I have a UIScrollView with UIView added as subview. Now how do I open a new view when i touch on the view ?
I want new view to appear .before this i have buttons on my view...so button have the method "addtarget perform selector"...from that i am loading a new view
here is an image of my view
For example try following code (add it to your view):
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
NSUInteger tapCount = [touch tapCount];
CGPoint location = [touch locationInView:self.view];
switch (tapCount)
{
case 1:
{
UIView *view = [[UIView alloc] initWithFrame: CGRectMake(0.0f, 0.0f, 320.0f, 480.0f)];
view.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
view.backgroundColor = [UIColor whiteColor];
[self.view addSubview:view];
[view release];
}
break;
}
}
Related
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch * t =[touches anyobject];
CGpoint * point = [t locationinview:self.view];
If([t view]) == imageview {
Imageview.center = point;
}
}
Check is point inside the image rectangle:
if (CGRectContainsPoint(imageview.bounds, point)) {
//point inside imageView frame
}
You can also set up gesture recogniser on that image view and required method will be called just user touch that specific image, for example:
-(void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(imageTouched:)];
gr.numberOfTapsRequired = 1;
gr.numberOfTouchesRequired = 1;
[imageview addGestureRecognizer:gr];
}
-(void)imageTouched:(UITapGestureRecognizer*)recognizer{
//image view touched
}
I have a drawing view on a UIScrollView.
What I want to do is draw lines with one finger, and scrolling with two fingers.
The drawing view is to draw lines through touchesMoved as below.
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch;
CGPoint lastTouch, currentTouch;
for (touch in touches)
{
lastTouch = [touch previousLocationInView:self];
currentTouch = [touch locationInView:self];
CGContextRef ctx = CGLayerGetContext(drawLayer);
CGContextBeginPath(ctx);
CGContextMoveToPoint(ctx, lastTouch.x, lastTouch.y);
CGContextAddLineToPoint(ctx, currentTouch.x, currentTouch.y);
CGContextStrokePath(ctx);
}
[self setNeedsDisplay];
}
- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
CGContextDrawLayerInRect(drawContext, self.bounds, drawLayer);
CGContextClearRect(CGLayerGetContext(drawLayer), self.bounds);
[self setNeedsDisplay];
}
and on a viewController,
_scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
[_scrollView setContentSize:CGSizeMake(320, 800)];
[self.view addSubview:_scrollView];
_drawingView = [[DrawingView alloc] initWithFrame:CGRectMake(0, 0, 320, 800)];
[_scrollView addSubview:_drawingView];
for (UIGestureRecognizer *gestureRecognizer in _scrollView.gestureRecognizers)
{
if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]])
{
UIPanGestureRecognizer *panGR = (UIPanGestureRecognizer *) gestureRecognizer;
panGR.minimumNumberOfTouches = 2;
}
}
It works ok on simulator however the drawing is too slow on a real device. What is wrong and any suggestion?
Ty!
I solved.
Shouldn't draw whole screen with [self setNeedsDisplay]. Should draw a area where need to redraw with [self setNeedsDisplay withRect:]
Better use panGesture recogniger than touchesBegin~End. There's delay between touchesBegin and touchesEnd.
I'm trying to do a program that everytime my touches end, another UIView will appear using a loop for as many as UIView I want. How can I set a loop of UIView in my touches end? or should I create it in viewDidLoad and call it in touches end?
-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event//upon leaving
{
UITouch *touch = [touches anyObject];
for (int i=0; i < 100; i++) {
UIImageView *layerView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
[layerView setAlpha:.05];
[self.view addSubview:layerView];
}
}
Hope you can help me guys..
If you want to add a single view after each tap, you don't need a for loop. Just do
-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event//upon leaving
{
UITouch *touch = [touches anyObject];
UIImageView *layerView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
[layerView setAlpha:.05];
// If you just want to add a line, add another uiview would the easiest way. For example:
UIView *line = [UIView alloc] initWithFrame:CGRectMake(0, layerView.center.y, layerView.frame.size.width, 1)];
line.backgroundColor = [UIColor blackColor];
[layerView addSubview:line];
[self.view addSubview:layerView];
}
Of course, you can also subclass a UIView and draw whatever you want in
- (void)drawRect:(CGRect)rect
I have two imageViews imageView1 and imageView2. I have given gestureRecognizer to move these both images. Now the problem is when i move first imageView near second imageView only second image view is displayed. But when i put first imageView on another image the first imageView should be displayed on the second imageView which is not happening.Can any body please tell me how can the first imageView gets view on the top of another imageView.
You can use the UIView method bringSubviewToFront:, and pass in the UIImageView that you want displayed on top.
Why dont you use something similar like this to drag your UIImageViews?
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor yellowColor];
test1 = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
test1.backgroundColor = [UIColor whiteColor];
test1.userInteractionEnabled = YES;
test1.clipToBounds = YES;
[self.view addSubview:test1];
test2 = [[UIImageView alloc] initWithFrame:CGRectMake(400, 400, 100, 100)];
test2.backgroundColor = [UIColor whiteColor];
test2.userInteractionEnabled = YES;
test2.clipToBounds = YES;
[self.view addSubview:test2];
}
CGPoint startLocation;
float diffX;
float diffY;
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
if( [touch view] == test1)
{
startLocation = [touch locationInView:self.view];
[self.view bringSubviewToFront:test1];
}
if( [touch view] == test2)
{
startLocation = [touch locationInView:self.view];
[self.view bringSubviewToFront:test2];
}
}
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
if( [touch view] == test1)
{
CGPoint location = [touch locationInView:self.view];
diffX = location.x - startLocation.x;
diffY = location.y - startLocation.y;
test1.frame = CGRectMake(test1.frame.origin.x + diffX, test1.frame.origin.y + diffY, test1.frame.size.width, test1.frame.size.height);
startLocation = test1.frame.origin;
}
if( [touch view] == test2)
{
CGPoint location = [touch locationInView:self.view];
diffX = location.x - startLocation.x;
diffY = location.y - startLocation.y;
test2.frame = CGRectMake(test2.frame.origin.x + diffX, test2.frame.origin.y + diffY, test2.frame.size.width, test2.frame.size.height);
startLocation = test2.frame.origin;
}
}
//---EDIT---//
Added: cliptobounds in viewdidload
I want to create a little app that takes two images and i want to make only the image over draggable.
After research, i found this solution:
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[ event allTouches] anyObject];
image.alpha = 0.7;
if([touch view] == image){
CGPoint location = [touch locationInView:self.view];
image.center = location;
}
It works but the problem is that the image is draggable from its center and I don't want that.
So I found another solution:
- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
// Retrieve the touch point
CGPoint pt = [[touches anyObject] locationInView:self.view];
startLocation = pt;
[[self view] bringSubviewToFront:self.view];
}
- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
// Move relative to the original touch point
CGPoint pt = [[touches anyObject] locationInView:self.view];
frame = [self.view frame];
frame.origin.x += pt.x - startLocation.x;
frame.origin.y += pt.y - startLocation.y;
[self.view setFrame:frame];
}
It works very well but when I add another image, all the images of the view are draggable at the same time. I'm a beginner with the iPhone development and I have no idea of how I can only make the image over draggable.
You can use if condition in the touchesBegan: method, See this-
-(void)ViewDidLoad
{
//Your First Image View
UIImageView *imageView1 = [UIImageView alloc]initWithFrame:CGRectMake(150.0, 100.0, 30.0, 30.0)];
[imageView1 setImage:[UIImage imageNamed:#"anyImage.png"]];
[imageView1 setUserInteractionEnabled:YES];
[self.view addSubview:imageView1];
//Your Second Image View
UIImageView *imageView2 = [UIImageView alloc]initWithFrame:CGRectMake(150.0, 200.0, 30.0, 30.0)];
[imageView2 setImage:[UIImage imageNamed:#"anyImage.png"]];
[imageView2 setUserInteractionEnabled:YES];
[self.view addSubview:imageView2];
}
//Now Use Touch begin methods with condition like this
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches]anyObject];
if([touch view] == imageView1)
{
CGPoint pt = [[touches anyObject] locationInView:imageView1];
startLocation = pt;
}
if([touch view] == imageView2)
{
CGPoint pt = [[touches anyObject] locationInView:imageView2];
startLocation = pt;
}
}
//Use same thing with touch move methods...
- (void) touchesMoved:(NSSet *)touches withEvent: (UIEvent *)event
{
UITouch *touch = [[event allTouches]anyObject];
if([touch view] == imageView1)
{
CGPoint pt = [[touches anyObject] previousLocationInView:imageView1];
CGFloat dx = pt.x - startLocation.x;
CGFloat dy = pt.y - startLocation.y;
CGPoint newCenter = CGPointMake(imageView1.center.x + dx, imageView1.center.y + dy);
imageView1.center = newCenter;
}
if([touch view] == imageView2)
{
CGPoint pt = [[touches anyObject] previousLocationInView:imageView2];
CGFloat dx = pt.x - startLocation.x;
CGFloat dy = pt.y - startLocation.y;
CGPoint newCenter = CGPointMake(imageView2.center.x + dx, imageView2.center.y + dy);
imageView2.center = newCenter;
}
}
These two images will move only when you touch on it and move it. I hope my tutorials will help you.
Simply use these two methods
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
myImage.center = location;
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
[self touchesBegan:touches withEvent:event];
}
Let's break it down. You should have a main containerView (object of UIView) in your view controller. Within that, you should have DragableImageView objects.
DragableImageView inherits UIImageView and within that, you add your touches code. (Right now you are doing self.frame = position which is wrong - and obviously it will move all images at once - because if I understand correctly, you are adding these touches in your view controller).
Create only DragableImageView first, test it. Then add two DragableImageView instances. test them in different configurations.. you might want to hit test in the containerView to see which DragableImageView should be dragged (e.g. if you have jigsaw pieces, you might want to pick the one that is at the back rather than the front one).