Check multi-keys press
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last edited byHi, i tried to use objc
UIViewControllerto get key press with text field, but the problem is, if i press left arrow key first, and then press right arrow key, the right arrow key’sCustomViewController_pressesBegan_withEvent_will not triggered, pls help?
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last edited by@cvp i dont think that that def was called :(
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last edited by@yaley but do you really need it? The doc says it is called if you change something in your key press, like force. If you know which key is down and up, and when, you have all you need, haven't you?
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last edited byYep! Maybe…. No need!
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last edited by yaley@cvp But the main problem is just when arrow keys will happen, just like umm i give you an example:
I am detecting keys withui.Textfield()And now i start pressing left arrow key. So in the input it goes left ( the selection bar ), but if the right arrow keys joined the right arrow key, the selection bar of input still goes left.
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last edited by yaleyAnd, also, can
vi.View().get_key_commands()andui.View().key_command(sender)detect keyup? if can, then i can make
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last edited by@cvp can it?
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This post is deleted!last edited by
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last edited by@yaley sorry, was driving to France for some days, not able to answer
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last edited by
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last edited byThere are four methods you can implement:
https://developer.apple.com/documentation/uikit/uiresponder/1621134-pressesbegan?language=objc
You also have pressesEnded_withEvent_, and pressesChanged_withEvent_. Technically, pressesCancelled_withEvent_, but that's rare.
You can inspect the modifiers:
UIKeyModifierAlphaShift 1<<16
A modifier flag that indicates the user pressed the Caps Lock key.
UIKeyModifierShift 1<<17
A modifier flag that indicates the user pressed the Shift key.
UIKeyModifierControl 1<<18
A modifier flag that indicates the user pressed the Control key.
UIKeyModifierAlternate 1<<19
A modifier flag that indicates the user pressed the Option key.
UIKeyModifierCommand 1<<20
A modifier flag that indicates the user pressed the Command key.
UIKeyModifierNumericPad 1<<21
A modifier flag that indicates the user pressed a key located on the numeric keypadAlso, to check for special characters, you would look at charactersIgnoringModifiers, and check for special strings from https://developer.apple.com/documentation/uikit/uikeycommand/input_strings_for_special_keys?language=objc
for example 'UIKeyInputRightArrow'
(Convert to str before comparing).
Technically, when looking at apple docs, in this case then consts are defined as NSString *, so the way you get the value is
ObjCInstance(c_void_p.in_dll(c, 'UIKeyInputRightArrow'))But in this case, the NSString is simply equal to the constant name.
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last edited by yaley@JonB so….. what should i change?
