The property delegate of CALayer cause Crash.

在非arc與arc的環境中使用時，導致程式crash.

 

 1 //當前類使用－fno-objc 編譯 2  3     needle_ = [[MyView alloc] init]; 4  5     needleLayer = [CALayer layer];     6     needleLayer.delegate = self.needle; 7  8  9 - (void)dealloc10 {    11     [needle_ release];12     [needleLayer release];13     [super dealloc];   //crash14 }15     

 

 

1 -(void) drawLayer: (CALayer*) layer inContext: (CGContextRef) context  

 

he lightest-wight solution would be to create a small helper class in the the file as the UIView that's using the CALayer:

In MyView.h

@interfaceMyLayerDelegate:NSObject...@end

In MyView.m

@implementationMyLayerDelegate-(void)drawLayer:(CALayer*)layer inContext:(CGContextRef)ctx{...}@end

Just place those at the top of your file, immediately below the #import directives. That way it feels more like using a "private class" to handle the drawing (although it isn't -- the delegate class can be instantiated by any code that imports the header).