SwiftUI iOS - Adding Double tap cause Single tap called after a delay - swift

Question

I want to recognize Single tap and Double tap on the Capsule below. This code works fine :
Capsule()
.frame(width: 100, height: 42)
.onTapGesture(count: 1) {
print("Single Tap recognized instantly")
}
But When I'm adding the .onTapGesture(count: 2) to it Single tap called after 0.25ms.
Capsule()
.frame(width: 100, height: 42)
.onTapGesture(count: 2) {
print("Double tap recognized instantly")
}
.onTapGesture(count: 1) {
print("Single Tap recognized after 0.25ms")
}
How can I fix this?

Answer 1

Just to make one thing clear: You cannot have a single tap-gesture that should be recognized together with a double tap gesture when your goal is to detect both exclusively (i.e. the system should differentiate between a single tap and a double tap with no delay) since a single tap could theoretically always lead to a double tap. This means you always have to wait a certain period (of 0.25 ms as it seems in your case) to rule out the user intended to double-tap.
However, when your goal is to have a single tap-gesture together (in other words simultaneously) with the double-tap gesture, this is now completely feasible.
A gesture is, like so many things in SwiftUI a protocol and custom gestures can be built in a lot of ways like the body of a view. In your case, we want a double tap-gesture that runs simultaneously with a single tap gesture. The simplest way to this, you declare a computed property with an opaque return type (some Gesture) and describe your gesture in that property:
var tapGesture: some Gesture {
TapGesture(count: 2)
.onEnded {
print("Double tap")
}
.simultaneously(with: TapGesture(count: 1)
.onEnded {
print("Single Tap")
})
}
You can simply add this gesture to whatever view you desire, just like you would do the same thing with any other gesture:
Capsule()
.gesture(tapGesture)