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);