OSX中转旋图片代码，

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以下是OSX中转旋图片代码，注意要将要旋转的图层勾选上：

spinButton.hidden =NO;

[CATransaction begin];

[CATransactionsetValue:(id)kCFBooleanTrueforKey:kCATransactionDisableActions];

CGRect frame = [spinButtonframe];

spinButton.layer.anchorPoint = CGPointMake(0.5,0.5);

spinButton.layer.position =CGPointMake(frame.origin.x +0.5 * frame.size.width, frame.origin.y +0.5 * frame.size.height);

[CATransactioncommit];

[CATransactionbegin];

[CATransactionsetValue:(id)kCFBooleanFalseforKey:kCATransactionDisableActions];

[CATransactionsetValue:[NSNumbernumberWithFloat:1.5]forKey:kCATransactionAnimationDuration];

CABasicAnimation *animation;

animation = [CABasicAnimationanimationWithKeyPath:@"transform.rotation.z"];

animation.fromValue = [NSNumbernumberWithFloat:0.0];

animation.toValue = [NSNumbernumberWithFloat:2 *M_PI];

animation.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionLinear];

animation.delegate =self;

[spinButton.layeraddAnimation:animation forKey:@"rotationAnimation"];

[CATransactioncommit];

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