objective c - iOS Rotation Gesture after animation -

first question take easy!

creating simple ios app. have view contains rotating dial (a uiimageview) (rotates through rotation gesture) , uibutton when pressed uses uiview animatewithduration move button 1 of 3 locations.

my issue.. rotating dial fine, moving button fine, but.. when move button, rotate dial, location of button "reset" original frame.

how can stop rotation effecting location of button / movement of button.

viewcontroller.h

#import <uikit/uikit.h> #import <avfoundation/avfoundation.h>  @interface viewcontroller : uiviewcontroller <uigesturerecognizerdelegate>{  iboutlet uiimageview *lock; iboutlet uilabel *number; iboutlet uilabel *displaynumber1; iboutlet uilabel *displaynumber2; iboutlet uilabel *displaynumber3;  iboutlet uibutton *slider;  avaudioplayer *theaudio;  }  @property (retain, nonatomic) iboutlet uiimageview *lock; @property (retain, nonatomic) iboutlet uilabel *number; @property (retain, nonatomic) iboutlet uilabel *displaynumber1; @property (retain, nonatomic) iboutlet uilabel *displaynumber2; @property (retain, nonatomic) iboutlet uilabel *displaynumber3;  @property (retain, nonatomic) iboutlet uibutton *slider;  @property (retain, nonatomic) avaudioplayer *theaudio;  -(ibaction)moveslider:(id)sender;  @end 

viewcontroller.m

#import "viewcontroller.h"  @interface viewcontroller ()  @end  @implementation viewcontroller  #define radians_to_degrees(radians) ((radians) * (180.0 / m_pi))  @synthesize lock, number, slider, displaynumber1, displaynumber2, displaynumber3, theaudio;  cgfloat _lastrotation; int lastnumber; nstimer *clicktimer;  int _whichnumberselected;  int _currentdirection; cgfloat _changedirectionmatch;  float no1left = 61; float no2left = 151; float no3left = 238;  nsstring *lasttext1;  cgrect newframeset;  - (bool)prefersstatusbarhidden {     return yes; }    - (void)viewdidload {     [super viewdidload];      lock.userinteractionenabled = yes;       uirotationgesturerecognizer *rotationgesturerecognizer = [[uirotationgesturerecognizer alloc] initwithtarget:self action:@selector(handlerotationwithgesturerecognizer:)];     rotationgesturerecognizer.delegate = self;     [lock addgesturerecognizer:rotationgesturerecognizer];      _lastrotation = 0;      lastnumber = 0;       nsstring *path = [[nsbundle mainbundle] pathforresource:@"click" oftype:@"wav"];     nsurl *fileurl = [[nsurl alloc] initfileurlwithpath: path];     theaudio = [[avaudioplayer alloc] initwithcontentsofurl:fileurl error:null];     theaudio.volume = 1.0;     [theaudio preparetoplay];      _currentdirection = 0;     _changedirectionmatch = 0;     _whichnumberselected = 1;      lasttext1 = ([nsstring stringwithformat:@"0"]);  }    -(ibaction)moveslider:(id)sender {      [uiview animatewithduration:0.5 delay:0 options:uiviewanimationoptioncurveeaseout animations:^{         cgrect newframe = slider.frame;         switch (_whichnumberselected) {             case 1:                 newframe.origin.x= no2left;                 _whichnumberselected = 2;                 break;             case 2:                 newframe.origin.x= no3left;                 _whichnumberselected = 3;                 break;             case 3:                 newframe.origin.x= no2left;                 _whichnumberselected = 4;                 break;             case 4:                 newframe.origin.x= no1left;                 _whichnumberselected = 1;                 break;              default:                 break;         }         slider.frame = newframe;         newframeset = newframe;     } completion:nil]; }     -(void)handlerotationwithgesturerecognizer:(uirotationgesturerecognizer *)rotationgesturerecognizer{        cgfloat newrot = radians_to_degrees(rotationgesturerecognizer.rotation) / 3.6;     lock.transform = cgaffinetransformrotate(lock.transform, rotationgesturerecognizer.rotation);     cgfloat c = _lastrotation - newrot;     _lastrotation = c;      if(c < 0){         c = c + 100;         _lastrotation = c;     }     if(c >= 100){         c = c-100;         _lastrotation = c;     }        if(c >= 99.5){         displaynumber1.text = @"0";     } else {         displaynumber1.text = ([nsstring stringwithformat:@"%.f", c]);     }      if([displaynumber1.text isequaltostring:lasttext1]){     } else {         [theaudio play];     }        lasttext1 = displaynumber1.text;      rotationgesturerecognizer.rotation = 0.0;  }       - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated. }  @end 

welcome stack overflow.

my guess view controller has autolayout active. if that's case, need change animation code animate button manipulating 1 or more constraints on rather changing it's frame.

the problem when change frame directly, @ point triggers re-layout of form, , constraints snap place. if don't explicitly add constraints, system does.

the rotation animation should fine since changing rotation on view's transform, not it's position, , there no constraints i'm aware of rotation.

what animate using constraints attach constraints button in ib, control-drag constraints view controller's header create outlets constraints. (leading , top edge constraints, say.)

then in animation change constant(s) on constraint(s) , call layoutifneeded.

the alternative turn off auto-layout view controller, use old style "struts , springs" layout, , frame animation work always.