iOS Core Animation: CALayer bringSublayerToFront?
            时间:2014-05-08 14:01:24  
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-(void) bringSublayerToFront:(CALayer*)layer
{[layer removeFromSuperlayer];[self insertSublayer:layer atIndex:[self.sublayers count]-1];}-(void) sendSublayerToBack:(CALayer*)layer
{[layer removeFromSuperlayer];[self insertSublayer:layer atIndex:0];}
Note: if you don‘t use ARC, you may wish to 
add [layer retain] at top and [layer 
release] at bottom of both functions to make 
sure layer is not accidentally destructed in a case it 
has retain count = 1.
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