Handling Tap and Double Tap

I'm following the example code in the iPhone OS Programming Guide for dealing with the complication of having your application handle both single taps and double taps in different ways under the section on Handling Multi-Touch events.
I'm running into a scenario where both a single tap and a double tap are registered as part of an attempted double tap. It seems to be an issue with timing. It seems that even though the cancelPreviousPerformRequestsWithTarget gets called on the delayed single tap gesture that it is too late and it fires anyways and then it still goes on to register the double tap also.
This seems to happen only if the timing is exactly right. A fast double tap and it works fine. A double tap slower than the performSelector withObject afterDelay for the first tap and it only registers the single tap as expected. However, the issue seems to occur is the the timing in between the two taps is exactly the the same as the single tap delay (.2 seconds is what I'm using).
Has anyone else run into this and found a solution, or am I doing something wrong perhaps?
Thanks,
-Keith

I think I found my problem. The first touch and the second touch were on separate pieces of my game board. So I was calling perform action with delay on the first, but canceling it on the object under the second touch. That is why the cancel message was not going through.
Thanks,
-Keith

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Dear All,
I have a MBP A1226 model with intel 2.2 GHz Core 2 uo processor. With Mac OSX ver 10.8.4.
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Regards

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udi = '/org/freedesktop/Hal/devices/platform_i8042_i8042_AUX3_port_logicaldev_input'
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Ummm..I can't work out the 'Quotes' and how to do them on this forum board..so I'll just use bold and different fonts.
But you mis understand my question...
Here is part of my original post
I could double tap the home icon when a dialogue box was open
Implying that the dialogue box is already open BEFORE I use the double tap function.
As I go on to further explain, this dialogue box could be from either WiFi asking for a password, or Mail asking for a password, or Mail telling me it can't connect to the Server.
When you have 8 e-mail accounts and you have to hit OK or Cancel twice per e-mail account..before you can close the app...it is more than frustrating. ..all these multiple dialogue or warning boxes and you can't get out of them without acknowledging each of them. You used to be able to Double tap, and Swipe the preview up to close the app..or jump to another app.
I understand this perfectly, what you said:
Double clicking the home button shows the recently opened app icons along the bottom of the screen with a preview above each icon. To open one of the apps, touch the icon and the app opens. Copy what you want, double click, open the the other app, then paste. The preview screens are used to close the apps by slideng the screens up. See this:
..and that is what I am trying to do. But when one of these Mail or Wif bode Dialogues or warnings are open the double tap is not possible..it does not work. so you can't go to the other app to copy and paste. or slide the preview screen up to close it.

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#8 External Monitor Viewing.
Shane's Stock Answer #8:
A simple path is mac > firewire > camera or deck > rca cables > tv
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Trackpad double tap is terrible

Has anyone else noticed the trackpad double tap to not work correctly?
I've pretty much given up when it comes to double tapping and resorted back to the button to double click.
It's getting pretty annoying, especially when I have to double click a bookmark out of the bookmark collection.

Try resetting Parameter memory (PRAM). If your PRAM contents are wrong, all sorts of odd hardware-ish problems can result.
I presume you have also tried adjusting the trackpad settings in System Preferences, correct?
Trackpad tapping, double-tapping, and double-tap with drag all seem to work fine on the Macs I'm using.
--Bob

Ipod nano 7th generation having issues with the UI. Out of box everything worked great. Once I snyc the device and it finished, the UI becomes unuesable. You have to double tap every icon in order to open music, videos, etc. I cannot swipe to the second

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It would seem that Voiceover has been enabled on your iPod Nano. The following article contains information regarding Voiceover, and how to disable it once it's been enabled.
iPod nano (6th generation and later): How to use VoiceOver
http://support.apple.com/kb/HT4317
To turn off VoiceOver on iPod nano using VoiceOver gestures
From the Home Screen, swipe right or left with two fingers until you see or hear "Page 2 of 2" on iPod nano (7th generation) or "Settings" on iPod (6th generation).
If the icons have been rearranged, or if there are more than four Home screens, you may hear something different.
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Double-tap to open Settings.
Slide your finger up or down the screen until you see or hear General, then double- tap.
Slide your finger up or down the screen until you see or hear Accessibility, then double-tap.
Slide your finger up or down the screen until you see or hear VoiceOver, then double-tap.
Double-tap when you hear "VoiceOver switch button on."
You'll hear "VoiceOver off" to confirm the setting. Now you can use standard gestures to control iPod nano.
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Can double tap action override table view tap functionality?

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Here's the best info I've found on this topic so far: [http://idevkit.com/forums/general-sdk/43-custom-uitableview-double-tap.html]. It looks like the author has read Handling Single and Multiple Tap Gestures in the +iPhone Application Programming Guide+ and has overcome most of the problems, but I haven't tried any of that code myself yet.

Tap & Double Tap.

Hi,
I know that a lot of threads are opend for this problem but yet, I haven't found a solution for this problem.
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
// We only support single touches, so anyObject retrieves just that touch from touches
UITouch *touch = [[event allTouches] anyObject];
if ([touch tapCount] == 2) {
//Do A
// In case of a double tap outside the placard view, update the placard's display string
else if ([touch tapCount] == 1) {
//DO B
The problem is, if i double tap, the B function is executed also.
I found this thread:
http://www.iphonedevsdk.com/forum/iphone-sdk-development/2108-single-touch-event -always-get-fired-double-touch.html
and he said there that this is the behavior... what does he means ?
95% of all the posts use the 'tapCount'.
I've even try to use:
UIControlEventTouchDownRepeat & UIControlEventTouchUpInside, with IBActions, and always the UIControlEventTouchUpInside call first...
How do i handle ONLY double tap ?
Thanks.

If you ONLY want double tap events then ignore single taps.
If you want both to work single and double taps to work you'll have to wait a given amount of time and see if the user has tapped again.
The Programming guide has a starting point code snippet for this.

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Hello:
Could some kind person possibly help a Mac newb?
For some strange reason, I am unable to Double Tap using *either* my TrackPad or Bluetooth Mouse immediately after upgrading my Mid 2011 iMac from OS X 10.6.8 to 10.8.2. Single tapping on any file highlights the file name and double tapping the file name (not the icon) allows renaming the file (which I believe is all normal). All other gestures appear to function normally - just can't double-tap TrackPad or double-click the Mouse.
ALREADY TRIED:
Shutting down and removing all power cords and cables to the computer.
Removing the batteries from TrackPad & Mouse.
Creating a new user account.
Reinstalling OS X 10.8.2 including updates 3 times.
Booting into Safe Mode then running Disk Utility to Repair Disk Permissions and Repair Disk.
Running Capture_Data.dmg and sending the files to Apple Support.
Apple Senior Advisor said that their Software Engineer did not notice anything out of the ordinary, but is now digging deeper.
Deleted com.apple.Bluetooth.plist & com.apple.PowerManagement.plist per Apple.
Cleared browser cache & history, then emptied trash.
I am currently working with a Senior Advisor at Apple since 02.01.2013 (10 days) to follow-up on the same issue as a previous case opened on 01.14.2013 after upgrading the OS X on 01.12.2013. Apple originally suggested that I take my iMac to the Apple Store for diagnostic testing, which I have avoided because everything was working fine before the upgrade and then I noticed the same issue with the my mouse. I decided to hold off wiping the system clean, doing a clean install then migrating my data and settings from the backup until my Apple Advisor tells me if their Software Engineer discovers anything else after they dig a little deeper into the diagnostic report. But that could take weeks and right clicking to open files is getting old real fast. Besides, my Adobe CS6 apps rely heavily (if not entirely) on double & triple clicks, so I am paralyzed from using any of their products.
Since Apple said they have no reported cases like this, I have done a lot of digging on my own before writing this. Sorry about the long post, but I was hoping to provide as much detail as possible to be respectful of everyones valuable time. Any help or suggestions would be greatly appreciated.
Regards,
Doug Klimek

Problem Solved in less than 5 minutes - Thank you Travis @ AppleCare!
SOLUTION:
Set the Mouse & Trackpad Double-Click speed to any value other than "Fast". The slider bar has 10 settings (1=Slow to 10=Fast) so I set mine to 9 and it works fine. But your system may respond differently, so you might want to start with #5 (Middle) and go from there. FWIW, the #10 setting (Fast) does work, however I had to use one finger on each hand because I couldn't tap fast enough with only one hand.
HERE'S WHAT TO DO:
Click the Apple Logo > System Preferences > System > Accessibility > Mouse & Trackpad > Double-click speed > Drag slider to the #5 setting (Middle of bar) then tweak to your liking
FYI ONLY:
FWIW, I had no Double-Click problems when setting the Mouse & Trackpad Tracking to #10 (Fast) as long as the Double-Click speed (above) was set to any value other than #10 (Fast). I am only mentioning this to share what I learned.
Click the Apple Logo > System Preferences > Hardware > Mouse > Point & Click > Tracking > Drag slider bar to your liking
Click the Apple Logo > System Preferences > Hardware > Trackpad > Point & Click > Tracking Speed > Drag slider bar to your liking
Hope this information is helpful to anyone before consider wiping their disk clean and doing a fresh M/L reinstall like i almost did.

Handling Tap and Double Tap

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