Using xCode 4.3.2, I have the following code in initWithFrame in my view.m:
UIPinchGestureRecognizer *recognizer = [[UIPinchGestureRecognizer alloc]
initWithTarget: self action: #selector(pinch:)
];
oldScale = recognizer.scale;
[self pinch: recognizer];
[self addGestureRecognizer: recognizer];
// code to create label is also in here, works. label displays no problem
[self addSubview: label];
my pinch method is as follows:
- (void) pinch: (UIPinchGestureRecognizer *) recognizer
{
NSLog(#"pinch:");
label.bounds = CGRectMake(
(self.bounds.size.width - width * recognizer.scale) / 2,
(self.bounds.size.height - height * recognizer.scale) / 2,
width * recognizer.scale,
height * recognizer.scale
);
label.font = [UIFont systemFontOfSize: 20 * recognizer.scale];
NSString *verdict;
if (recognizer.scale > oldScale) {
verdict = #"spread";
} else if (recognizer.scale < oldScale) {
verdict = #"pinch";
} else {
verdict = #"neither";
}
oldScale = recognizer.scale;
label.text = [NSString stringWithFormat: #"%# %g",
verdict, recognizer.scale
];
}
because i actually call pinch in my initWithFrame method, it runs once, but when i perform a pinch in the iphone simulator, it doesn't register at all. is there some setting in xcode 4.3.2 i don't know about? this code works everywhere else i've tried running it - but those versions of xcode are all 4.3.
Add UIGestureRecognizerDelegate in .h file
Use following code in .m file in view did load...
// Gesture Reconizer Delegate Methods
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
return YES;
}
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
return YES;
}
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:#selector(checkpinch)];
[pinch setDelegate:self];
[pinch setDelaysTouchesBegan:YES];
[self.ScrollView addGestureRecognizer:pinch];
[pinch release];
// Gesture Reconizer Methods
-(void)checkpinch {
NSLog(#"YES");
}
>>See this Edited..
Pinch can detect on scroll-view if you want to detect on view than see following reference...
Detect pinch on UIView
Hope, this will help you...
Maybe I am oversimplifying this, but wouldn't be easier to: 1) In your VC, create an IBoutlet property to an instance of your view 2) connect that IBOutlet to your view 3) setup your UIPinchGetsureRecognizer in the VC by overriding the view setter method and change target to the view and keep the pinch method in the view. This way the UIPinchGetsureRecognizer will load every time the view is loaded and be ready for a pinch. Then you would not need to call the pinch method (which defeats the purpose). KB
Related
I have a View which is the subView of the main view in iphone app I want that when subView is shown and user taps on part of the screen except the subView then subView should hide.
Here is the code which I got but it does not hide it :
UITapGestureRecognizer *tapGR;
tapGR = [[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTap:)] autorelease];
tapGR.numberOfTapsRequired = 1;
[self.View addGestureRecognizer:tapGR];
// Add a delegate method to handle the tap and do something with it.
-(void)handleTap:(UITapGestureRecognizer *)sender
{
if (sender.state == UIGestureRecognizerStateEnded) {
// handling code
[myViewSheet removeFromSuperView];
}
}
implement UIGestureRecognizerDelegate protocol:
.h:
#interface YourView : UIView<UIGestureRecognizerDelegate>
.m:
#implementation YourView{
UIView * subview;
}
...
subview = [[UIView alloc]initWithFrame:CGRectMake(0, 200, 320, 200)];
[self addSubview:subview];
UITapGestureRecognizer *tapGR;
tapGR = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTap:)];
tapGR.numberOfTapsRequired = 1;
tapGR.delegate = self;
[self addGestureRecognizer:tapGR];
...
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if (touch.view == subView)
{
return NO;
}
else
{
return YES;
}
}
You probably need to set userInteractionEnabled = YES on your main view (The one to which you are attaching the gesture recognizer.)
I have a tutorial for my app, which should display only the first time the app is opened and should be tapped to dismiss.
I am initializing a UITapGestureRecognizer in my viewDidLoad:
tapper_tut = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleSingleTap:)];
tapper_tut.cancelsTouchesInView = FALSE;
[self.view addGestureRecognizer:tapper_tut];
and I have an IBAction to detect the tap and set the tutorial to hidden:
- (IBAction)dismiss_tut{
if (????????????????) {
_tutorial.hidden = YES;
}
}
But I have no idea what to put in the if statement condition, or if this is even that right way to go about this.
How would I dismiss a UIImageView on a tap?
UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleGesture:)];
[self.view addGestureRecognizer:gr];
// if not using ARC, you should [gr release];
// mySensitiveRect coords are in the coordinate system of self.view
- (void)handleGesture:(UIGestureRecognizer *)gestureRecognizer {
CGPoint p = [gestureRecognizer locationInView:self.view];
if (CGRectContainsPoint(mySensitiveRect, p)) {
NSLog(#"got a tap in the region i care about");
} else {
NSLog(#"got a tap, but not where i need it");
}
}
You can make viewDidLoad like this
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
/* Create the Tap Gesture Recognizer */
self.tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(handleTaps:)];
/* The number of fingers that must be on the screen */
self.tapGestureRecognizer.numberOfTouchesRequired = 1;
/* The total number of taps to be performed before the gesture is recognized */
self.tapGestureRecognizer.numberOfTapsRequired = 1;
/* Add this gesture recognizer to the view */
[self.view addGestureRecognizer:self.tapGestureRecognizer];
}
To detect the taps you can make the method like this.
- (void) handleTaps:(UITapGestureRecognizer*)paramSender
{
NSUInteger touchCounter = 0;
for (touchCounter = 0;touchCounter < paramSender.numberOfTouchesRequired;touchCounter++)
{
CGPoint touchPoint =[paramSender locationOfTouch:touchCounter inView:paramSender.view];
NSLog(#"Touch #%lu: %#",(unsigned long)touchCounter+1, NSStringFromCGPoint(touchPoint));
}
}
you have to declare .h file as "UIGestureRecognizerDelegate"
you have getting tap of gesture as two way as given below steps.
1) Call delegate method of GestureRecognizer (not given action )
UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:nil]; // not given action.
recognizer.numberOfTouchesRequired=1;// here how many tap you want set it
[self.view addGestureRecognizer:recognizer];
recognizer.delegate = self;
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
//whatever you want write code here
return NO;
}
2) given action
UITapGestureRecognizer *oneTouch=[[UITapGestureRecognizer alloc]initWithTarget:self action:#selector(Addphoto)];
[oneTouch setNumberOfTouchesRequired:1];
[self.view addGestureRecognizer:oneTouch];
-(IBAction)Addphoto
{
//whatever you want write code here
}
may be it will help .
I think u need to detect the first time launch of the application which u can do with following
![[NSUserDefaults standardUserDefaults] boolForKey:#"HasLaunchedOnce"]
Put this in your if statement .
For a exercise I created a project to experiment with the accelerometer functions of the iPhone. Right now when I run the app on my device it begins with a blank screen, shake the phone and a image is displayed.
I have to force close the app to clear the image. I was hoping someone could provide a solution that would make the image reset so I could repeat the process as many times as I wanted. (shake phone, display image, clear image) I'm thinking it needs a timer or something, not sure. Here is the source code. Thanks for taking the time to read and help.
// ViewController.m
// AccelTest
//
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
}
-(void)viewWillAppear:(BOOL)animated{
[self startAccel];
[self view];
}
-(void)viewWillDisappear:(BOOL)animated{
[self stopAccel];
[self view];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return NO;
}
-(void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration{
double const kThreshold = 2.0;
// double const kThreshold = 2.0;
if ( fabsf(acceleration.x) > kThreshold
|| fabsf(acceleration.y) > kThreshold
|| fabsf(acceleration.z) > kThreshold){
[self.view addSubview:[[UIImageView alloc]initWithImage:[UIImage imageNamed:#"Icon.png"]]];
}
}
-(void)startAccel{
UIAccelerometer * accel = [UIAccelerometer sharedAccelerometer];
accel.delegate = self;
accel.updateInterval = .25;
}
-(void)stopAccel{
UIAccelerometer * accel = [UIAccelerometer sharedAccelerometer];
accel.delegate = nil;
}
#end
Here is how I would do it (without ARC) to tap the image to make it disappear.
Remove your line:
[self.view addSubview:[[UIImageView alloc]initWithImage:[UIImage imageNamed:#"Icon.png"]]];
And add these lines instead:
UIImageView *myImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Icon.png"]];
myImageView.userInteractionEnabled = YES;
UITapGestureRecognizer *tapgr = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(rm:)];
[myImageView addGestureRecognizer:tapgr];
[tapgr release]; tapgr = nil;
[self.view addSubview:myImageView];
[myImageView release]; myImageView = nil;
Then add a method to the View Controller to remove the UIImageView when it is tapped.
-(void)rm:(UITapGestureRecognizer *)tapgr {
[tapgr.view removeFromSuperview];
}
When that Image is tapped once, the rm: method will be called which will remove the Image from self.view
Store a pointer to that image view somewhere and remove it from it's superview when you want to. Either with a timer, or user action, or something like that.
I've been playing around with this code, but can't get it right.
Current behaviour: I can scroll around freely on a UIScrollView, even when tapping on buttons. When i tap on something that isn't a button, it calls a method (like i want it to), as a result of a UITapGestureRecognizer. However, i have to hold down on a button for a couple of seconds then touch up for it to trigger the button's UIControlEventTouchUpInside.
What I want to happen: Exactly the same, but to be able to touch the UIButton easily, like I can if i turn off the UITapGestureRecognizer on the view it's sitting on.
Here's my code:
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
//...
[cell.xButton addTarget:self action:#selector(xButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
self.delaysContentTouches = YES;
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapFrom:)];
[self addGestureRecognizer:tapGestureRecognizer];
tapGestureRecognizer.delegate = self;
}
}
- (void) handleTapFrom: (UITapGestureRecognizer *)recognizer
{
[self.header removeKeyboard];
}
As stavash suggested, you could do the following:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
UIView* touchedView = [touch view];
if([touchedView isKindOfClass:[UIButton class]]) {
return NO;
}
return YES;
}
This works in most cases. In addition you may want to check whether the touched view is a descendent of a the scroll view using isDescendantOfView:.
Hope it helps.
I think your answer is UIGestureRecognizerDelegate's method:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
Check if the touch's view property is any of the UIButtons you are trying to avoid: if so return NO, otherwise return YES. Don't forget to assign the UITapGestureRecognizer's delegate so it works. Hope this helps.
I have a View generated like this :
oneView = [[UIView alloc] initWithFrame:CGRectMake(x, y , w, h)];
oneView.tag = i;
UITapGestureRecognizer* recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleSingleTap2:)];
[recognizer setNumberOfTouchesRequired:1];
[oneView addGestureRecognizer:recognizer];
recognizer.delegate = self;
[recognizer release];
- (void)handleSingleTap2:(UITapGestureRecognizer *)recognizer {
int viewID = recognizer.view.tag;
NSLog(#"id : %d", viewID);
}
This works, but if I replace the UIView alloc with a UIWebView or UIImageView alloc, then touch event is not triggerred anymore.
How may I make it work ?
set userInteractionEnabled=YES and if needed multipleTouchEnabled=YES
Regarding your question about the UIWebView I suggest you have a look at drawnonward's Answer :
Does UIGestureRecognizer work on a UIWebView?
And for the UIImageView Part see this Tutorial:
UIImageView-with-zooming-tapping
I could not paste the code here but i think this will keep this area cleaner and easier to read.
you must override
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;
delegate function and return YES;