Uigesture Basic gestures

Here are the zoom gestures and pinch gestures:

Directly on the code:

1 #import "ViewController.h"2 3 @interfaceViewcontroller () <UIGestureRecognizerDelegate>4 5 @end6 7 @implementationViewcontroller8 9- (void) Viewdidload {Ten [Super Viewdidload]; One     //additional setup after loading the view, typically from a nib. A      -     //If you need to rotate and scale simultaneously we also need to implement a protocol uigesturerecognizerdelegate -      the      -UIImage *image = [UIImage imagenamed:@"2.jpg"]; -      -Uiimageview *imageview =[[Uiimageview alloc]init]; +Imageview.frame = CGRectMake ( -, $, -, -); -imageview.userinteractionenabled =YES; +Imageview.image =image; A [Self.view Addsubview:imageview]; at      -     //Add a zoom gesture (pinch gesture) -_pinges =[[Uipinchgesturerecognizer alloc]initwithtarget:self Action: @selector (pinchact:)]; -      - [ImageView addgesturerecognizer:_pinges]; -      in     //Create a rotation gesture -_rotges =[[Uirotationgesturerecognizer alloc]initwithtarget:self Action: @selector (rotges:)]; to      + [ImageView addgesturerecognizer:_rotges]; -      the     //set up the protocol agent *_pinges.Delegate=Self ; $_rotges.Delegate=Self ;Panax Notoginseng      - } the  +- (void) Pinchact: (Uipinchgesturerecognizer *) pin{ A     //get the monitor image view (i.e. the ImageView object above) theUiimageview *iview = (Uiimageview *) Pin.view; +     //matrix transformation Calculation and assignment of Image view Objects -     //transform represents the transformation of a graphic $     //Cgaffinetransformscale produces a new matrix by zooming in $     //P1 the original matrix -     //P2 Scale in X-direction -     //p3 scale in y direction theIview.transform =Cgaffinetransformscale (Iview.transform, Pin.scale, Pin.scale); -     Wuyi      the     //To return a scale value to a unit value -Pin.scale =1; Wu      - } About  $- (void) Rotges: (Uirotationgesturerecognizer *) rotges{ -      -     //Get rotated Objects -Uiimageview *iview = (Uiimageview *) Rotges.view; A     //Calculate rotation changes and assign values +Iview.transform =cgaffinetransformrotate (Iview.transform, rotges.rotation); the      -     //Select angle Clear 0; $Rotges.rotation =0; the      the      the } the //Implementing protocol Methods - //can I respond to two gestures at the same time in //if the return value is yes you can respond at the same time; the-(BOOL) Gesturerecognizer: (Uigesturerecognizer *) Gesturerecognizer Shouldrecognizesimultaneouslywithgesturerecognizer: (Uigesturerecognizer *) othergesturerecognizer{ the      About     returnYES; the}

This makes it easy to zoom (pinch) and rotate the view.

Uigesture Basic gestures