我不确定这个函数做什么或应该做什么。voidCGContextSetTextMatrix(CGContextRefc,CGAffineTransformt);Thereference不是那么有帮助。:(Setsthecurrenttextmatrix.Thetextmatrixspecifiesthetransformfromtextspacetouserspace.Toproducethefinaltextrenderingmatrixthatisusedtoactuallydrawthetextonthepage,Quartzconcatenatesthetextmatrixwit