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UIGestureRecognizer学习笔记
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UIGestureRecognizer?是一個(gè)具體手勢(shì)的基類，提供了較為簡(jiǎn)單的手勢(shì)實(shí)現(xiàn)方式 ?
The concrete subclasses of?UIGestureRecognizer?are the following:
一個(gè)gesture recognizer是針對(duì)一個(gè)特定的view的（包含其subview），用UIView的方法addGestureRecognize：去關(guān)聯(lián)一個(gè)view
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一個(gè)gesture recognizer是不參與UIView的事件響應(yīng)鏈的
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各個(gè)手勢(shì)使用時(shí)的代碼：
UITapGestureRecognizer
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[cpp]?view plaincopy
-?(void)viewDidLoad??{??????[super?viewDidLoad];????????????????UITapGestureRecognizer?*tapGesture?=?[[UITapGestureRecognizer?alloc]?initWithTarget:self?action:@selector(handleGesture:)];??????if?(![tapGesture?respondsToSelector:@selector(locationInView:)])?{??????????[tapGesture?release];??????????tapGesture?=?nil;??????}else?{??????????tapGesture.delegate?=?self;??????????tapGesture.numberOfTapsRequired?=?1;?????????tapGesture.numberOfTouchesRequired?=?1;?????????[self.view?addGestureRecognizer:tapGesture];??????}??}?? ?
[cpp]?view plaincopy
-?(void)handleGesture:(UIGestureRecognizer?*)gestureRecognizer??{??????UIView?*view?=?[gestureRecognizer?view];???????????switch?(gestureRecognizer.state)?{??????????case?UIGestureRecognizerStateEnded:{?????????????NSLog(@"======UIGestureRecognizerStateEnded?||?UIGestureRecognizerStateRecognized");??????????????break;??????????}??????????case?UIGestureRecognizerStateFailed:{?????????????NSLog(@"======UIGestureRecognizerStateFailed");??????????????break;??????????}??????????case?UIGestureRecognizerStatePossible:{?????????????NSLog(@"======UIGestureRecognizerStatePossible");??????????????break;??????????}??????????default:{??????????????NSLog(@"======Unknow?gestureRecognizer");??????????????break;??????????}??????}????}????-?(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer?*)gestureRecognizer{????????????return?YES;??}????-?(BOOL)gestureRecognizer:(UIGestureRecognizer?*)gestureRecognizer?shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer?*)otherGestureRecognizer{??????return?NO;??}????-?(BOOL)gestureRecognizer:(UIGestureRecognizer?*)gestureRecognizer?shouldReceiveTouch:(UITouch?*)touch{??????return?YES;??}?? ?
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UIPinchGestureRecognizer
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[cpp]?view plaincopy
-?(void)viewDidLoad??{??????[super?viewDidLoad];????????????????UIPinchGestureRecognizer?*pinchGesture?=?[[UIPinchGestureRecognizer?alloc]?initWithTarget:self?action:@selector(handleGesture:)];??????if?(![pinchGesture?respondsToSelector:@selector(locationInView:)])?{??????????[pinchGesture?release];??????????pinchGesture?=?nil;??????}else?{??????????pinchGesture.delegate?=?self;??????????[self.view?addGestureRecognizer:?pinchGesture];??????}????}??????-?(void)handleGesture:(UIPinchGestureRecognizer?*)gestureRecognizer??{????????????UIView?*view?=?[gestureRecognizer?view];?????????????????????CGFloat?scale?=?gestureRecognizer.scale;??????NSLog(@"======scale:?%f",?scale);????????????CGFloat?velocity?=?gestureRecognizer.velocity;??????NSLog(@"======scvelocityale:?%f",?velocity);????????????????switch?(gestureRecognizer.state)?{??????????case?UIGestureRecognizerStateEnded:{?????????????NSLog(@"======UIGestureRecognizerStateEnded?||?UIGestureRecognizerStateRecognized");??????????????break;??????????}??????????case?UIGestureRecognizerStateBegan:{?????????????NSLog(@"======UIGestureRecognizerStateBegan");??????????????break;??????????}??????????case?UIGestureRecognizerStateChanged:{?????????????NSLog(@"======UIGestureRecognizerStateChanged");????????????????????????????gestureRecognizer.view.transform?=?CGAffineTransformScale(gestureRecognizer.view.transform,?gestureRecognizer.scale,?gestureRecognizer.scale);??????????????gestureRecognizer.scale?=?1;???????????????????????????break;??????????}??????????case?UIGestureRecognizerStateCancelled:{?????????????NSLog(@"======UIGestureRecognizerStateCancelled");??????????????break;??????????}??????????case?UIGestureRecognizerStateFailed:{?????????????NSLog(@"======UIGestureRecognizerStateFailed");??????????????break;??????????}??????????case?UIGestureRecognizerStatePossible:{?????????????NSLog(@"======UIGestureRecognizerStatePossible");??????????????break;??????????}??????????default:{??????????????NSLog(@"======Unknow?gestureRecognizer");??????????????break;??????????}??????}????}?? ?
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UIRotationGestureRecognizer
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[cpp]?view plaincopy
-?(void)viewDidLoad??{??????[super?viewDidLoad];??????????UIRotationGestureRecognizer?*rotationGesture?=?[[UIRotationGestureRecognizer?alloc]?initWithTarget:self?action:@selector(handleGesture:)];??????if?(![rotationGesture?respondsToSelector:@selector(locationInView:)])?{??????????[rotationGesture?release];??????????rotationGesture?=?nil;??????}else?{??????????rotationGesture.delegate?=?self;????????????????????[self.view?addGestureRecognizer:rotationGesture];??????}??}??????-?(void)handleGesture:(UIRotationGestureRecognizer?*)gestureRecognizer??{??????UIView?*view?=?[gestureRecognizer?view];?????????????????????CGFloat?rotation?=?gestureRecognizer.rotation;??????NSLog(@"===rotation:?%f",?rotation);????????????CGFloat?velocity?=?gestureRecognizer.velocity;??????NSLog(@"======velocity:?%f",?velocity);????????????????????????????switch?(gestureRecognizer.state)?{??????????case?UIGestureRecognizerStateEnded:{?????????????NSLog(@"======UIGestureRecognizerStateEnded?||?UIGestureRecognizerStateRecognized");??????????????break;??????????}??????????case?UIGestureRecognizerStateBegan:{?????????????NSLog(@"======UIGestureRecognizerStateBegan");??????????????break;??????????}??????????case?UIGestureRecognizerStateChanged:{?????????????NSLog(@"======UIGestureRecognizerStateChanged");????????????????????????????gestureRecognizer.view.transform?=?CGAffineTransformRotate(gestureRecognizer.view.transform,?gestureRecognizer.rotation);??????????????gestureRecognizer.rotation?=?0;???????????????????????????break;??????????}??????????case?UIGestureRecognizerStateCancelled:{?????????????NSLog(@"======UIGestureRecognizerStateCancelled");??????????????break;??????????}??????????case?UIGestureRecognizerStateFailed:{?????????????NSLog(@"======UIGestureRecognizerStateFailed");??????????????break;??????????}??????????case?UIGestureRecognizerStatePossible:{?????????????NSLog(@"======UIGestureRecognizerStatePossible");??????????????break;??????????}??????????default:{??????????????NSLog(@"======Unknow?gestureRecognizer");??????????????break;??????????}??????}????}?? ?
UISwipeGestureRecognizer
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[cpp]?view plaincopy
-?(void)viewDidLoad??{??????[super?viewDidLoad];??????????????????????????????UISwipeGestureRecognizer?*swipeGestureRight?=?[[UISwipeGestureRecognizer?alloc]?initWithTarget:self?action:@selector(handleGesture:)];??????if?(![swipeGestureRight?respondsToSelector:@selector(locationInView:)])?{??????????[swipeGestureRight?release];??????????swipeGestureRight?=?nil;??????}else?{??????????swipeGestureRight.delegate?=?self;??????????swipeGestureRight.numberOfTouchesRequired?=?1;????????swipeGestureRight.direction?=?UISwipeGestureRecognizerDirectionRight;????????[self.view?addGestureRecognizer:swipeGestureRight];??????}????????????????UISwipeGestureRecognizer?*swipeGestureLeft?=?[[UISwipeGestureRecognizer?alloc]?initWithTarget:self?action:@selector(handleGesture:)];??????if?(![swipeGestureLeft?respondsToSelector:@selector(locationInView:)])?{??????????[swipeGestureLeft?release];??????????swipeGestureLeft?=?nil;??????}else?{??????????swipeGestureLeft.delegate?=?self;??????????swipeGestureLeft.numberOfTouchesRequired?=?1;????????swipeGestureLeft.direction?=?UISwipeGestureRecognizerDirectionLeft;????????[self.view?addGestureRecognizer:swipeGestureLeft];??????}????????????????UISwipeGestureRecognizer?*swipeGestureUp?=?[[UISwipeGestureRecognizer?alloc]?initWithTarget:self?action:@selector(handleGesture:)];??????if?(![swipeGestureUp?respondsToSelector:@selector(locationInView:)])?{??????????[swipeGestureUp?release];??????????swipeGestureUp?=?nil;??????}else?{??????????swipeGestureUp.delegate?=?self;??????????swipeGestureUp.numberOfTouchesRequired?=?1;????????swipeGestureUp.direction?=?UISwipeGestureRecognizerDirectionUp;????????[self.view?addGestureRecognizer:swipeGestureUp];??????}????????????????UISwipeGestureRecognizer?*swipeGestureDown?=?[[UISwipeGestureRecognizer?alloc]?initWithTarget:self?action:@selector(handleGesture:)];??????if?(![swipeGestureDown?respondsToSelector:@selector(locationInView:)])?{??????????[swipeGestureDown?release];??????????swipeGestureDown?=?nil;??????}else?{??????????swipeGestureDown.delegate?=?self;??????????swipeGestureDown.numberOfTouchesRequired?=?1;????????swipeGestureDown.direction?=?UISwipeGestureRecognizerDirectionDown;????????[self.view?addGestureRecognizer:swipeGestureDown];??????}??}????-?(void)handleGesture:(UISwipeGestureRecognizer?*)gestureRecognizer??{??????UIView?*view?=?[gestureRecognizer?view];???????????????UISwipeGestureRecognizerDirection?direction?=?gestureRecognizer.direction;??????switch?(direction)?{??????????case?UISwipeGestureRecognizerDirectionRight:??????????{??????????????NSLog(@"direction==UISwipeGestureRecognizerDirectionRight");??????????????break;??????????}??????????case?UISwipeGestureRecognizerDirectionLeft:??????????{??????????????NSLog(@"direction==UISwipeGestureRecognizerDirectionLeft");??????????????break;??????????}??????????case?UISwipeGestureRecognizerDirectionUp:??????????{??????????????NSLog(@"direction==UISwipeGestureRecognizerDirectionUp");??????????????break;??????????}??????????case?UISwipeGestureRecognizerDirectionDown:??????????{??????????????NSLog(@"direction==UISwipeGestureRecognizerDirectionDown");??????????????break;??????????}??????????default:??????????????break;??????}??????????????????????switch?(gestureRecognizer.state)?{??????????case?UIGestureRecognizerStateEnded:{?????????????NSLog(@"======UIGestureRecognizerStateEnded?||?UIGestureRecognizerStateRecognized");??????????????break;??????????}??????????default:{??????????????NSLog(@"======Unknow?gestureRecognizer");??????????????break;??????????}??????}????}?? ?
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UIPanGestureRecognizer
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[cpp]?view plaincopy
-?(void)viewDidLoad??{??????[super?viewDidLoad];????????????????UIView?*view?=?[[UIView?alloc]initWithFrame:CGRectMake(0,?0,?100,?100)];??????view.backgroundColor?=?[UIColor?blueColor];??????[self.view?addSubview:view];??????????????????UIPanGestureRecognizer?*panPressGesture?=?[[UIPanGestureRecognizer?alloc]?initWithTarget:self?action:@selector(handleGesture:)];??????if?(![panPressGesture?respondsToSelector:@selector(locationInView:)])?{??????????[panPressGesture?release];??????????panPressGesture?=?nil;??????}else?{??????????panPressGesture.delegate?=?self;??????????panPressGesture.maximumNumberOfTouches?=?NSUIntegerMax;????????????????panPressGesture.minimumNumberOfTouches?=?1;????????[view?addGestureRecognizer:panPressGesture];??????}??}????-?(void)handleGesture:(UIPanGestureRecognizer?*)gestureRecognizer??{??????UIView?*view?=?[gestureRecognizer?view];???????????????????switch?(gestureRecognizer.state)?{??????????case?UIGestureRecognizerStateBegan:{???????????????NSLog(@"======UIGestureRecognizerStateBegan");??????????????break;??????????}??????????case?UIGestureRecognizerStateChanged:{???????????????NSLog(@"======UIGestureRecognizerStateChanged");??????????????????????????????????????????????????????CGPoint?translation?=?[gestureRecognizer?translationInView:self.view];??????????????view.center?=?CGPointMake(gestureRecognizer.view.center.x?+?translation.x,?gestureRecognizer.view.center.y?+?translation.y);??????????????[gestureRecognizer?setTranslation:CGPointMake(0,?0)?inView:self.view];????????????break;??????????}??????????case?UIGestureRecognizerStateCancelled:{???????????????NSLog(@"======UIGestureRecognizerStateCancelled");??????????????break;??????????}??????????case?UIGestureRecognizerStateFailed:{???????????????NSLog(@"======UIGestureRecognizerStateFailed");??????????????break;??????????}??????????case?UIGestureRecognizerStatePossible:{???????????????NSLog(@"======UIGestureRecognizerStatePossible");??????????????break;??????????}??????????case?UIGestureRecognizerStateEnded:{?????????????????????????????????????????????????????NSLog(@"======UIGestureRecognizerStateEnded?||?UIGestureRecognizerStateRecognized");????????????????????????????CGPoint?velocity?=?[gestureRecognizer?velocityInView:self.view];????????????CGFloat?magnitude?=?sqrtf((velocity.x?*?velocity.x)?+?(velocity.y?*?velocity.y));??????????????????????????????????????CGFloat?slideMult?=?magnitude?/?200;????????????????????????????NSLog(@"magnitude:?%f,?slideMult:?%f",?magnitude,?slideMult);??????????????float?slideFactor?=?0.1?*?slideMult;???????????????????????????????????????CGPoint?finalPoint?=?CGPointMake(view.center.x?+?(velocity.x?*?slideFactor),???????????????????????????????????????????????view.center.y?+?(velocity.y?*?slideFactor));????????????????????????????????????????finalPoint.x?=?MIN(MAX(finalPoint.x,?0),?self.view.bounds.size.width);??????????????finalPoint.y?=?MIN(MAX(finalPoint.y,?0),?self.view.bounds.size.height);????????????????????????????[UIView?animateWithDuration:slideFactor*2?delay:0?options:UIViewAnimationOptionCurveEaseOut?animations:^{??????????????????view.center?=?finalPoint;????????????????}?completion:nil];????????????????????????????break;??????????}??????????default:{??????????????NSLog(@"======Unknow?gestureRecognizer");??????????????break;??????????}??????}????}?? ?
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UILongPressGestureRecognizer
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[cpp]?view plaincopy
-?(void)viewDidLoad??{??????[super?viewDidLoad];??????????UILongPressGestureRecognizer?*longPressGesture?=?[[UILongPressGestureRecognizer?alloc]?initWithTarget:self?action:@selector(handleGesture:)];??????if?(![longPressGesture?respondsToSelector:@selector(locationInView:)])?{??????????[longPressGesture?release];??????????longPressGesture?=?nil;??????}else?{??????????longPressGesture.delegate?=?self;??????????longPressGesture.numberOfTapsRequired?=?0;??????????????longPressGesture.minimumPressDuration?=?0.1f;????????????longPressGesture.numberOfTouchesRequired?=?1;???????????longPressGesture.allowableMovement?=?10;????????????????[self.view?addGestureRecognizer:longPressGesture];??????}??}??????-?(void)handleGesture:(UIGestureRecognizer?*)gestureRecognizer??{??????UIView?*view?=?[gestureRecognizer?view];???????????switch?(gestureRecognizer.state)?{??????????case?UIGestureRecognizerStateEnded:{?????????????NSLog(@"======UIGestureRecognizerStateEnded?||?UIGestureRecognizerStateRecognized");??????????????break;??????????}??????????case?UIGestureRecognizerStateBegan:{?????????????NSLog(@"======UIGestureRecognizerStateBegan");??????????????break;??????????}??????????case?UIGestureRecognizerStateChanged:{?????????????NSLog(@"======UIGestureRecognizerStateChanged");??????????????break;??????????}??????????case?UIGestureRecognizerStateCancelled:{?????????????NSLog(@"======UIGestureRecognizerStateCancelled");??????????????break;??????????}??????????case?UIGestureRecognizerStateFailed:{?????????????NSLog(@"======UIGestureRecognizerStateFailed");??????????????break;??????????}??????????case?UIGestureRecognizerStatePossible:{?????????????NSLog(@"======UIGestureRecognizerStatePossible");??????????????break;??????????}??????????default:{??????????????NSLog(@"======Unknow?gestureRecognizer");??????????????break;??????????}??????}????}????-?(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer?*)gestureRecognizer{??????CGPoint?currentPoint?=?[gestureRecognizer?locationInView:self.view];??????if?(CGRectContainsPoint(CGRectMake(0,?0,?100,?100),?currentPoint)?)?{??????????return?YES;??????}????????????return?NO;??}????-?(BOOL)gestureRecognizer:(UIGestureRecognizer?*)gestureRecognizer?shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer?*)otherGestureRecognizer{??????return?NO;??}????-?(BOOL)gestureRecognizer:(UIGestureRecognizer?*)gestureRecognizer?shouldReceiveTouch:(UITouch?*)touch{??????return?YES;??}??
轉(zhuǎn)載于:https://www.cnblogs.com/Sucri/p/4704933.html
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