NSString与其他类的相互转换

CGAffineTransformFromString

CGPointFromString

CGRectFromString

CGSizeFromString

NSStringFromCGAffineTransform

NSStringFromCGPoint

NSStringFromCGRect

NSStringFromCGSize

NSStringFromUIEdgeInsets

NSStringFromUIOffset

frame.origin.x

frame.origin.y

frame.size.width

frame.size.height

NSString *str = NSStringFromCGRect(myView.frame);

SEL a = NSSelectFromString(@"abc");