I want to draw unicode strings on iphone with CGContextShowText,but it don't support unicode. Is there any way to draw unicode text?

Any suggestions wil be appreciated!

BTW: I also want to use NSString drawAtPoint withFont, But the following code doesn't work!

Code:
NSString *str =  [NSString stringWithFormat:@"%C%C in Unicode", 0x4e2d,0x6587];

[str  drawMarkupAtPoint:CGPointMake(100.0,100.0)];  //it works

struct __GSFont *textFont = GSFontCreateWithName("Helvetica", 2, 20.0f);
[str  drawAtPoint:CGPointMake(200.0,200.0) withFont:textFont ];  //it doesn't work, i can't see this text on iphone
CFRelease(textFont );