I have created simple single view application and added just one button to view.
Next i used next code to determine all subviews and it's gesture recognizers:
-(void) debug:(UIView*) view{
for(UIGestureRecognizer* g in view.gestureRecognizers)
{
NSLog(#"base view gr=%# gr_view=%#",NSStringFromClass ([g class]),g.view);
}
for (UIView* sub in view.subviews) {
NSLog(#"%#.subview=%#",NSStringFromClass ([view class]),NSStringFromClass ([sub class]));
for(UIGestureRecognizer* g in sub.gestureRecognizers)
{
NSLog(#" | gr=%# gr_view=%#",NSStringFromClass ([g class]),g.view);
}
[self debug:sub];
}
}
But the log shows NO ONE gesture recognizer in existing view and it's subviews. I wold like to have access to default app gesture recognizers, how can i do this?
Related
I want use tap gesture and long press gesture together in a view. But my problem is that I can't able to run tap gesture action on tap. But Long press gesture is working fine.
Here is code snippet.
UILongPressGestureRecognizer *longPressGesture=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:#selector(ontappLongPressGesture:)];
longPressGesture.minimumPressDuration=0.6;
longPressGesture.delegate=self;
[cell.view addGestureRecognizer:longPressGesture];
UITapGestureRecognizer *gesture=[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(cellSelected:)];
//[gesture requireGestureRecognizerToFail:longPressGesture]; //I have tried with this line also but not working
gesture.delegate=self;
[cell.view addGestureRecognizer:gesture];
Also I have set delegate method also
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
This method is getting called on long press
- (void)ontappLongPressGesture:(id)sender{
//Long press code here
}
But this method is not getting called on tap
-(void)cellSelected:(id)sender {
//Single tap code here
}
You haven't specified what type of view your putting these gestureRecognizer's on, however since you are calling it "cell", I'm assuming its on a UITableView?
You need to make sure you set the cancelsTouchesInView flag if so:
gesture.cancelsTouchesInView=NO;
You either need to use one of these two ways.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
// test if our control subview is on-screen
if (cell.view.superview != nil) {
if ([touch.view isDescendantOfView:cell.view]) {
// we touched our control surface
return YES; // handle the touch
}
}
return NO; // ignore the touch
}
Here you need to specify the view for which you want the gestureRecognizer.
Or you can also use these lines of code
gesture.cancelsTouchesInView = NO;
longPressGesture.cancelsTouchesInView = NO;
Hope it will help you.
I'm adding in a few UIGestureRecognizers with a target and selector. I'll just talk about one since the other will be the same i'm sure.
I've added a UIPinchGestureRecognizer
UIPinchGestureRecognizer *pinch = [UIPinchGestureRecognizer new];
[pinch addTarget:self action:#selector(pinchGestureDetected:)];
[self.view setMultipleTouchEnabled:YES];
[self.view addGestureRecognizer:pinch];
Now my goal here is to simply call this method once when I receive a pinch gesture. But obvoiusly it continues to call it as the person pinches. I'm using it as part of a page navigation and will be updating the view when a pinch in is detected.
So in my -(void)pinchGestureDetected:(UIPinchGestureRecognizer)pinch method I'll be calling another method. Kinda like ... and this is a little sudo
-(void)pinchGestureDetected:(UIPinchGestureRecognizer)pinch
{
if (pinch.scale > 1) layoutViewWithMoreDetail;
else layoutViewWithLessDetail;
}
So I don't want it to keep calling this method or the layout method will continue to be called. I want one layout / pinch gesture.
Is there a way I can stop detecting the pinch once it has determined the scale?? Something along the way of ...
-(void)pinchGestureDetected:(UIPinchGestureRecognizer)pinch
{
if (pinch.scale > 1)
{
layoutViewWithMoreDetail;
stop receiving pinch gestures till this.gesture is finished;
}
Would I impliment the GestureDelegate??
-(void)pinchGestureDetected:(UIPinchGestureRecognizer)pinch
{
if (pinch.scale > 1 && pinching == NO )
{
layoutViewWithMoreDetail;
pinching = YES;
}
and then in the delegate for Gesture ended ... pinching = NO;
Thanks for any help
UPinchGestureRecognizer is a continuous gesture - use if(pinch.state == UIGestureRecognizerStateBegan) to detect whether or not the event is just now starting.
However, this results in a low threshold for triggering the event. An alternate method is to quicky disable and enable a gesture when it has been triggered to your satisfaction, like so:
-(void)pinchGestureDetected:(UIPinchGestureRecognizer)pinch
{
if (pinch.scale > 1)
{
//do your stuff here
pinch.enabled = NO;
pinch.enabled = YES;
}
}
This is because if you look at the documentation, it states:
enabled
A Boolean property that indicates whether the gesture recognizer is enabled.
#property(nonatomic, getter=isEnabled) BOOL enabled
Discussion
Disables a gesture recognizers so it does not receive touches. The default value is YES. If you change this property to NO while a gesture recognizer is currently recognizing a gesture, the gesture recognizer transitions to a cancelled state.
I need to make a scrollbar always visible on viewDidLoad so that the user can understand that there is content to scroll. I did the following:
[myscrollView flashScrollIndicators];
But then the scrollbars only appear for some time after viewDidLoad and disappear again only to reappear when the user touches the screen..
I need to make scrollbars always visible. How can I do it?
Apple indirectly discourage constantly displaying scroll indicators in their iOS Human Interface Guidelines but guidelines are just guidelines for a reason, they don't account for every scenario and sometimes you may need to politely ignore them.
The scroll indicators of any content views are UIImageView subviews of those content views. This means you can access the scroll indicators of a UIScrollView as you would any of its other subviews (i.e. myScrollView.subviews) and modify the scroll indicators as you would any UIImageView (e.g. scrollIndicatorImageView.backgroundColor = [UIColor redColor];).
The most popular solution appears to be the following code:
#define noDisableVerticalScrollTag 836913
#define noDisableHorizontalScrollTag 836914
#implementation UIImageView (ForScrollView)
- (void) setAlpha:(float)alpha {
if (self.superview.tag == noDisableVerticalScrollTag) {
if (alpha == 0 && self.autoresizingMask == UIViewAutoresizingFlexibleLeftMargin) {
if (self.frame.size.width < 10 && self.frame.size.height > self.frame.size.width) {
UIScrollView *sc = (UIScrollView*)self.superview;
if (sc.frame.size.height < sc.contentSize.height) {
return;
}
}
}
}
if (self.superview.tag == noDisableHorizontalScrollTag) {
if (alpha == 0 && self.autoresizingMask == UIViewAutoresizingFlexibleTopMargin) {
if (self.frame.size.height < 10 && self.frame.size.height < self.frame.size.width) {
UIScrollView *sc = (UIScrollView*)self.superview;
if (sc.frame.size.width < sc.contentSize.width) {
return;
}
}
}
}
[super setAlpha:alpha];
}
#end
Which is originally credited to this source.
This defines a category for UIImageView that defines a custom setter for the alpha property. This works because at some point in the underlying code for the UIScrollView, it will set its scroll indicator's alpha property to 0 in order to hide it. At this point it will run through our category and, if the hosting UIScrollView has the right tag, it will ignore the value being set, leaving it displayed.
In order to use this solution ensure your UIScrollView has the appropriate tag e.g.
If you want to display the scroll indicator from the moment its UIScrollView is visible simply flash the scroll indicators when the view appears .e.g
- (void)viewDidAppear:(BOOL)animate
{
[super viewDidAppear:animate];
[self.scrollView flashScrollIndicators];
}
Additional SO references:
UIScrollView - showing the scroll bar
UIScrollView indicator always show?
Scroll Indicators Visibility
Make scrollbars always visible in uiscrollview
I want to offer my solution. I don't like the most popular variant with category (overriding methods in category can be the reason of some indetermination what method should be called in runtime, since there is two methods with the same selector).
I use swizzling instead. And also I don't need to use tags.
Add this method to your view controller, where you have scroll view (self.categoriesTableView in my case)
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
// Do swizzling to turn scroll indicator always on
// Search correct subview with scroll indicator image across tableView subviews
for (UIView * view in self.categoriesTableView.subviews) {
if ([view isKindOfClass:[UIImageView class]]) {
if (view.alpha == 0 && view.autoresizingMask == UIViewAutoresizingFlexibleLeftMargin) {
if (view.frame.size.width < 10 && view.frame.size.height > view.frame.size.width) {
if (self.categoriesTableView.frame.size.height < self.categoriesTableView.contentSize.height) {
// Swizzle class for found imageView, that should be scroll indicator
object_setClass(view, [AlwaysOpaqueImageView class]);
break;
}
}
}
}
}
// Ask to flash indicator to turn it on
[self.categoriesTableView flashScrollIndicators];
}
Add new class
#interface AlwaysOpaqueImageView : UIImageView
#end
#implementation AlwaysOpaqueImageView
- (void)setAlpha:(CGFloat)alpha {
[super setAlpha:1.0];
}
#end
The scroll indicator (vertical scroll indicator in this case) will be always at the screen.
Update November, 2019
Starting from iOS 13 UIScrollView subclasses are changed. Now scroll indicators are inherited from UIView and has their own private class called _UIScrollViewScrollIndicator. This means, that they are not subclasses of UIImageView now, so old method won't work anymore.
Also we are not able to implement subclass of _UIScrollViewScrollIndicator because it is private class and we don't have access to it. So the only solution is to use runtime. Now to have support for iOS 13 and earlier implement the next steps:
Add this method to your view controller, where you have scroll view (self.categoriesTableView in my case)
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
// Do swizzling to turn scroll indicator always on
// Search correct subview with scroll indicator image across tableView subviews
for (UIView * view in self.categoriesTableView.subviews) {
if ([view isKindOfClass:[UIImageView class]]) {
if (view.alpha == 0 && view.autoresizingMask == UIViewAutoresizingFlexibleLeftMargin) {
if (view.frame.size.width < 10 && view.frame.size.height > view.frame.size.width) {
if (self.categoriesTableView.frame.size.height < self.categoriesTableView.contentSize.height) {
// Swizzle class for found imageView, that should be scroll indicator
object_setClass(view, [AlwaysOpaqueImageView class]);
break;
}
}
}
} else if ([NSStringFromClass(view.class) isEqualToString:#"_UIScrollViewScrollIndicator"]) {
if (view.frame.size.width < 10 && view.frame.size.height > view.frame.size.width) {
if (self.categoriesTableView.frame.size.height < self.categoriesTableView.contentSize.height) {
// Swizzle class for found scroll indicator, (be sure to create AlwaysOpaqueScrollIndicator in runtime earlier!)
// Current implementation is in AlwaysOpaqueScrollTableView class
object_setClass(view, NSClassFromString(#"AlwaysOpaqueScrollIndicator"));
break;
}
}
}
}
// Ask to flash indicator to turn it on
[self.categoriesTableView flashScrollIndicators];
}
Add new class (this is for iOS earlier than 13)
#interface AlwaysOpaqueImageView : UIImageView
#end
#implementation AlwaysOpaqueImageView
- (void)setAlpha:(CGFloat)alpha {
[super setAlpha:1.0];
}
#end
Add these methods somewhere in you code (either the same view controller as in step 1, or to the desired UIScrollView subclass).
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
// Create child class from _UIScrollViewScrollIndicator since it is private
Class alwaysOpaqueScrollIndicatorClass = objc_allocateClassPair(NSClassFromString(#"_UIScrollViewScrollIndicator"), "AlwaysOpaqueScrollIndicator", 0);
objc_registerClassPair(alwaysOpaqueScrollIndicatorClass);
// Swizzle setAlpha: method of this class to custom
Class replacementMethodClass = [self class];
SEL originalSelector = #selector(setAlpha:);
SEL swizzledSelector = #selector(alwaysOpaque_setAlpha:);
Method originalMethod = class_getInstanceMethod(alwaysOpaqueScrollIndicatorClass, originalSelector);
Method swizzledMethod = class_getInstanceMethod(replacementMethodClass, swizzledSelector);
BOOL didAddMethod =
class_addMethod(alwaysOpaqueScrollIndicatorClass,
originalSelector,
method_getImplementation(swizzledMethod),
method_getTypeEncoding(swizzledMethod));
if (didAddMethod) {
class_replaceMethod(alwaysOpaqueScrollIndicatorClass,
swizzledSelector,
method_getImplementation(originalMethod),
method_getTypeEncoding(originalMethod));
} else {
method_exchangeImplementations(originalMethod, swizzledMethod);
}
});
}
#pragma mark - Method Swizzling
- (void)alwaysOpaque_setAlpha:(CGFloat)alpha {
[self alwaysOpaque_setAlpha:1.0];
}
This step creates the subclass of _UIScrollViewScrollIndicator called AlwaysOpaqueScrollIndicator in runtime and swizzle setAlpha: method implementation to alwaysOpaque_setAlpha:.
Do not forget to add
#import <objc/runtime.h>
to the files you've inserted this code. Thanks to #Smartcat for reminder about this
I dont know whether this will work or not. But just a hint for you.
Scrollbar inside the Scrollview is a Imageview. Which is a subview of UIScrollview
So get the Scrollbar Imageview of the UIscrollview. Then try to set that image property hidden to NO or Change Alpha value
static const int UIScrollViewHorizontalBarIndexOffset = 0;
static const int UIScrollViewVerticalBarIndexOffset = 1;
-(UIImageView *)scrollbarImageViewWithIndex:(int)indexOffset
{
int viewsCount = [[yourScrollview subviews] count];
UIImageView *scrollBar = [[yourScrollview subviews] objectAtIndex:viewsCount - indexOffset - 1];
return scrollBar;
}
-(void) viewDidLoad
{
//Some Code
//Get Scrollbar
UIImageView *scrollBar = [self scrollbarImageViewWithIndex: UIScrollViewVerticalBarIndexOffset];
//The try setting hidden property/ alpha value
scrollBar.hidden=NO;
}
Got reference from here
This is Swift version of #Accid Bright's answer:
class AlwaysOpaqueImageView: UIImageView {
override var alpha: CGFloat {
didSet {
alpha = 1
}
}
static func setScrollbarToAlwaysVisible(from scrollView: UIScrollView) {
// Do swizzling to turn scroll indicator always on
// Search correct subview with scroll indicator image across tableView subviews
for view in scrollView.subviews {
if view.isKind(of: UIImageView.self),
view.alpha == 0 && view.autoresizingMask == UIView.AutoresizingMask.flexibleLeftMargin,
view.frame.size.width < 10 && view.frame.size.height > view.frame.size.width,
scrollView.frame.size.height < scrollView.contentSize.height {
// Swizzle class for found imageView, that should be scroll indicator
object_setClass(view, AlwaysOpaqueImageView.self)
break
}
}
// Ask to flash indicator to turn it on
scrollView.flashScrollIndicators()
}
}
One difference is that setting scrollbar is extracted out as a static method.
I'm using an AlertView with a UITextView subview to let users reply to posts in my app, but I want the Reply button of the alert to disable when the user types more than the character limit. Will disabling the alert view button like this get my app rejected, is there a better way to do this?
-(void)textViewDidChange:(UITextView *)textView {
if (!replyAlert) {
return;
}
//character count
replyAlert.title = [NSString stringWithFormat:#"Reply to Post (%i/250)", [textView.text length]];
if ([textView.text length]>=250) {
//disable alert view button
for (UIView* view in [replyAlert subviews])
{
if ([[[view class] description] isEqualToString:#"UIAlertButton"])
{
UIButton *button = (UIButton*)view;
if ([button.titleLabel.text isEqualToString:#"Reply"]) {
//disable
button.enabled = NO;
}
}
}
} else if ([textView.text length]==249) {
//re-enable button if user deleted a character
for (UIView* view in [replyAlert subviews])
{
if ([[[view class] description] isEqualToString:#"UIAlertButton"])
{
UIButton *button = (UIButton*)view;
if ([button.titleLabel.text isEqualToString:#"Reply"]) {
//enable
button.enabled = YES;
}
}
}
}
}
Have a look at this method on the delegate (UIAlertViewDelegate)
- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView
This method will be called each time a user types a character into a text field in the alert view, assuming you are using the UIAlertViewStylePlainTextInput (?). So in this method you could check the length of the text in the text field and return TRUE/FALSE accordingly.
The method is only available in iOS 5.0 or later too which may be an issue if supporting older versions.
If you are adding your own text fields as subviews to the alert view, then this alone is cause for the app to be rejected as it states that the view hierarchy is not to be manipulated. If you are using the text input style alert view out-of-the-box and just navigating the subviews to check the button titles and disable them, I'd be surprised (note this is a subjective opinion) if that caused a rejection of the app.
I want to get a pointer reference to UIKeyboard *keyboard to the keyboard on screen so that I can add a transparent subview to it, covering it completely, to achieve the effect of disabling the UIKeyboard without hiding it.
In doing this, can I assume that there's only one UIKeyboard on the screen at a time? I.e., is it a singleton? Where's the method [UIKeyboard sharedInstance]. Brownie points if you implement that method via a category. Or, even more brownie points if you convince me why it's a bad idea to assume only one keyboard and give me a better solution.
Try this:
// my func
- (void) findKeyboard {
// Locate non-UIWindow.
UIWindow *keyboardWindow = nil;
for (UIWindow *testWindow in [[UIApplication sharedApplication] windows]) {
if (![[testWindow class] isEqual:[UIWindow class]]) {
keyboardWindow = testWindow;
break;
}
}
// Locate UIKeyboard.
UIView *foundKeyboard = nil;
for (UIView *possibleKeyboard in [keyboardWindow subviews]) {
// iOS 4 sticks the UIKeyboard inside a UIPeripheralHostView.
if ([[possibleKeyboard description] hasPrefix:#"<UIPeripheralHostView"]) {
possibleKeyboard = [[possibleKeyboard subviews] objectAtIndex:0];
}
if ([[possibleKeyboard description] hasPrefix:#"<UIKeyboard"]) {
foundKeyboard = possibleKeyboard;
break;
}
}
}
How about using -[UIApplication beginIgnoringInteractionEvents]?
Also, another trick to get the view containing the keyboard is to initialize a dummy view with CGRectZero and set it as the inputAccessoryView of your UITextField or UITextView. Then, get its superview. Still, such shenanigans is private/undocumented, but I've heard of apps doing that and getting accepted anyhow. I mean, how else would Instagram be able to make their comment keyboard interactive (dismiss on swipe) like the Messages keyboard?
I found that developerdoug's answer wasn't working on iOS 7, but by modifying things slightly I managed to get access to what I needed. Here's the code I used:
-(UIView*)findKeyboard
{
UIView *keyboard = nil;
for (UIWindow* window in [UIApplication sharedApplication].windows)
{
for (UIView *possibleKeyboard in window.subviews)
{
if ([[possibleKeyboard description] hasPrefix:#"<UIPeripheralHostView"])
{
keyboard = possibleKeyboard;
break;
}
}
}
return keyboard;
}
From what I could make out, in iOS 7 the keyboard is composed of a UIPeripheralHostView containing two subviews: a UIKBInputBackdropView (which provides the blur effect on whatever's underneath the keyboard) and a UIKeyboardAutomatic (which provides the character keys). Manipulating the UIPeripheralHostView seems to be equivalent to manipulating the entire keyboard.
Discaimer: I have no idea whether Apple will accept an app that uses this technique, nor whether it will still work in future SDKs.
Be aware, Apple has made it clear that applications which modify private view hierarchies without explicit approval beforehand will be rejected. Take a look in the Apple Developer Forums for various developers' experience on the issue.
If you're just trying to disable the keyboard (prevent it from receiving touches), you might try adding a transparent UIView that is the full size of the screen for the current orientation. If you add it as a subview of the main window, it might work. Apple hasn't made any public method of disabling the keyboard that I'm aware of - you might want to use one of your support incidents with Apple, maybe they will let you in on the solution.
For an app I am currently developing I am using a really quick and easy method:
Add this in the header file:
// Add in interface
UIWindow * _window;
// Add as property
#property (strong, nonatomic) IBOutlet UIView * _keyboard;
Then add this code in the bottom of the keyboardWillShow function:
-(void) keyboardWillShow: (NSNotification *) notification {
.... // other keyboard will show code //
_window = [UIApplication sharedApplication].windows.lastObject;
[NSTimer scheduledTimerWithTimeInterval:0.05
target:self
selector:#selector(allocateKeyboard)
userInfo:nil
repeats:NO];
}
This code look for when the keyboard is raised and then allocates the current window. I have then added a timer to allocate the keyboard as there were some issues when allocated immediately.
- (void)allocateKeyboard {
if (!_keyboard) {
if (_window.subviews.count) {
// The keyboard is always the 0th subview
_keyboard = _window.subviews[0];
}
}
}
We now have the keyboard allocated which gives you direct "access" to the keyboard as the question asks.
Hope this helps
Under iOS 8 it appears you have to jump down the chain more than in the past. The following works for me to get the keyboard, although with custom keyboards available and such I wouldn't rely on this working unless you're running in a controlled environment.
- (UIView *)findKeyboard {
for (UIWindow* window in [UIApplication sharedApplication].windows) {
UIView *inputSetContainer = [self viewWithPrefix:#"<UIInputSetContainerView" inView:window];
if (inputSetContainer) {
UIView *inputSetHost = [self viewWithPrefix:#"<UIInputSetHostView" inView:inputSetContainer];
if (inputSetHost) {
UIView *kbinputbackdrop = [self viewWithPrefix:#"<_UIKBCompatInput" inView:inputSetHost];
if (kbinputbackdrop) {
UIView *theKeyboard = [self viewWithPrefix:#"<UIKeyboard" inView:kbinputbackdrop];
return theKeyboard;
}
}
}
}
return nil;
}
- (UIView *)viewWithPrefix:(NSString *)prefix inView:(UIView *)view {
for (UIView *subview in view.subviews) {
if ([[subview description] hasPrefix:prefix]) {
return subview;
}
}
return nil;
}