iphone - Logic of using UISlider Xcode -


i'm stuck @ moment controlling uislider in xcode. i've made horizontal slider in interface builder , manage code controls in xcode. right i'm not sure how code logic. if user slides nib left, i'd rotate image counter-clockwise , if user slides right, rotate image clockwise.

minimum value of slider i've set 0 , max 100. initial value 50.

for transformation i'm using cgaffinetransformmakerotation(myangle). i've set myangle float. condition, here's snippet of code:

myslider.value = myangle; // cgaffine  if(myangle < 50) {    myangle -= 0.1; }  if(myangle > 50) {    myangle += 0.1; }

when slide nib, rotates anti-clockwise. what's best logic can use? hope can help. thanks.

-hakimo

note doc says angle as,

the angle, in radians, matrix rotates coordinate system axes. in ios, positive value specifies counterclockwise rotation , negative value specifies clockwise rotation. in mac os x, positive value specifies clockwise rotation , negative value specifies counterclockwise rotation.

i think following should work. not sure though. (considering minimumvalue 0).

float middlevalue = slider.maximumvalue / 2; float value = middlevalue - slider.value; float degrees = (middlevalue / 180) * value; float radians = degrees * (3.14/180);

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