I have created custom navigation bar and added one UIButton over it.
Please take a look at image attached.
I have UIButton with background image added as subview to Custom NavigationBar so portion above GREEN line is clickable not the portion below green line.
I have tried using UITapGestureRecognizer and also the touches methods ie. touchesBegan to UIImageView to handle the touch, but no luck.
I think this is only because my UIButton nontouchable potion is outside of NavigationBar Frame.
Is there any way to click the subview's portion which is ouside its parent view.
The parent view size is less than the Child view . That's why it is non clickable. Asper my knowledge only option you have is try to increase the parent view (Custom Navigationbar) frame size .
Yo need subclass Navigation Bar and add method hitTest:withEvent:. For example:
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
CGRect extraTapRect = ...; // Put here needed rect
if (CGRectContainsPoint(extraTapRect, point)) {
for (UIView *subview in self.subviews.reverseObjectEnumerator) {
CGPoint subviewPoint = [subview convertPoint:point fromView:self];
UIView *result = [subview hitTest:subviewPoint withEvent:event];
if (result != nil) {
return result;
}
}
}
return [super hitTest:point withEvent:event];
}
I have a small 320x144viewcontroller named SubViewController.h which has a UITableView in it with 3 cells with a single section. I have made the tableView unscrollable and also put some shadow effect behind the tableView by grace of CALayer.
In another viewcontroller named as MainViewController.m i have added SubViewController.h as a subview to this MainViewController. Using UIPanGestureRecognizer i have successfully able to drag the SubViewContoller anywhere i want.
I make this subView visible with a UIBarButtonItem. And after selecting a cell in the tableView of the subview i made it disappear from main view with some animation.
Everything works fine.
But when i drag the subview and then try to select one cell i have to tap the cell twice. In first tap nothing actually happens except the cell turns blue(like it happens normally when you select a cell in tableView) but does not go Hidden. If i tap again then it will go hidden.
Without dragging the subview i can select one cell with a single touch and also the view goes hidden.
I have written the code for hiding the subview in didSelectRowAtIndexPath: method of the subview. And I have checked this method is not called when i select first time after dragging the subview.In the second tap or touch it is called though. And again if the user moves the subview again same problem occurs.
Surely some property of the subview got changed after dragging which i cant able to figure out.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
NSUInteger tapCount = [touch tapCount];
switch (tapCount) {
case 1:
[self performSelector:#selector(singleTapMethod) withObject:nil afterDelay:.4];
break;
case 2:
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:#selector(singleTapMethod) object:nil];
[self performSelector:#selector(doubleTapMethod) withObject:nil afterDelay:.4];
break;
. . .
}
First when u want your subView to be shown ,that is on click of your UIBarButtonItem:
-(IBAction)buttonClick
{
//setup ur view dynamically as you like//
PSview=[[UIView alloc]initWithFrame:CGRectMake(5, 5, 310,450)];
PSview.backgroundColor=[UIColor blackColor];
PSview.alpha=0.8;
[PSview.layer setBorderColor: [[UIColor whiteColor] CGColor]];
[PSview.layer setBorderWidth: 3.0];
PSview.contentMode=UIViewContentModeScaleAspectFill;
PSview.clipsToBounds=YES;
[PSview.layer setBorderColor: [[UIColor whiteColor] CGColor]];
[PSview.layer setBorderWidth: 3.0];
[PSview addSubview:subView];
[self.view addSubview:PSview];
}
then later :
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//since there are two tables in one view, you can differentiate them using if()
if(tableView==subView)
{
// ...ur code . ..
// write your code what needs to happen when you click a row of your subView.
[PSview removeFromSuperview];
}
if(tableView==mainView)
{
// write your code , what happens when user clicks row of the main table
}
}
I have a MapView, Over which i have added a UIView (0, 216, 320, 200) contain 10 UIButtons. This UIView is to work like a menu, and Shows and Hides on a certain button action.
The problem here is, While the Menu is showing, when i tap a button single ime, it works perfectly, but tapping it very quickly multiple times makes the MapView Zoom(Which is under the UIView which contain the button). It means the touch event is passing to MapView.
Detail: Tapping on the button very quickly cause in MapView Zoom, and the Button Action performs when you stop tapping.
How can i prevent that?
What you could do is disable user interaction for the duration of your button's handler. So in the selector do:
-(void)buttonSelector:(id)sender {
_mapView.userInteractionEnabled = NO;
// ... do what your button needs to do
_mapView.view.userInteractionEnabled = YES;
}
Of course, this assumes your button gets the event before the map view... which I think it should because it's on top of the map view.
To handle the rapid tapping, you could create a subclass of UIButton and use the following code:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
_mapView.userInteractionEnabled = NO;
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
_mapView.userInteractionEnabled = YES;
}
In the builder change the class of the UIButton to your subclass. If you debug the touch in the set passed to the touchesEnd method and look at the tapCount, you'll see all your taps have been caught here.
Yes, so the problem was, I was adding UIView as subview over MapView.. I fixed it by adding the UIView as subview on self.view
I have a uiview at the top of the interface (below the status bar) that only the bottom part of it is shown.
Actually, I want to make the red uiview to slide down to be entirely shown by drag such as the notificationcenter in the native iOS and not just by taping a button.
What should I use to "touch and pull down" the uiview so it could be shown entirely ?
No needs to find a workaround of drag-n-drop. An UIScrollView can do it without any performance loss brought by listening on touches.
#interface PulldownView : UIScrollView
#end
#implementation PulldownView
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (!self) {
return self;
}
self.pagingEnabled = YES;
self.bounces = NO;
self.showsVerticalScrollIndicator = NO;
[self setBackgroundColor:[UIColor clearColor]];
double pixelsOutside = 20;// How many pixels left outside.
self.contentSize = CGSizeMake(320, frame.size.height * 2 - pixelsOutside);
// redArea is the draggable area in red.
UIView *redArea = [[UIView alloc] initWithFrame:frame];
redArea.backgroundColor = [UIColor redColor];
[self addSubview:redArea];
return self;
}
// What this method does is to make sure that the user can only drag the view from inside the area in red.
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
if (point.y > height)
{
// Leaving useless touches to the views under it.
return nil;
}
return [super hitTest:point withEvent:event];
}
#end
How to use:
1. Initialize an instance of PulldownView.
2. Add any content you want to display to the instance using [addSubview:].
3. Hide the area in red.
[pulldownView setContentOffset:CGPointMake(0, heightOfTheView - pixelsOutside)];
This is a simple example. You can add any features to it like adding a titled button bar on the bottom of the draggable area to implement click-n-drop, or adding some method to the interface to reposition it by the caller.
Make a subclass of UIView.
Override touchesBegan:withEvent and touchesMoved:withEvent.
In the touchesBegan perhaps make a visual change so the user knows they are touching the view.
In the touchesMoved use
[[touches anyObject] locationInView:self]
and
[[touches anyObject] previousLocationInView:self]
to calculate the difference between the current touch position and the last touch position (detect drag down or drag back up).
Then if you're custom drawing, call [self setNeedsDisplay] to tell your view to redraw in it's drawRect:(CGRect)rect method.
Note: this assumes multiple touch is not used by this view.
Refer to my answer in iPhone App: implementation of Drag and drop images in UIView
You just need to use TouchesBegin and TouchesEnded methods. In that example, I have shown how to use CGPoint, Instead of that you have to try to use setFrame or drawRect for your view.
As soon as TouchesMoved method is called you have to use setFrame or drawRect (not sure but which ever works, mostly setFrame) also take the height from CGPoint.
I have a view with multiple subviews. When a user taps a subview, the subview expands in size to cover most of the screen, but some of the other subviews are still visible underneath.
I want my app to ignore touches on the other subviews when one of the subviews is "expanded" like this. Is there a simple way to achieve this? I can write code to handle this, but I was hoping there's a simpler built-in way.
Hope this help...
[[yourSuperView subviews]
makeObjectsPerformSelector:#selector(setUserInteractionEnabled:)
withObject:[NSNumber numberWithBool:FALSE]];
which will disable userInteraction of a view's immediate subviews..Then give userInteraction to the only view you wanted
yourTouchableView.setUserInteraction = TRUE;
EDIT:
It seems in iOS disabling userInteraction on a parent view doesn't disable userInteraction on its childs.. So the code above (I mean the one with makeObjectsPerformSelector:)will only work to disable userInteraction of a parent's immediate subviews..
See user madewulf's answer which recursively get all subviews and disable user interaction of all of them. Or if you need to disable userInteraction of this view in many places in the project, You can categorize UIView to add that feature.. Something like this will do..
#interface UIView (UserInteractionFeatures)
-(void)setRecursiveUserInteraction:(BOOL)value;
#end
#implementation UIView(UserInteractionFeatures)
-(void)setRecursiveUserInteraction:(BOOL)value{
self.userInteractionEnabled = value;
for (UIView *view in [self subviews]) {
[view setRecursiveUserInteraction:value];
}
}
#end
Now you can call
[yourSuperView setRecursiveUserInteraction:NO];
Also user #lxt's suggestion of adding an invisible view on top of all view's is one other way of doing it..
There are a couple of ways of doing this. You could iterate through all your other subviews and set userInteractionEnabled = NO, but this is less than ideal if you have lots of other views (you would, after all, have to subsequently renable them all).
The way I do this is to create an invisible UIView that's the size of the entire screen that 'blocks' all the touches from going to the other views. Sometimes this is literally invisible, other times I may set it to black with an alpha value of 0.3 or so.
When you expand your main subview to fill the screen you can add this 'blocking' UIView behind it (using insertSubview: belowSubview:). When you minimize your expanded subview you can remove the invisible UIView from your hierarchy.
So not quite built-in, but I think the simplest approach. Not sure if that was what you were thinking of already, hopefully it was of some help.
Beware of the code given as solution here by Krishnabhadra:
[[yourSuperView subviews]makeObjectsPerformSelector:#selector(setUserInteractionEnabled:) withObject:[NSNumber numberWithBool:FALSE]];
This will not work in all cases because [yourSuperView subviews] only gives the direct subviews of the superview. To make it work, you will have to iterate recursively on all subviews:
-(void) disableRecursivelyAllSubviews:(UIView *) theView
{
theView.userInteractionEnabled = NO;
for(UIView* subview in [theView subviews])
{
[self disableRecursivelyAllSubviews:subview];
}
}
-(void) disableAllSubviewsOf:(UIView *) theView
{
for(UIView* subview in [theView subviews])
{
[self disableRecursivelyAllSubviews:subview];
}
}
Now a call to disableAllSubviewsOf will do what you wanted to do.
If you have a deep stack of views, the solution by lxt is probably better.
I would do this by putting a custom transparent button with the same frame as the superView. And then on top of that button I would put view that should accept user touches.
Button will swallow all touches and views behind it wouldn't receive any touch events, but view on top of the button will receive touches normally.
Something like this:
- (void)disableTouchesOnView:(UIView *)view {
UIButton *ghostButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, view.frame.size.width, view.frame.size.height)];
[ghostButton setBackgroundColor:[UIColor clearColor]];
ghostButton.tag = 42; // Any random number. Use #define to avoid putting numbers in code.
[view addSubview:ghostButton];
}
And a method for enabling the parentView.
- (void)enableTouchesOnView:(UIView *)view {
[[view viewWithTag:42] removeFromSuperview];
}
So, to disable all views in the parentViev behind yourView, I would do this:
YourView *yourView = [[YourView alloc] initWithCustomInitializer];
// It is important to disable touches on the parent view before adding the top most view.
[self disableTouchesOnView:parentView];
[parentView addSubview:yourView];
Just parentView.UserInteractionEnabled = NO will do the work.
Parent view will disable user interaction on all the view's subviews. But enable it does not enable all subviews(by default UIImageView is not interactable). So an easy way is find the parent view and use the code above, and there is no need to iterate all subviews to perform a selector.
Add a TapGestureRecognizer to your "background view" (the translucent one which "grays out" your normal interface) and set it to "Cancels Touches In View", without adding an action.
let captureTaps = UITapGestureRecognizer()
captureTaps.cancelsTouchesInView = true
dimmedOverlay?.addGestureRecognizer(captureTaps)
I will give my 2 cents to this problem.
Iteratively run userInteractionEnabled = false it's one way.
Another way will be add a UIView like following.
EZEventEater.h
#import <UIKit/UIKit.h>
#interface EZEventEater : UIView
#end
EZEventEater.m
#import "EZEventEater.h"
#implementation EZEventEater
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.backgroundColor = [UIColor clearColor];
self.userInteractionEnabled = false;
}
return self;
}
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
//EZDEBUG(#"eater touched");
}
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
}
- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
}
In your code you add the EZEventEater view to cover all the views that your may block the touch event.
Whenever you want to block the touch event to those views, simply call
eater.userInteractionEnabled = YES;
Hope this helpful.
In Swift 5, I achieved this behaviour by placing a view right on top(the highlighted one) and setting:
myView.isUserInteractionEnabled = true
This does not let the touches go through it, thus ignoring the taps.
For my app, I think it will be sufficient to disable navigation to other tabs of the app (for a limited duration, while I'm doing some processing):
self.tabBarController.view.userInteractionEnabled = NO;
Also, I disabled the current view controller--
self.view.userInteractionEnabled = NO;
(And, by the way, the recursive solutions proposed here had odd effects in my app. The disable seems to work fine, but the re-enable has odd effects-- some of the UI was not renabled).
Simple solution. Add a dummy gesture that does nothing. Make it reusable by adding it to an extension like this:
extension UIView {
func addNullGesture() {
let gesture = UITapGestureRecognizer(target: self,
action: #selector(nullGesture))
addGestureRecognizer(gesture)
}
#objc private func nullGesture() {}
}
setUserInteractionEnabled = NO on the view you want to disable
I had the same problem, but the above solutions did not help.
I then noticed that calling
super.touchesBegan(...) was the problem.
After removing this the event was only handled by the top-most view.
I hope this is of help to anybody.