让Button旋转:

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 //M_PI == 3.14 == 180
 [btn8
setTransform:CGAffineTransformMakeRotation(M_PI/7.2)];//25

[btn8 setTransform:CGAffineTranformMakeRotation(M_PI/7.2)];
[btn8 setTransform:CGAffineTranformMakeRotation(M_PI/7.2)];
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