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The four tap methods do nothing more in this application than set one of the four labels and use performSelector:withObject:afterDelay: to erase that same label after 1.6 seconds. The eraseMe: method erases any text field that is passed into it.

Figure 15-41. Entering a new issue The item will be added to the Issues list and the workflow will be activated. The workflow will start by generating a task in the Tasks list. Go to the Tasks list and you should see a new task, as shown in Figure 15-42.

Down in touchesBegan:withEvent:, we call the four tap methods whenever we detect the appropriate number of taps. That s easy enough, so compile and run. If you double-tap, you ll see two labels displayed. If you quadruple-tap, you ll see four labels. In some situations, this might be OK, but usually, you want to take actions based on the number of taps that the user ended up doing. Notice, that we don t implement touchesEnded:withEvent: or touchesMoved:withEvent: in this program. We don t get notified that the user has stopped tapping, which creates a bit of a conundrum for us. Fortunately, there s an easy way to handle it. You re already familiar with the method performSelector:withObject:afterDelay:, which allows us to call a method at some point in the future. Another method allows us to cancel those future calls. It s an NSObject class method called cancelPreviousPerformRequestsWithTarget: selector:object:. This method will stop any pending perform requests that match the arguments passed into it, and it will help us solve our tap conundrum. In TapTapsViewController.m, replace the touchesBegan:withEvent: method with this new version:

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- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; NSUInteger tapCount = [touch tapCount]; switch (tapCount) { case 1: [self performSelector:@selector(singleTap) withObject:nil afterDelay:.4]; break; case 2: [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(singleTap) object:nil]; [self performSelector:@selector(doubleTap) withObject:nil afterDelay:.4]; break; case 3: [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(doubleTap) object:nil]; [self performSelector:@selector(tripleTap) withObject:nil afterDelay:.4]; break; case 4: [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(tripleTap)

To gain access to any discussion list, you just need to subscribe it. Subscribing is quite easy. Just send a new e-mail message to command@lists.myitforum.com. In the body of the message, type Subscribe, followed by the name of the list (see Table 8-1). For example, to subscribe to the SMS list, enter Subscribe: mssms into the body of the e-mail message. Be sure to leave the subject line blank. You may manage all of your subscriptions this way, by sending commands to the list server. Some other e-mail body commands that you can use are listed in Table 8-2.

Note The workflow runs in the background, and depending on other activity on the server, the workflow may be suspended for a while. If the task does not appear immediately, just a wait a few seconds and refresh the page.

object:nil]; [self quadrupleTap]; break; default: break; } }

In this version, every time we detect a number of taps, instead of calling the corresponding method immediately, we use performSelector:withObject:afterDelay: to call it four-tenths of a second in the future, and we cancel the perform request done by our method when the previous tap count was received. So, when we receive one tap, we call the singleTap method four-tenths of a second in the future. When we receive notification of a double-tap, we cancel the call to singleTap and call doubleTap four-tenths of a second in the future. We do the same thing with triple-taps and quadruple-taps so that only one of the four methods gets called for any particular tap sequence. Compile and run this version, and when you double-, triple-, or quadruple-tap, you should only see one label displayed.

Edit this task and select the Assign action. Enter a user on the PeoplePicker control and set the priority as shown in Figure 15-43. Click the Save button.

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