iphone - how To detect that cgaffinetransformrotate method is rotating the clockwise or anticlockwise? -

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i need figure out thorough cgaffinetransformrrotate rotating view towards clockwise or anticlockwise.

how possible? 

yourview.transform = cgaffinetransformmakerotation( positive value );
rotate view clockwise, , 
yourview.transform = cgaffinetransformmakerotation( negative value );
rotate view anti clockwise,


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