Instance Property

timestamp

The time when the touch occurred or when it was last mutated.

Declaration

@property(nonatomic, readonly) NSTimeInterval timestamp;

Discussion

The value of this property is the time, in seconds since system startup, that the touch originated or was last changed. You can store the value of this property and compare it to the timestamp in subsequent UITouch objects to determine the duration of the touch and, if it is being swiped, the speed of movement. For a definition of the time since system startup, see the description of the systemUptime method of the NSProcessInfo class.

See Also

Getting Touch Attributes

tapCount

The number of times the finger was tapped for this given touch.

type

The type of the touch.

UITouchType

The type of touch received.

phase

The phase of the touch.

UITouchPhase

The phase of a finger touch.

force

The force of the touch, where a value of 1.0 represents the force of an average touch (predetermined by the system, not user-specific).

maximumPossibleForce

The maximum possible force for a touch.

altitudeAngle

The altitude (in radians) of the stylus.

- azimuthAngleInView:

Returns the azimuth angle (in radians) of the stylus.

- azimuthUnitVectorInView:

Returns a unit vector that points in the direction of the azimuth of the stylus.