloc] initWithImage:[UIImage imageNamed:item.imgElement]];
oneelement.frame = CGRectMake(item.positionX, item.positionY, item.width, item.height);
oneelement.userInteractionEnabled=YES;
[imagesElements addObject:oneelement];
}
for(UIImageView *img in imagesElements)
[self.view addSubview:img];
Then I try to interact with the elements:
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
for(UIImageView *img in imagesElements)
{
if([self view] == img)
{
CGPoint location = [touch locationInView:self.view];
img.center=location;
}
}
}
But "if ([self view] == img)" is always "NO". Therefore, the elements do not drag.
How to drag and drop items if they are in the array?
When you add your image views, you make them subviews of self.view, therefore you need to test whether img is in the subviews array. It can't be equal to the view that contains it.
Related
I have added the view programmatically in the main view. And in the parent view i am adding imageview as a subview programmatically. Now I have set the touch event for imageview on click but its not working. It is not detecting the touch event on click. I am using the following code of touch event of imageview.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch view] == originalphoto)
{
[fullview setHidden:NO];
[self.view addSubview:fullview];
[setimage setImage:image];
}
}
Do anyone has idea that how to set touch event of imageview which has been added programmatically?
Thanks alot.
Why dont you use a gesture? it is lot easier. You could use the UITapGestureRecognizer and let it work for you: http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UITapGestureRecognizer_Class/Reference/Reference.html
//Add gesture to your view
UITapGestureRecognizer *Tap= [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(ResignResponder:)];
[tempV addGestureRecognizer:Tap];
[Tap release];
//method will be called on tapping the view
-(void)ResignResponder:(UIGestureRecognizer*)recognizer {
[LocSearchField resignFirstResponder];
[self.view sendSubviewToBack:tempV];
}
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:UIIMAGEVIEW];// uiimageview object
touchx = location.x;
touchy = location.y;
NSLog(#" x= %i ", touchx);
NSLog(#"y = %i",touchy);
Maybe you need to set property imageView.userInteractionEnabled = YES?
I believe I may be dealing with some view issues which are not allowing me to detect and add UIImageView objects to an array. I could really use some suggestions.
I've got a number of UIImageViews with images linked to a UIView that sits on top of a UIViewController (the UIView was added to help with drawRect and some additional advantages). So, when I touch an image and 'drag and drop' it, I want to add that image to an array upon being dropped.
My touchesBegan gets the location of the touch and checks UIImageView is being touched and then centers on that view as follows:
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:self]; //can't use self.view in a UIView, this may be causing issues?
startLocation = location; // for reference as needed
NSLog(#"Image x coord: %f", location.x);
NSLog(#"Image y coord: %f", location.y);
if ([touch view] == obiWan_Block)
{obiWan_Block.center = location;}
else if ([touch view] == r2d2_Block)
{r2d2_Block.center = location;}
else if ([touch view] == you_Block)
{you_Block.center = location;}
}
Then, I drag the UIImageView around with touchesMoved and finally, 'drop' the image with touchesEnded. When the UIImageView is drop in a certain area of the screen, I 'snap' it to a specific location. It's at this point I want to place this UIImageView into an array, but I'm having no luck. I believe I'm getting confused on the various views being touched and what's getting added via addObject to my NSMutableArray. Or, I could be missing something completely. Here's my touchedEnded method:
-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:self];
UIView *temp = [touch view];
UIImageView *currentImageView = (UIImageView *)[touch view]; //DON'T THINK THIS IS RIGHT
NSLog(#"Current Image View is: %#", currentImageView);
if ((location.x > dropZone.origin.x) && (location.y >= dropZone.origin.y) && ([touch view] != NULL))
{
CGRect frame = temp.frame;
if (touchCount == 0) {
frame.origin.x = 15;
frame.origin.y = 180;
temp.frame = frame;
[quoteArray addObject: currentImageView];
touchCount++;
}
else if (touchCount == 1) {
frame.origin.x = 70;
frame.origin.y = 180;
temp.frame = frame;
[quoteArray addObject: currentImageView];
touchCount++;
}
....
I have an NSLog statement to check if addObject is working as follows:
NSLog(#"the quote array contains %d items. Contents = %#",[quoteArray count], quoteArray);
The log always says:
the quote array contains 0 items. Contents = (null)
Please advise and thanks!
Your last part of code shows that you have uninitialized quoteArray. Check code when you create it, I guess you missed something in your init method. Because if array was correct then NSLog should show below:
NSArray *quoteArray = [NSArray array];
NSLog(#"%#", quoteArray);
2011-11-17 17:37:00.506 TestApp[1382:207] ( )
What is the code when you want to instantiate an object (for example a bullet) on a certian position on screen? I've tried it myself and searched on the internet but there are no good examples or basic Xcode tutorials that explain this. I don't use Cocos2d. Help is much appreciated :) Thanks in advance!
//
// CoreViewController.m
// Core
//
// Created by user on 29-04-11.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import "CoreViewController.h"
#implementation CoreViewController
#synthesize ship;
#synthesize bullet;
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
if ([touch view] == ship){
//ship
CGPoint location = [touch locationInView:self.view];
ship.center = location;
}
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
if ([touch view] == ship){
//bullet
// CGPoint blltPos = bullet.center;
CGPoint shpPos = ship.center;
// blltPos.x = blltPos.x += 3;
// bullet.center = blltPos;
UIImage *bulletImage = [UIImage imageNamed:#"bullet.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:bulletImage];
imageView.frame = CGRectMake(shpPos.x, shpPos.y, 60, 60);
}
}
#end
If you are using UIKit:
Create a UIImageView that contains a UIImage of the bullet.
Set the frame of the UIImageView to be the location you want (offset to the center) and the size of the image.
Quick example:
UIImage *bulletImage = [UIImage imageNamed:#"bullet.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:bulletImage];
imageView.frame = CGRectMake(xLoc, yLoc, bulletImage.size.width, bulletImage.size.height);
Maybe you've already figured it out, but to add the new UIImageView to a parent view, probably(?) the CoreViewController, you'll have to do something like this after you've done what Mark wrote:
[self.view addSubview:imageView];
or
[self.view insertSubview:imageView atIndex:0];
In the latter example you decides its z-position (atIndex) of the subviews, i.e if you want it to be in front or behind other subviews.
Fairly common question this, to which I have a few answers and I'm nearly there. I have a button which when pressed, will create an image (code as follows)
(numImages is set on load to ZERO and is used as a count up for the tag numbers of all images created)
UIImage *tmpImage = [[UIImage imageNamed:[NSString stringWithFormat:#"%i.png", sender.tag]] retain];
UIImageView *myImage = [[UIImageView alloc] initWithImage:tmpImage];
numImages += 1;
myImage.userInteractionEnabled = YES;
myImage.tag = numImages;
myImage.opaque = YES;
[self.view addSubview:myImage];
[myImage release];
I then have a touchesBegan method which will detect what's touched. What I need it to do is to allow the user to drag the newly created image. It's nearly working, but the image flickers all over the place when you drag it. I can access the image which you click on as I can get it's TAG, but I just cannot drag it nicely.
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
if (touch.view.tag > 0) {
touch.view.center = location;
}
NSLog(#"tag=%#", [NSString stringWithFormat:#"%i", touch.view.tag]);
}
- (void) touchesMoved:(NSSet *)touches withEvent: (UIEvent *)event {
[self touchesBegan:touches withEvent:event];
}
It works, in that I get an output of the tag for each image as I click on them. But when I drag, it flashes... any ideas?
In answer to my own question - I decided to create a class for handling the images I place on the view.
Code if anyone's interested....
Draggable.h
#import <Foundation/Foundation.h>
#interface Draggable : UIImageView {
CGPoint startLocation;
}
#end
Draggable.m
#import "Draggable.h"
#implementation Draggable
- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
// Retrieve the touch point
CGPoint pt = [[touches anyObject] locationInView:self];
startLocation = pt;
[[self superview] bringSubviewToFront:self];
}
- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
// Move relative to the original touch point
CGPoint pt = [[touches anyObject] locationInView:self];
CGRect frame = [self frame];
frame.origin.x += pt.x - startLocation.x;
frame.origin.y += pt.y - startLocation.y;
[self setFrame:frame];
}
#end
and to call it
UIImage *tmpImage = [[UIImage imageNamed:"test.png"] retain];
UIImageView *imageView = [[UIImageView alloc] initWithImage:tmpImage];
CGRect cellRectangle;
cellRectangle = CGRectMake(0,0,tmpImage.size.width ,tmpImage.size.height );
UIImageView *dragger = [[Draggable alloc] initWithFrame:cellRectangle];
[dragger setImage:tmpImage];
[dragger setUserInteractionEnabled:YES];
[self.view addSubview:dragger];
[imageView release];
[tmpImage release];
Usually you get an implicit animation when you change center. Are you messing with -contentMode or calling -setNeedsDisplay by any chance?
You can explicitly request animation to avoid the delete and re-draw this way:
if (touch.view.tag > 0) {
[UIView beginAnimations:#"viewMove" context:touch.view];
touch.view.center = location;
[UIView commitAnimations];
}
Do note that NSLog() can be very slow (much slower than you'd expect; it's much more complicated than a simple printf), and that can cause trouble in something called as often as touchesMoved:withEvent:.
BTW, you're leaking tmpImage.
I'm creating an application where I want to let the user move (not pan) an UIImageView around by dragging it on the screen. Additionally, I want the user to be able to zoom the UIImageView in and out.
As such I've been using a custom UIScrollView that forwards single touches to the 'contentView':
#implementation JM_UIScrollView
- (BOOL)touchesShouldBegin:(NSSet *)touches withEvent:(UIEvent *)event inContentView:(UIView *)view
{
NSSet *allTouches = [event allTouches];
NSLog(#"Checking for touches: %d", [allTouches count]);
if ([allTouches count] == 1) {
return YES;
}
return NO;
}
#end
Along with a custom UIImageView that implements touchesBegan and touchesMoved to determine where to move the UIImageView:
#implementation JM_UIImageView
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
NSSet *allTouches = [event allTouches];
if ([allTouches count] == 0)
return;
UITouch *firstTouch = [[allTouches allObjects] objectAtIndex: 0];
CGPoint touchLoc = [firstTouch locationInView: [self superview]];
touchOffset= CGPointMake(touchLoc.x-self.center.x,touchLoc.y-self.center.y);
NSLog(#"Currently at: %3.3f x %3.3f", touchLoc.x, touchLoc.y);
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
NSSet *allTouches = [event allTouches];
if ([allTouches count] == 0)
return;
UITouch *firstTouch = [[allTouches allObjects] objectAtIndex: 0];
CGPoint touchLoc = [firstTouch locationInView: [self superview]];
if ([allTouches count] == 1)
{
if ([firstTouch view] == self)
{
touchLoc.x -= touchOffset.x;
touchLoc.y -= touchOffset.y;
NSLog(#"Moved to: %3.3f x %3.3f", touchLoc.x, touchLoc.y);
self.center = touchLoc;
}
}
}
#end
This is then all glued together:
scrollView = [[JM_UIScrollView alloc] initWithFrame: [[UIScreen mainScreen] bounds]];
scrollView.delegate = self;
scrollView.bouncesZoom = YES;
scrollView.scrollEnabled = NO;
scrollView.backgroundColor = [UIColor redColor];
scrollView.clipsToBounds = YES;
UIImage *image = [UIImage imageNamed:#"berg.jpg"];
imageView = [[JM_UIImageView alloc] initWithFrame: CGRectMake(0, 0, 140, 230)];
imageView.image = image;
imageView.center = CGPointMake(200,300);
[imageView setUserInteractionEnabled: YES];
[scrollView addSubview: imageView];
scrollView.contentSize = CGSizeMake(140,230);
scrollView.minimumZoomScale = 0.2;
scrollView.maximumZoomScale = 1.1;
[window addSubview: scrollView];
// Override point for customization after application launch
[window makeKeyAndVisible];
The problem:
When I start the application, I can move the UIImageView just fine and fluently. I can zoom-in and still be able to move it around.
However, it seems that whenever I zoom back out to the maximum level I seem then unable to move the UIImageView around anymore. It will jump at times, but by a maximum of 10 pixels. Use of NSLog() shows the touchesBegan/touchesMoved methods on the JM_UIImageView are no longer called.
Does anyone have any idea on what I might be missing here?
EDIT:
Would also accept an answer for wether or not this is the only way of implementing pinch-zooming with the zoombounce animation.