iOS 15th day (3, event handling, gesture handling)

7> gesture Recognition
Use Uiimageview reason: Before can see the picture, and can listen to click Only UIButton, learned the gesture, our uiimageview can also.
* TAP (Agent: The left can not point, to the right to point)
* Longpress (allowablemovement: Maximum moving range before triggering)
> Default call two times, start once, end once.
* Swipe: (a gesture can only recognize One direction)
Rotation
Based on the last rotation
* Reset: (gesture value is relative to the original position, we should be required relative to the last time, so each call, then reset, each time is zero start rotation angle)
Zoom: RESET
* How can I support both rotation and scaling? By default, multiple fingers are not supported,
Simultaneously: at the same time
The proxy's simultaneously method is invoked when a gesture is used, asking if multiple gestures are supported
* Pan
Get pan Position: Translationinview
Reset: Settranslation:inview: You need to pass a view, because the position of the point is related to the coordinate system, see if he is based on which coordinate system is emptied.

#import "HMViewController.h"@interfaceHmviewcontroller () <UIGestureRecognizerDelegate>@property (Weak, nonatomic) Iboutlet Uiimageview*Imagview;@end@implementationHmviewcontroller- (void) viewdidload{[Super Viewdidload]; //additional setup after loading the view, typically from a nib. //PanUipangesturerecognizer *pan =[[Uipangesturerecognizer alloc] initwithtarget:self action: @selector (pan:)]; [_imagview Addgesturerecognizer:pan];}- (void) Pan: (Uipangesturerecognizer *)pan{//get the position of the finger movementCgpoint trans =[Pan Translationinview:_imagview]; _imagview.transform=cgaffinetransformtranslate (_imagview.transform, trans.x, TRANS.Y); //Reset[Pan Settranslation:cgpointzero Inview:_imagview]; NSLog (@"%@", Nsstringfromcgpoint (trans)); }#warningpinch-(void) addpinch{Uipinchgesturerecognizer*pinch =[[Uipinchgesturerecognizer alloc] initwithtarget:self action: @selector (pinch:)]; //reason for setting up proxy: Want to support multiple gestures simultaneouslyPinch.Delegate=Self ;    [_imagview Addgesturerecognizer:pinch]; }- (void) Pinch: (Uipinchgesturerecognizer *) pinch{_imagview.transform=Cgaffinetransformscale (_imagview.transform, Pinch.scale, Pinch.scale); //ResetPinch.scale =1;}//simultaneous: At the same time//by default, multiple gestures are not supported//when you use a gesture, you call-(BOOL) Gesturerecognizer: (Uigesturerecognizer *) Gesturerecognizer Shouldrecognizesimultaneouslywithgesturerecognizer: (Uigesturerecognizer *) othergesturerecognizer{returnYES;}#warningrotation-(void) addrotation{//RotationUirotationgesturerecognizer *rotation =[[Uirotationgesturerecognizer alloc] initwithtarget:self action: @selector (rotation:)]; Rotation.Delegate=Self ; [_imagview addgesturerecognizer:rotation];}- (void) Rotation: (Uirotationgesturerecognizer *) rotation{NSLog (@"%f", rotation.rotation);//_imagview.transform = cgaffinetransformmakerotation (rotation.rotation);_imagview.transform =cgaffinetransformrotate (_imagview.transform, rotation.rotation); //ResetRotation.rotation =0;}#warningswipe-(void) addswipe{//Swipe//a gesture can only recognize One DirectionUiswipegesturerecognizer *swipe =[[Uiswipegesturerecognizer alloc] initwithtarget:self action: @selector (swipe:)]; Swipe.direction=Uiswipegesturerecognizerdirectionright; [_imagview addgesturerecognizer:swipe];}- (void) Swipe: (Uiswipegesturerecognizer *) swipe{NSLog (@"Swipe");}#warninglongpress-(void) addlongpress{//longpressUilongpressgesturerecognizer *longpress =[[Uilongpressgesturerecognizer alloc] initwithtarget:self action: @selector (longpress:)]; [_imagview addgesturerecognizer:longpress];}- (void) Longpress: (Uilongpressgesturerecognizer *) longpress{//performing events based on status    if(Longpress.state = =Uigesturerecognizerstatebegan) {NSLog (@"longpress"); }}#warningtap-(void) addtap{//TapUITapGestureRecognizer *tap =[[UITapGestureRecognizer alloc] initwithtarget:self action: @selector (tap:)]; //tap how many times to trigger gestures//tap.numberoftapsrequired = 2; //    //    //how many fingers must touch to trigger a gesture//tap.numberoftouchesrequired = 2;tap.Delegate=Self ; [_imagview Addgesturerecognizer:tap];}//can this touch point trigger gestures//-(BOOL) Gesturerecognizer: (Uigesturerecognizer *) Gesturerecognizer Shouldreceivetouch: (Uitouch *) Touch//{//cgpoint currentpoint = [Touch Locationinview:_imagview];//    //if (Currentpoint.x < _imagview.bounds.size.width * 0.5) {//return NO;//}else{//        //return YES;//    }//}- (voidTap: (UITapGestureRecognizer *) tap{NSLog (@"Tap");}- (void) didreceivememorywarning{[Super didreceivememorywarning]; //Dispose of any resources the can be recreated.}@end

iOS 15th day (3, event handling, gesture handling)