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Rotate a NSString to 90°

To rotate the string 90 degrees:

[stringname setTransform:CGAffineTransformMakeRotation(M_PI / 2)];

1	[stringname setTransform:CGAffineTransformMakeRotation(M_PI / 2)];

In math.h library M_PI is:

#define M_PI   3.14159265358979323846264338327950288

1	#define M_PI 3.14159265358979323846264338327950288