iOS Development small feature eight: simple use of gestures (6 types) and Proxy methods

Code:

1 #import "ViewController.h"2 @interfaceViewcontroller () <UIGestureRecognizerDelegate>4@property (Weak, nonatomic) Iboutlet Uiimageview *ImageView;5 @end7 @implementationViewcontroller8- (void) Viewdidload {9 [Super Viewdidload];Ten     //as long as the gesture, the default is relative to the original location, and the default control only support a gesture!! If you want to support multiple gestures, see the proxy method below One //[self setuprotation]; A //[self setuppinch]; - [self setuppan]; - } the  - #pragmaMark-Tap gestures -- (void) Setuptap - { +     //Create a tap gesture -UITapGestureRecognizer *tap =[[UITapGestureRecognizer alloc] initwithtarget:self action: @selector (tap:)]; +     //requires 3 consecutive points to trigger A     //tap.numberoftapsrequired = 3; at     //add a tap gesture to the ImageView - [Self.imageview Addgesturerecognizer:tap]; -     //setting up a point-by-gesture proxy -Tap.Delegate=Self ; - } -  in- (voidTap: (UITapGestureRecognizer *) Tap - { toNSLog (@"%s", __func__); + } -  the #pragmaMark-long-Press gestures * //default trigger two times (start touch half a second, end touch once) $- (void) setuplongpressPanax Notoginseng { -Uilongpressgesturerecognizer *longpress =[[Uilongpressgesturerecognizer alloc] initwithtarget:self action: @selector (longpress:)]; the [Self.imageview addgesturerecognizer:longpress]; +Longpress.Delegate=Self ; A } the  +- (void) Longpress: (Uilongpressgesturerecognizer *) longpress - { $ at the beginning Touch $     if(Longpress.state = =Uigesturerecognizerstatebegan) { -NSLog (@"%s", __func__); -     } the at the end of the touch -     if(Longpress.state = =uigesturerecognizerstateended) {WuyiNSLog (@"%s", __func__); the     } - } Wu  - #pragmaMark-Swipe gestures About- (void) Setupswipe $ { -     //default swipe gesture to right-stroke screen -Uiswipegesturerecognizer *swipeup =[[Uiswipegesturerecognizer alloc] initwithtarget:self action: @selector (swipe:)]; -     //Stroke up ASwipeup.direction =Uiswipegesturerecognizerdirectionup; + [_imageview addgesturerecognizer:swipeup]; the     //a sweep gesture supports only one direction, and if you want to support multiple orientations, you must create multiple -Uiswipegesturerecognizer *swipedown =[[Uiswipegesturerecognizer alloc] initwithtarget:self action: @selector (swipe:)]; $     //Stroke down theSwipedown.direction =Uiswipegesturerecognizerdirectiondown; the [_imageview Addgesturerecognizer:swipedown]; the } the- (void) Swipe: (Uiswipegesturerecognizer *) Swipe - { inNSLog (@"%s", __func__); the } the  About #pragmaMark-Rotate gestures the //The default delivery angle is relative to the beginning of the position the- (void) Setuprotation the { +Uirotationgesturerecognizer *rotation =[[Uirotationgesturerecognizer alloc] initwithtarget:self action: @selector (rotation:)]; -Rotation.Delegate=Self ; the [Self.imageview addgesturerecognizer:rotation];Bayi } the- (void) Rotation: (Uirotationgesturerecognizer *) Rotation the { -     //let the picture rotate with the gesture rotation, the angle of rotation is equal to the value of the initial position, with rotation.rotation = 0; - //self.imageView.transform = cgaffinetransformmakerotation (rotation.rotation); the     //gesture rotation can make the picture rotate the n circle at high speed, and it is not controlled, the direction is not easy to determine. Mating rotation.rotation = 0; The rear angle is always 0 theSelf.imageView.transform =cgaffinetransformrotate (Self.imageView.transform, rotation.rotation);  the     //Reset theRotation.rotation =0; -     //get the angle of the gesture rotation theNSLog (@"%f", rotation.rotation); the } the 94 #pragmaMark-pinch gesture the //two finger zoom to zoom out picture the- (void) Setuppinch the {98Uipinchgesturerecognizer *pinch =[[Uipinchgesturerecognizer alloc] initwithtarget:self action: @selector (pinch:)]; AboutPinch.Delegate=Self ; - [Self.imageview addgesturerecognizer:pinch];101 }102- (void) Pinch: (Uipinchgesturerecognizer *) Pinch103 {104     //The magnification ratio is relative to the original point, note: This cannot be used with Pinch.scale = 1, otherwise it cannot be enlarged the //self.imageView.transform = Cgaffinetransformmakescale (Pinch.scale, pinch.scale);106     //as the distance between the two fingers increases, the picture will quickly zoom in or out irregularly (there is no way to zoom in or out here), note: with Pinch.scale = 1, normal magnification and reduction107Self.imageView.transform =Cgaffinetransformscale (Self.imageView.transform, Pinch.scale, Pinch.scale);108     //Reset109Pinch.scale =1; theNSLog (@"%f", Pinch.scale);111 } the 113 #pragmaMark-dragging the //Mobile View the- (void) Setuppan the {117Uipangesturerecognizer *pan =[[Uipangesturerecognizer alloc] initwithtarget:self action: @selector (pan:)];118 [Self.imageview Addgesturerecognizer:pan];119 } -- (void) Pan: (Uipangesturerecognizer *) Pan121 {122     //gets the movement of the gesture, relative to the original point123Cgpoint TRANSP =[Pan TranslationInView:self.imageView];124Self.imageView.transform =cgaffinetransformtranslate (Self.imageView.transform, transp.x, transp.y); the     //Reset126 [Pan Settranslation:cgpointzero InView:self.imageView];127NSLog (@"%@", Nsstringfromcgpoint (TRANSP)); - }129 @end

Proxy method:

1 allows multiple gestures to be supported at the same time, only one gesture is supported by default, to call this method note setting the proxy2-(BOOL) Gesturerecognizer: (Uigesturerecognizer *) Gesturerecognizer Shouldrecognizesimultaneouslywithgesturerecognizer: (Uigesturerecognizer *) Othergesturerecognizer3 {4     returnYES;5 }6 7 whether to allow triggering gestures to start8-(BOOL) Gesturerecognizershouldbegin: (Uigesturerecognizer *) Gesturerecognizer9 {Ten     returnNO; One } A  - whether to allow the touch of the phone to be received (can control the range of touch) --(BOOL) Gesturerecognizer: (Uigesturerecognizer *) Gesturerecognizer Shouldreceivetouch: (Uitouch *) Touch the { -     //gets the current touch point -Cgpoint CURRENTP =[Touch LocationInView:self.imageView]; - can accept touch in the left half of the picture +     if(Currentp.x < Self.imageView.bounds.size.width *0.5) { -         returnYES; +}Else { A         returnNO; at     } -}

iOS Development small feature eight: simple use of gestures (6 types) and Proxy methods