I need to implement long and short press for one button. how to go about with it. I implemented long press using longPressGestureRecognizer .. now i dont know how to do the same for short press.. its like for short press it has to load view1 and for long view2.
thank you.
By short press I assume you mean a tap on the button. If you are using a nib you can connect the button action event for touch or touch up inside to an IBAction. If not you can use addTarget:action:forControlEvents detailed here:
http://developer.apple.com/library/ios/documentation/UIKit/Reference/UIControl_Class/Reference/Reference.html#//apple_ref/occ/instm/UIControl/addTarget:action:forControlEvents:
If you decide not to use a button or not to use the UIControl methods, you can attach a UITapGestureRecognizer to the same view with a different target action.
Related
I am trying to figure out how to only display a label while a button is pressed in OS. I know how to operate the touch events but I am not sure how to incorporate the UILongPressGestureRecognizer into this.
The UIButton class, as well as lots of other UIControl subclasses can have numerous actions hooked up to them.
When we are hooking up an action from interface builder to our source code file, if we open the "Event" drop down, we're presented with a long list of options:
In almost every scenario, we're hooking our actions only up to "Touch Up Inside". This allows the user to consider whether or not they want to really press the button. If they drag their finger off the button before letting go, the action doesn't fire, because the "up touch" gesture happened outside the bounds of the object.
But here, we want to actually hook our button's "touch down" event up. This is when we'll display the label.
Let's go ahead and create a "touch down" event and a "touch up inside" event:
Swift
#IBAction func buttonTouchDown(sender: UIButton) {
self.myLabel.hidden = false
}
#IBAction func buttonTouchEnded(sender: UIButton) {
self.myLabel.hidden = true
}
Objective-C
- (IBAction)buttonTouchDown:(UIButton *)sender {
self.myLabel.hidden = NO;
}
- (IBAction)buttonTouchEnded:(UIButton *)sender {
self.myLabel.hidden = YES;
}
So far, buttonTouchEnded is set up completely normally, and buttonTouchDown was set up by selecting "touch down" from the "Event" list.
We can always verify what our control is hooked up to by right clicking it in the interface builder:
But this menu is useful for more than simply checking what we've already hooked up. From here, we can hook up any of the other actions to our existing #IBAction methods simply by clicking in the circle and dragging to the existing method.
So we obviously want the label to disappear if we stop pressing the button, a normal touch up like you'd hook up any other button. The only question remaining is, what exact behavior do you want?
If you want the label to disappear only when the finger is lifted, no matter where the finger goes, then we must also hook up "touch up outside".
If you want the label to disappear when the user drags their finger off the button, then we should hook up the "touch drag exit" action.
We also probably want to hook up the "touch cancel" action, which would occur if some sort of system event (perhaps an incoming phone call) cancels the touch.
This Stack Overflow answer elaborates on the differences between the action options we have, so you can craft the behavior exactly how you need it.
Anyway, once we decide which actions we want to hook up to which methods, bring up that right click menu and click-drag from the circles to the methods:
The easiest thing to do would be to add an action to the touchDown event and a separate action to touchUpInside and touchUpOutside.
Show the label on the touchDown action and hide it on the touchUpInside / touchUpOutside action. (and for completeness, on touchCancel, as suggested by nhgrif in his very thorough answer.)
A long press gesture recognizer won't work in this situation. You could create a custom gesture recognizer that triggered one event on touch and another event on release, and use that. It's actually not that hard to do.
EDIT
I just uploaded a demo project to GitHub called "MorphingButton" (link) that I created for another question here on Stack Overflow.
That project now shows a label on touching the app button and hides the label when you release the button.
The project is a hybrid Swift/Objective-C project that shows how to do the button morphing and label showing/hiding in both languages. It has a tab bar with a Swift tab and an Objective-C tab.
What I want to do is just as the tiltle says. The reason is , I am not able to custome the view of the below button, so I plan to put another button on this button which can be customed by myself. And when I touch the upper one, the event of the belown one will be triggered.
Let's say there are two UIButtons A & B.
In the touch event (touchupinside) of A add the following code:
[buttonObjectB sendActionsForControlEvents: UIControlEventTouchUpInside];
This will trigger second button's touch event as you desire.
I'm writing a simple iOS 6.1 game. The game involves pressing buttons (OK, it's a tictactoe board, with the cells being UIButtons). The allows the player to choose whether to go first, or whether the computer should go first. If the player tells the computer to go first, I want to set some values, and then fire off the UIButton just as if the user had pressed it.
How can I post an event, or otherwise simulate the action of the button being pressed, to let the rest of the framework do the work of handling the button press?
If there is a better design approach, where I don't have to pretend that the computer has pressed a button, I'm open to hearing about that, instead.
Thank you
Your button will be connected to an action method, typically in your view controller. Just call that method yourself, passing the button as the sender.
Your method will be something like:
-(IBAction)buttonPressed:(UIButton*)sender
{
// Respond to your button press...
}
You'd call it as follows:
[self buttonPressed:self.whicheverButtonYouLike];
You'd need the buttons defined as outlets for this to work.
I have a UIButton whose IBAction has been setup though XIB file. Following is the IBAction method. When I press button multiple times very quickly, this method gets called only once for the last press. I have to wait little more time between the presses. Is there anything like long press time for UIButton that I can reduce or any other settings to make it responding quicker. This button does the similar job of Keyboard's back button to delete last character. I want it to respond very quick like Keyboard's button does. Thanks.
- (IBAction)deleteButtonPress:(id)sender {
NSLog(#"Click");
if(self.numpadTextFiled.text.length > 0)
self.numpadTextFiled.text = [self.numpadTextFiled.text substringToIndex: [self.numpadTextFiled.text length]-1];
}
Is the button by any chance positioned within a UIScrollView? If so, then touches are delayed?
I am following a book to learn IOs programming. For UIButton, it supposed to have a click action. However I only saw some actions like touch down etc.
Also, want to know why the default action not the "touch down" but "touchUpInside"
I am using XCode 4.3.
click action in iOS is represented but touchUpInside, since click is a mouse event
touchUpInside, means that the user touched down on a button, and then touch up, while he still is on the same button, which is the normal behavior when you want to tap on a button
In storyboard, you can right click on the UIButton and see the list of events available for a UIButton and choose appropriate event based on your requirement.
For a click like action you can use Touch Up Inside event.