IOS touch tracking code -

i'm making app iphone in xcode, , requires box follow finger on x axis. couldn't find solution online this, , coding knowledge isn't great.

i've been trying use touchesbegan , touchesmoved.

could please write me code please?

first need uigesturerecognizerdelegate on viewcontroller.h file:

@interface viewcontroller : uiviewcontroller <uigesturerecognizerdelegate>  @end 

then declare uiimageview on viewcontroller.m, so, bool track if touch event occurring inside uiimageview:

@interface viewcontroller () {     uiimageview *ballimage;     bool touchstarted; } 

then initialize uiimageview on viewdidload:

- (void)viewdidload {     [super viewdidload];     uiimage *image = [uiimage imagenamed:@"ball.png"];     ballimage =  [[uiimageview alloc]initwithimage:image];     [ballimage setframe:cgrectmake(self.view.center.x, self.view.center.y, ballimage.frame.size.width, ballimage.frame.size.height)];     [self.view addsubview:ballimage]; } 

after can start doing modifications what's best using these methods:

-(void)touchesbegan:(nsset *)touches withevent:(uievent *)event {     uitouch *touch = [touches anyobject];     cgpoint touch_point = [touch locationinview:ballimage];      if ([ballimage pointinside:touch_point withevent:event])     {         touchstarted = yes;      } else {          touchstarted = no;     } }  -(void)touchesmoved:(nsset *)touches withevent:(uievent *)event {     if ([touches count]==1 && touchstarted) {         uitouch *touch = [touches anyobject];         cgpoint p0 = [touch previouslocationinview:ballimage];         cgpoint p1 = [touch locationinview:ballimage];         cgpoint center = ballimage.center;         center.x += p1.x - p0.x;         // if need move on x axis         // comment following line:         center.y += p1.y - p0.y;          ballimage.center = center;         nslog(@"moving uiimageview...");     }  }