UIKIT_EXTERN NSString *NSStringFromCGPoint(CGPoint point);

UIKIT_EXTERN NSString *NSStringFromCGVector(CGVector vector);

UIKIT_EXTERN NSString *NSStringFromCGSize(CGSize size);

UIKIT_EXTERN NSString *NSStringFromCGRect(CGRect rect);

UIKIT_EXTERN NSString *NSStringFromCGAffineTransform(CGAffineTransform transform);

UIKIT_EXTERN NSString *NSStringFromUIEdgeInsets(UIEdgeInsets insets);

UIKIT_EXTERN NSString *NSStringFromUIOffset(UIOffset offset);

UIKIT_EXTERN CGPoint CGPointFromString(NSString *string);

UIKIT_EXTERN CGVector CGVectorFromString(NSString *string);

UIKIT_EXTERN CGSize CGSizeFromString(NSString *string);

UIKIT_EXTERN CGRect CGRectFromString(NSString *string);

UIKIT_EXTERN CGAffineTransform CGAffineTransformFromString(NSString *string);

UIKIT_EXTERN UIEdgeInsets UIEdgeInsetsFromString(NSString *string);

UIKIT_EXTERN UIOffset UIOffsetFromString(NSString *string);

NSString *NSStringFromCGPoint(CGPoint point);

NSString *NSStringFromCGVector(CGVector vector);

NSString *NSStringFromCGSize(CGSize size);

NSString *NSStringFromCGRect(CGRect rect);

NSString *NSStringFromCGAffineTransform(CGAffineTransform transform);

NSString *NSStringFromUIEdgeInsets(UIEdgeInsets insets);

NSString *NSStringFromUIOffset(UIOffset offset); 

CGPoint CGPointFromString(NSString *string);

CGVector CGVectorFromString(NSString *string);

CGSize CGSizeFromString(NSString *string);

CGRect CGRectFromString(NSString *string);   //我们在监听高度变化时需要用这个 ,获取键盘的frame 值,就是从一个 string类型中取出 CGRect!

CGAffineTransform CGAffineTransformFromString(NSString *string);

UIEdgeInsets UIEdgeInsetsFromString(NSString *string);//距离边界的距离,上左下右的顺序!

UIOffset UIOffsetFromString(NSString *string);