"Go" uses gestures to scale, rotate, and move Uiimageview

Original Address http://blog.csdn.net/crazy_frog/article/details/8664108/

//Add all the gestures- (void) Addgesturerecognizertoview: (UIView *) view{//Rotate gesturesUirotationgesturerecognizer *rotationgesturerecognizer =[[Uirotationgesturerecognizer alloc] initwithtarget:self action: @selector (Rotateview:)];        [View Addgesturerecognizer:rotationgesturerecognizer]; //Zoom gestureUipinchgesturerecognizer *pinchgesturerecognizer =[[Uipinchgesturerecognizer alloc] initwithtarget:self action: @selector (Pinchview:)];        [View Addgesturerecognizer:pinchgesturerecognizer]; //Move gesturesUipangesturerecognizer *pangesturerecognizer =[[Uipangesturerecognizer alloc] initwithtarget:self action: @selector (Panview:)]; [View Addgesturerecognizer:pangesturerecognizer];}//Handling Rotation gestures- (void) Rotateview: (Uirotationgesturerecognizer *) rotationgesturerecognizer{UIView*view =Rotationgesturerecognizer.view; if(rotationgesturerecognizer.state = = Uigesturerecognizerstatebegan | | rotationgesturerecognizer.state = =uigesturerecognizerstatechanged) {View.transform=cgaffinetransformrotate (View.transform, rotationgesturerecognizer.rotation); [Rotationgesturerecognizer setrotation:0]; }}//Handling Zoom gestures- (void) Pinchview: (Uipinchgesturerecognizer *) pinchgesturerecognizer{UIView*view =Pinchgesturerecognizer.view; if(pinchgesturerecognizer.state = = Uigesturerecognizerstatebegan | | pinchgesturerecognizer.state = =uigesturerecognizerstatechanged) {View.transform=Cgaffinetransformscale (View.transform, Pinchgesturerecognizer.scale, Pinchgesturerecognizer.scale); Pinchgesturerecognizer.scale=1; }}//Handling Drag gestures- (void) Panview: (Uipangesturerecognizer *) pangesturerecognizer{UIView*view =Pangesturerecognizer.view; if(pangesturerecognizer.state = = Uigesturerecognizerstatebegan | | pangesturerecognizer.state = =uigesturerecognizerstatechanged) {Cgpoint translation=[Pangesturerecognizer TranslationInView:view.superview]; [View SetCenter: (Cgpoint) {view.center.x+ translation.x, View.center.y +TRANSLATION.Y}];    [Pangesturerecognizer Settranslation:cgpointzero InView:view.superview]; }}

[Self addgesturerecognizertoview:view];

If you're dealing with a picture, don't forget.
[ImageView Setuserinteractionenabled:yes];
[ImageView Setmultipletouchenabled:yes];

Define variables inside the. h file

@interface Yourviewcontroller:uiviewcontroller<uigesturerecognizerdelegate>  {      cgfloat lastScale;      CGRect oldframe;     // Save the original size      of the picture CGRect Largeframe;  // determine the maximum magnification of the  picture }  

Viewdidload inside Plus

- (void) viewdidload{[Super Viewdidload]; Showimgview= [[Uiimageview alloc] Initwithframe:<spanclass="S1">CGRectMake</span> (<spanclass="S2">0</span>, <spanclass="S2">0</span>, the,480)];    [Showimgview Setmultipletouchenabled:yes];    [Showimgview Setuserinteractionenabled:yes]; [Showimgview setimage:[uiimage imagenamed:@"1.jpg"]]; Oldframe=Showimgview.frame; Largeframe= CGRectMake (0-Screensize.width,0-Screensize.height,3* OldFrame.size.width,3*oldFrame.size.height);    [Self addgesturerecognizertoview:showimgview]; [Self.view Addsubview:showimgview];

I have modified the scaling code, added the restrictions, and other similar

//Handling Zoom gestures- (void) Pinchview: (Uipinchgesturerecognizer *) Pinchgesturerecognizer {UIView*view =Pinchgesturerecognizer.view; if(pinchgesturerecognizer.state = = Uigesturerecognizerstatebegan | | pinchgesturerecognizer.state = =uigesturerecognizerstatechanged) {View.transform=Cgaffinetransformscale (View.transform, Pinchgesturerecognizer.scale, Pinchgesturerecognizer.scale); if(ShowImgView.frame.size.width <oldFrame.size.width) {showimgview.frame=Oldframe; //make the picture smaller than the original        }          if(ShowImgView.frame.size.width >3*oldFrame.size.width) {showimgview.frame=Largeframe; } Pinchgesturerecognizer.scale=1; }  }  

"Go" uses gestures to scale, rotate, and move Uiimageview