One Quickie

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Push/pop CGContext state (Graphics->General)

CGContextRef context = ...;
...
CGContextSaveGState (context); {
    [drawable drawWithContext: context
              inRect: bounds
              withMetrics: self.metrics]; // or whatever drawing you're doing
} CGContextRestoreGState (context);

Edit: Gus Meuller of Flying Meat fame has a block-based utility that does this:

void FMCGContextHoldGState (CGContextRef context, void (^block)()) {
    CGContextSaveGState(context); {
        block ();
    } CGContextRestoreGState(context);
}

and if you're wanting to do something similar with NSGraphicsContexts:

void FMNSContextHoldGState (void (^block)()) {
    [NSGraphicsContext saveGraphicsState]; {
        block ();
    } [NSGraphicsContext restoreGraphicsState];
}