ios4 - XCode rotate uibutton clockwise -


i want rotate uibutton @ 180 degrees clockwise. rotate counterclockwise.

this how tried:

cgcontextref context = uigraphicsgetcurrentcontext(); [uiview beginanimations:nil context:context]; [uiview setanimationcurve:uiviewanimationcurveeaseinout]; [uiview setanimationduration:0.3];  mybutton.transform = cgaffinetransformrotate( mybutton.transform, m_pi);  [uiview commitanimations];

also this:

mybutton.transform = cgaffinetransformrotate( mybutton.transform, - m_pi);

what doing wrong?

i've had similar experience, , best guess following:

the rotation transform translates net result, meaning absolute rotation. since rotating -pi , +pi results in same net effect (both 180 degrees), animation ends choosing default direction; seems counterclockwise on ios.

by setting value more negative -m_pi, @kishorebjv mentioned, shortest rotation path through positive direction (switching animation clockwise). can see effect using m_pi+0.01 or m_pi-0.01. both positive numbers, result in different directions.

more verbose explanation: value: m_pi+0.01 direction: counterclockwise reasoning: this translates rotation of ~180.6, shortest rotation negative 179.4 degrees.

value: m_pi-0.01 direction: clockwise reasoning: this translates rotation of ~179.4,  shortest rotation positive 179.4 degrees.  , going value given kishorebjv value: -3.141593 direction: clockwise reasoning: value past -180 degrees, recalling pi 3.1415926 ....so shortest rotation positive 179 degrees

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