I have craeted a UIScrollView using code and i have created subviews which i am creating dynamically from the DB that are added to the array of views and to the UIScrollviews.I am using touchesBegan and touchesMoved methods.The subview which i am selecting is not recognized,but the control comes into touchesBegan and touches moved method.I have posted the code below.Please anybody help me to overcome from this issue.
I have created the scrollview through code and i have subviews in an array named "arrayofviews".these subviews are the same views which are in the array.I am able to move these subviews which are from the DB on a normal view,but when i added these views to the scrollview its not working.
I have tried so many solutions which are in the net,but i couldn't get a proper solution.
.m file
- (void)viewDidAppear:(BOOL)animated
{
scrollview=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 374)];
scrollview.backgroundColor=[UIColor clearColor];
[scrollview setScrollEnabled:YES];
[scrollview setContentSize:CGSizeMake(300, 600)];
scrollview.showsVerticalScrollIndicator = YES;
scrollview.delaysContentTouches=NO;
.
.
.
.
//here i am retrieving the controls from the DB and adding into the "arrayofviews" array which is an NSMutableArray
//I have added subviews in this part to the scroll like
[scrollview addSubview:vw1];
[scrollview addSubview:vw2];
.
.
.
scrollview.userInteractionEnabled=NO;
scrollview.scrollEnabled=FALSE;
[self.view addSubview:scrollview];
[self.view bringSubviewToFront:scrollview];
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
scrollview.userInteractionEnabled=YES;
[self.nextResponder touchesBegan:touches withEvent:event];
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation;
touchLocation.x=scrollview.contentOffset.x;
touchLocation.y=scrollview.contentOffset.y;
for(UIView *vw in arrayOfViews)
{
vw.userInteractionEnabled=YES;
if([touch view]==vw)
{
vw.center=touchLocation;
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event //method to intiate the touch events
{
[self.nextResponder touchesMoved:touches withEvent:event];
UITouch *touch = [[event touchesForView:scrollview] anyObject];
CGPoint touchLocation1;
touchLocation1.x=scrollview.contentOffset.x;
touchLocation1.y=scrollview.contentOffset.y;
for(UIView *vw in arrayOfViews)
{
if([touch view]==vw)
{
vw.center=touchLocation1; //statement to move the control
}
}
}
change the line
scrollview.userInteractionEnabled=NO;
to
scrollview.userInteractionEnabled=YES;
reason
userInteractionEnabled tells the device, whether to accept touch events. As you disabled the touch on scrollView then how it could recived touches events...
cheers!!!
Related
I have UIScrollView with many UIImageViews.I need to drag and drop image from UIScrollView to another view. Outside the scrollView touch is worked. But inside scroll view touch is not worked. I used touchesBegan,touchesMoved etc method. Please help me.
-(IBAction)selectBut:(id)sender
{
scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(x,y,w,h)];
scrollView.userInteractionEnabled = YES;
int y = 0;
for (int i = 0; i < [myArray count]; i++) {
UIImageView *image = [[UIImageView alloc]initWithFrame:CGRectMake(0, y, 75, 30)];
image.userInteractionEnabled = YES;
y=y+35;
[scrollView addSubview:image];
}
[self.view addSubview:scrollView];
[scrollView setContentSize:CGSizeMake(150, 300)]
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 1) {
NSLog(#"One touch !!");
}
}
you need to customize the UIImageView with your own view inherited from UIImageView. Provide touch methods in that customized subclass and add it on your UIScrollView..
Subviews of UIScrollview will never call touchesBegan method directly. You need to customized with subview to get touchesBegan properties of that added subview/customized view.
I mean to say take subclass of ImageView like
CustomImageView *imageView = [[CustomImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
[imageView setUserInteractionEnabled:YES];
[scrollView addSubview:imageView];
[imageView release];
CustomImageView class is should be inherited from UIImageView like
#interface CustomImageView : UIImageView
{
}
in # .m File
#import "CustomImageView.h"
#implementation CustomImageView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
}
return self;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
NSLog(#"%s", __FUNCTION__);
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 2) {
drawImageView.image = nil;
return;
}
}
Add a Tap gesture recognizer to the scroll view for enabling touch inside scroll view:
UITapGestureRecognizer *singlTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(methodName:)];
singlTap.cancelsTouchesInView = NO; //Default value for cancelsTouchesInView is YES, which will prevent buttons to be clicked
[scrollViewName addGestureRecognizer:singlTap];
then write your code in specified method.
-(void)methodName:(UITapGestureRecognizer *)gesture
{
//your code here
}
I don't know if this help you. But try to set the exclusiveTouch property of the UIImageView to YES.
Did you add your scrollview as an IBOutlet? If its from xib and as you say touches are available outside the scroll and not within, I guess you might have accidentally unchecked userInteractionEnabled for the scrollview which inhibits touch events. And you have added UIImageViews as subviews to UIScrollView. For UIImageView you have to first set userInteractionEnabled to YES and then add any gestures if necessary to get events or use the touchesBegan, touchesMoved methods. Unless you set interaction enabled you wont receive touch events on UIImageView. If the parent view I mean the UIScrollView's interaction is disabled you wont get touches on UIImageView too. Hope this helps :)
I have subclassed UIView and there initially my view will be in a default color and i need to fill some different color on touch (from x axis = 0 to user touched point),here the problem is touchesMoved even if i drag out of my self view bounds it is getting those points,how to restrict it to only for my self view bounds.
I googled & tried below snippets but of no luck
if([self pointInside:point withEvent:nil]){
[self fillColor];
}
My touchesMoved method is as below,
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self];
endPoint = point;
NSLog(#"moved x: %f,y: %f",point.x,point.y);
if(CGRectContainsPoint([self frame], endPoint)){ // this also not working
[self fillColor];
}
}
Any help is appreciated in advance.
just set tag in viewDidLoad: method and use bellow logic..
fillColorView.tag = 111;
and use bellow logic in touchesMoved: method like bellow..
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *tap = [touches anyObject];
CGPoint pointToMove = [tap locationInView:fillColorView];
if([tap.view isKindOfClass:[UIView class]])
{
UIView *tempView=(UIView *) tap.view;
if (tempView.tag == 111){
[self fillColor];
}
}
}
hope this help you...
In your touchesMoved method, CGPoint point = [touch locationInView:self]; replcae self by the view in which you wants the touch to be worked.
self will get the complete view, you should pass your drawingView at there, so that it will detetc touch only on that view.
How can I hide my keyboard when I click on my UIImageView?
I am trying to use this soution but it does not work with UIImageView:
- (IBAction)backgroundTap:(id)sender
{
logLang.hidden=YES;
pasComp.hidden=YES;
[login resignFirstResponder];
[password resignFirstResponder];
}
Make sure your image view user interaction enabled in xib? if you are adding your imageView pro grammatically then
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
if ([touch view] == yourImageView) {
logLang.hidden=YES;
pasComp.hidden=YES;
[login resignFirstResponder];
[password resignFirstResponder];
}
}
use the UIResponder methods touchesBegan, touchesMoved, touchesEnded etc to detect the touch on the image view
This is a beginner's question I'm afraid:
I have an UIText which covers the entire screen. I have another transparent view on top of this UITextView so as to be able to recognise swiping gestures (horizontally and vertically), like so:
- (void)viewDidLoad
{
[super viewDidLoad];
// UITextView
CGRect aFrame = CGRectMake(0, 0, 320, 480);
aTextView = [[UITextView alloc] initWithFrame:aFrame];
aTextView.text = #"Some sample text.";
[self.view addSubview:aTextView];
// canTouchMe
CGRect canTouchMeFrame = CGRectMake(0, 0, 320, 480);
canTouchMe = [[UIView alloc] initWithFrame:canTouchMeFrame];
[self.view addSubview:canTouchMe];
}
Let's consider the user touches (not swipes) the canTouchMe View. In this case, I would like the canTouchMe view to disappear and pass on the touch to the UITextView hiding beneath so that it enters the editing mode and enable the 'natural' scrolling options an UITextView has (i.e. only horizontally).
My touches began method looks like this:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
UITouch *touch =[touches anyObject];
gestureStartPoint = [touch locationInView:self.view];
}
How do I tell this method that IF it recognises only ONE touch, that it should hide the canTouchMeFrame and PASS ON the touch to the UITextView?
Sorry if this is basic, but I have no idea how to implement this. Thanks for any suggestions.
EDIT:
I introduced a touchEnded method, but I still have no luck. The touch will not be forwarded to the UITextView. I need to tap twice in order to edit it:
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesMoved:touches withEvent:event];
UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:self.view];
CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x); // will always be positive
CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y); // will always be positive
if (deltaY == 0 && deltaX == 0) {
label.text = #"Touch"; [self performSelector:#selector(eraseText) withObject:nil afterDelay:2];
[aTextView touchesBegan:touches withEvent:event];
[self.view bringSubviewToFront:aTextView];
[self.view bringSubviewToFront:doneEdit];
}
}
NSSet has a -count method. If touches only has one object, then you're responding to a single touch.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
if ([touches count] == 1) {
[self hideMyRectangle];
[someOtherObject touchesBegan:touches withEvent:event];
//etc, etc.
return;
}
// if you get here, there's more than one touch.
UITouch *touch =[touches anyObject];
gestureStartPoint = [touch locationInView:self.view];
}
I have a great problem since last 2 days. I'm working with a multiple Touch enabled view. My UIViewController has 8-10 imageview. I want to detect touch on each view separately, but multiple view at a time. Touch is detected on all image view, but problem is here-
Suppose I have Tap on a image view and hold down this image view and now tap another image view, second image view is detected touch successfully but it also trigger to first image view which is previously touched and hold down. But I don't want it. So please any one help me. Code level help is appreciated.
NB. My UIViewController also implemented TouchesMoved Methods for swiping purpose.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
for(UITouch *touch in event.allTouches) {
if(CGRectContainsPoint([imView1 frame], [touch locationInView:self.view])){
NSLog(#"imView 1 touched");
}
if(CGRectContainsPoint([imView2 frame], [touch locationInView:self.view])){
NSLog(#"imView 2 touched");
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
for(UITouch *touch in event.allTouches) {
if(CGRectContainsPoint([imView1 frame], [touch locationInView:self.view])){
NSLog(#"imView 1 touch moved");
}
if(CGRectContainsPoint([imView2 frame], [touch locationInView:self.view])){
NSLog(#"imView 2 touch moved");
}
}
}
Try subclassing a UIImageView and handle the touches code in that subclass. If you need to pass the touch to the parent for some reason, you can handle the touch then send it on to the parent which would be your view controller.
EDIT:
have your custom class like this
#interface CustomImageView : UIImageView {}#end
#implementation CustomImageView
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(#"touch began %d",self.tag);
[self.nextResponder touchesBegan:touches withEvent:event];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(#"touch moved %d",self.tag);
[self.nextResponder touchesMoved:touches withEvent:event];
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(#"touch ended %d",self.tag);
[self.nextResponder touchesEnded:touches withEvent:event];
}
#end
and have your parrent code something like this
#implementation trashmeTouchIpadViewController
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(#"parent Touch Began");
//do parent stuff
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
NSLog(#"parent Touch ended");
//do parent stuff
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.view setMultipleTouchEnabled:YES];
UIImage *i1 = [UIImage imageNamed:#"img1.jpg"];
CustomImageView *v1 = [[CustomImageView alloc] initWithImage:i1];
v1.frame = CGRectMake(100, 100, 200, 200);
v1.userInteractionEnabled = YES;
v1.multipleTouchEnabled = YES;
v1.tag = 111;
[self.view addSubview:v1];
[v1 release];
UIImage *i2 = [UIImage imageNamed:#"img2.jpg"];
CustomImageView *v2 = [[CustomImageView alloc] initWithImage:i2];
v2.frame = CGRectMake(500, 100, 200, 200);
v2.userInteractionEnabled = YES;
v2.multipleTouchEnabled = YES;
v2.tag = 999;
[self.view addSubview:v2];
[v2 release];
}