objective c - Image translation in ios -

objective c - Image translation in ios -

i not programmer if stupid question forgive me ! learning image transformation in ios want translate image 1 position on button click event here code...

- (ibaction)showinfobybutton:(id)sender { cgfloat v1 = imageview.center.x; cgfloat v2 = imageview.center.y; cgaffinetransform trans = cgaffinetransformtranslate(imageview.transform, v1, v2); imageview.transform = trans; }

what's wrong code. translate in y direction not in x. no matter how much set value v1 function don't care. thought what's going on ..... totally stucked give thanks help

in terms of question cgaffinetransform, couple of thoughts:

are doing in init method or viewdidload? if so, may in view creation process many of uiview related properties of imageview (such center) not reliable @ point. take , create sure you're getting non-zero values v1 , v2. if want @ frame coordinates or like, might want defer until viewdidappear or later.

are using autolayout? open storyboard or nib , @ document properties (below). if you're moving things around on screen, might want turn off.

as aside, setting v1 , v2 based upon center of imageview curious. you're moving center amount of center. you'd see following:

cgfloat dx = 100.0; cgfloat dy = 200.0; [uiview animatewithduration:1.0 animations:^{ cgaffinetransform trans = cgaffinetransformtranslate(self.someview.transform, dx, dy); imageview.transform = trans; }];

by way, animate (a) because that's improve user experience; , (b) when doing diagnostics this, makes easier me see it's changing , it's changing to. if don't want animation, don't utilize animatewithduration code.

by way, if want move uiview control, if you're not using autolayout, mutual way utilize animationwithduration alter either center or frame, e.g.:

[uiview animatewithduration:1.0 animations:^{ imageview.center = cgpointmake(newx, newy); // set newx , newy whatever want }];

if you're using autolayout, process little more complicated. 1 technique in autolayout programmatically alter constraints, that's beyond scope of question.

ios objective-c