IOS gestures Encyclopedia

1. Touch Event

System calls automatically

A uitouch represents a finger, hold option, and turn two fingers.

Although it is two fingers, it only performs a touch event

-(void) Touchesbegan: (Nsset *) touches withevent: (Uievent *) event {} start touch events

-(void) touchesmoved: (Nsset *) touches withevent: (Uievent *) event {} finger move events

-(void) touchesended: (Nsset *) touches withevent: (Uievent *) event {} End touch time

-(void) touchescancelled: (Nsset *) touches withevent: (Uievent *) event {} Cancel touch gesture

Get any finger

Uitouch * Touch = [touches anyobject];

Finger-touch View

NSLog (@ "touch.view:%@", Touch.view);

Click Count

NSLog (@ "clicks:%ld", Touch.tapcount);

Position of current finger

Cgpoint currentponit = [Touch LocationInView:touch.view];

Where the last finger was located

Cgpoint previousponit = [Touch PreviousLocationInView:touch.view];

2. Event Distribution

The process of generating and passing events:

When a touch event occurs, it is passed to UIApplication, which receives the event in the queue structure. Passed to the main window, the main window passed to the controller's UIView, traversing the UIView sub-view, looking for the most appropriate uiview to receive.

Responder chain:

The upper level of the class if it is UIView, the child view handles the event, and if it can't handle it, look for his parent view.

The upper level of the class, if Uiviewcontroller, is handled by the owning controller.

Return to the most appropriate UIView

-(UIView *) HitTest: (cgpoint) point withevent: (Uievent *) event {}

Judging the current point is not on the view

-(BOOL) Pointinside: (cgpoint) point withevent: (Uievent *) Event {

return YES;

}

3. Uiimageview Click event

self.imageView.userInteractionEnabled = NO;

3 scenarios in which an event cannot be responded to:

1. When userinteractionenabled is not turned on

2. When the Hidden property is Yes

3, when the Alpha property is 0 o'clock

Converts a point in a yellowview coordinate system to a point with a button as a coordinate system self = Yellowview

Cgpoint buttonpoint = [self convertpoint:point ToView:self.button];

The purpose of this function is to determine whether the point of the current click or touch event is in the current view.

It is hittest:withevent: called ,

-(BOOL) Pointinside: (cgpoint) point withevent: (Uievent *) event; Default returns YES if point was in bounds

4, mobile phone shake a shake

Types of events

-(void) Motionbegan: (uieventsubtype) Motion withevent: (Nullable Uievent *) event {

if (motion = = Uieventsubtypemotionshake) {

NSLog (@ "Shake");

}

}

5. **gesture gestures

Uigesturerecognizerstate:

Start: Uigesturerecognizerstatebegan

Change: uigesturerecognizerstatechanged

Ends: uigesturerecognizerstateended

Cancel: uigesturerecognizerstatecancelled

Failure: uigesturerecognizerstatefailed,

Use two gestures to pinch and rotate

-(BOOL) Gesturerecognizer: (Uigesturerecognizer *) Gesturerecognizer Shouldrecognizesimultaneouslywithgesturerecognizer: (Uigesturerecognizer *) Othergesturerecognizer {

return YES;

}

(1) Tap gesture Tap

UITapGestureRecognizer * Tap1 = [[UITapGestureRecognizer alloc] initwithtarget:self action: @selector (TapAction1:)];

Click once to trigger

tap1.numberoftapsrequired = 1;

[Self.imageview ADDGESTURERECOGNIZER:TAP1];

UITapGestureRecognizer * TAP2 = [[UITapGestureRecognizer alloc] initwithtarget:self action: @selector (TapAction2:)];

Double-click once to trigger

tap2.numberoftapsrequired = 2;

[Self.imageview ADDGESTURERECOGNIZER:TAP2];

If TAP2 executes successfully, let TAP1 fail

[Tap1 REQUIREGESTURERECOGNIZERTOFAIL:TAP2];

(2) long press gesture longpressUilongpressgesturerecognizer * longgesture = [[Uilongpressgesturerecognizer alloc] initwithtarget:self action:@ Selector (longaction:)];

[Self.imageview Addgesturerecognizer:longgesture];

(3) Swipe gesture Swipe

Uiswipegesturerecognizer * swipegesture = [[Uiswipegesturerecognizer alloc] initwithtarget:self action: @selector ( Swipeaction:)];

Set the swipe direction

Swipegesture.direction = Uiswipegesturerecognizerdirectionleft;

[Self.imageview Addgesturerecognizer:swipegesture];

(4) kneading event Pinch

Uipinchgesturerecognizer * pinchgesture = [[Uipinchgesturerecognizer alloc] initwithtarget:self action: @selector ( Pinchaction:)];

Pinchgesture.delegate = self;

[Self.imageview Addgesturerecognizer:pinchgesture];

Self.pin = pinchgesture;

corresponding events

-(void) Pinchaction: (Uipinchgesturerecognizer *) pin {

Self.imageView.transform = Cgaffinetransformscale (Self.imageView.transform, Pin.scale, Pin.scale);

Reset

Pin.scale = 1;

}

(5) Rotating event Rotation

Uirotationgesturerecognizer * rotationgesture = [[Uirotationgesturerecognizer alloc] initwithtarget:self action:@ Selector (rotationaction:)];

Rotationgesture.delegate = self;

[Self.imageview Addgesturerecognizer:rotationgesture];

corresponding events

-(void) Rotationaction: (Uirotationgesturerecognizer *) Rotation {

Self.imageView.transform = Cgaffinetransformrotate (Self.imageView.transform, rotation.rotation);

Reset

rotation.rotation = 0;

}

(6) Drag gestures Pan

Uipangesturerecognizer * pangesture = [[Uipangesturerecognizer alloc] initwithtarget:self action: @selector (panaction :)];

[Self.imageview Addgesturerecognizer:pangesture];

corresponding events

-(void) Panaction: (Uipangesturerecognizer *) Pan {

Gets the offset of the drag

Cgpoint ponit = [Pan TranslationInView:self.view];

Self.imageView.center = Cgpointmake (self.imageview.center.x + ponit.x, self.imageview.center.y + ponit.y);

Reset

[Pan Settranslation:cgpointzero InView:self.imageView];

}

IOS gestures Encyclopedia