iOS gesture Uigesturerecognizer

Uigesturerecognizer is an abstract class that defines the basic behavior of all gestures, and it has 6 subclasses that handle specific gestures:

1.UITapGestureRecognizer (any number of clicks on any finger)

Click Count

Numberoftapsrequired

Number of fingers

Numberoftouchesrequired

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1. UITapGestureRecognizer *tapgesturerecognizer = [[UITapGestureRecognizer alloc] init];
2. [Tapgesturerecognizer addtarget:self Action: @selector (Gesturerecognizerhandle:)];
3. [Tapgesturerecognizer Setnumberoftapsrequired:2];
4. [Tapgesturerecognizer Setnumberoftouchesrequired:2];
5. [Self.view Addgesturerecognizer:tapgesturerecognizer];
6. [Tapgesturerecognizer release];

2.UIPinchGestureRecognizer (two finger kneading action)

Finger pinch, greater than 1 means that the distance between two fingers becomes larger, less than 1 means that the distance between two fingers is smaller

Scale

Rate (acceleration) of finger pinch action

Velocity

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1. Uipinchgesturerecognizer *pinchgesturerecognizer = [[Uipinchgesturerecognizer alloc] init];
2. [Pinchgesturerecognizer addtarget:self Action: @selector (Gesturerecognizerhandle:)];
3. [Self.view Addgesturerecognizer:pinchgesturerecognizer];
4. [Pinchgesturerecognizer release];

3.UIPanGestureRecognizer (shake or drag)

Minimum number of fingers

Minimumnumberoftouches

Maximum number of fingers

Maximumnumberoftouches

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1. Uipangesturerecognizer *pangesturerecognizer = [[Uipangesturerecognizer alloc] init];
2. [Pangesturerecognizer addtarget:self Action: @selector (Gesturerecognizerhandle:)];
3. [Pangesturerecognizer setminimumnumberoftouches:1];
4. [Pangesturerecognizer Setmaximumnumberoftouches:5];
5. [Self.view Addgesturerecognizer:pangesturerecognizer];
6. [Pangesturerecognizer release];

4.UISwipeGestureRecognizer (finger swipe on the screen to manipulate gestures)

Number of sliding fingers

Numberoftouchesrequired

Direction of finger sliding (up,down,left,right)

Direction

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1. Uiswipegesturerecognizer *swipegesturerecognizer = [[Uiswipegesturerecognizer alloc] init];
2. [Swipegesturerecognizer addtarget:self Action: @selector (Gesturerecognizerhandle:)];
3. [Swipegesturerecognizer Setnumberoftouchesrequired:2];
4. [Swipegesturerecognizer Setdirection:uiswipegesturerecognizerdirectionright];
5. [Self.view Addgesturerecognizer:swipegesturerecognizer];
6. [Swipegesturerecognizer release];

5.UIRotationGestureRecognizer (finger rotation on the screen)

Rotation direction, less than 0 counterclockwise rotation gesture, greater than 0 for clockwise gestures

Rotation

Rotation rate

Velocity

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1. Uirotationgesturerecognizer *rotationgesturerecognizer = [[Uirotationgesturerecognizer alloc] init];
2. [Rotationgesturerecognizer addtarget:self Action: @selector (Gesturerecognizerhandle:)];
3. [Self.view Addgesturerecognizer:rotationgesturerecognizer];
4. [Rotationgesturerecognizer release];

6.UILongPressGestureRecognizer (Long press gesture)

Default is 0. The number of full taps required before the press for gesture to be recognized

Numberoftapsrequired

The number of fingers that need to be pressed long

Numberoftouchesrequired

Time required for long press, Min. 0.5s

Minimumpressduration

The distance the finger presses to allow movement

Allowablemovement

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1. Uilongpressgesturerecognizer *longpressgesturerecognizer = [[Uilongpressgesturerecognizer alloc] init];
2. [Longpressgesturerecognizer addtarget:self Action: @selector (Gesturerecognizerhandle:)];
3. [Longpressgesturerecognizer setminimumpressduration:1.0f];
4. [Longpressgesturerecognizer setallowablemovement:50.0];
5. [Self.view Addgesturerecognizer:longpressgesturerecognizer];
6. [Longpressgesturerecognizer release];