常用框架-UIViewExt

.H文件

#import <UIKit/UIKit.h>



 



CGPoint CGRectGetCenter(CGRect rect);



CGRect  CGRectMoveToCenter(CGRect rect, CGPoint center);



 



@interface UIView (ViewFrameGeometry)



@property CGPoint origin;



@property CGSize size;



 



@property (readonly) CGPoint bottomLeft;



@property (readonly) CGPoint bottomRight;



@property (readonly) CGPoint topRight;



 



@property CGFloat height;



@property CGFloat width;



 



@property CGFloat top;



@property CGFloat left;



 



@property CGFloat bottom;



@property CGFloat right;



 



- (void) moveBy: (CGPoint) delta;



- (void) scaleBy: (CGFloat) scaleFactor;



- (void) fitInSize: (CGSize) aSize;



@end

 

 

.m文件

/*



 Erica Sadun, http://ericasadun.com



 iPhone Developer's Cookbook, 3.0 Edition



 BSD License, Use at your own risk



 */



 



#import "UIViewExt.h"



 



CGPoint CGRectGetCenter(CGRect rect)



{



    CGPoint pt;



    pt.x = CGRectGetMidX(rect);



    pt.y = CGRectGetMidY(rect);



    return pt;



}



 



CGRect CGRectMoveToCenter(CGRect rect, CGPoint center)



{



    CGRect newrect = CGRectZero;



    newrect.origin.x = center.x-CGRectGetMidX(rect);



    newrect.origin.y = center.y-CGRectGetMidY(rect);



    newrect.size = rect.size;



    return newrect;



}



 



@implementation UIView (ViewGeometry)



 



// Retrieve and set the origin



- (CGPoint) origin



{



return self.frame.origin;



}



 



- (void) setOrigin: (CGPoint) aPoint



{



CGRect newframe = self.frame;



newframe.origin = aPoint;



self.frame = newframe;



}



 



 



// Retrieve and set the size



- (CGSize) size



{



return self.frame.size;



}



 



- (void) setSize: (CGSize) aSize



{



CGRect newframe = self.frame;



newframe.size = aSize;



self.frame = newframe;



}



 



// Query other frame locations



- (CGPoint) bottomRight



{



CGFloat x = self.frame.origin.x + self.frame.size.width;



CGFloat y = self.frame.origin.y + self.frame.size.height;



return CGPointMake(x, y);



}



 



- (CGPoint) bottomLeft



{



CGFloat x = self.frame.origin.x;



CGFloat y = self.frame.origin.y + self.frame.size.height;



return CGPointMake(x, y);



}



 



- (CGPoint) topRight



{



CGFloat x = self.frame.origin.x + self.frame.size.width;



CGFloat y = self.frame.origin.y;



return CGPointMake(x, y);



}



 



 



// Retrieve and set height, width, top, bottom, left, right



- (CGFloat) height



{



return self.frame.size.height;



}



 



- (void) setHeight: (CGFloat) newheight



{



CGRect newframe = self.frame;



newframe.size.height = newheight;



self.frame = newframe;



}



 



- (CGFloat) width



{



return self.frame.size.width;



}



 



- (void) setWidth: (CGFloat) newwidth



{



CGRect newframe = self.frame;



newframe.size.width = newwidth;



self.frame = newframe;



}



 



- (CGFloat) top



{



return self.frame.origin.y;



}



 



- (void) setTop: (CGFloat) newtop



{



CGRect newframe = self.frame;



newframe.origin.y = newtop;



self.frame = newframe;



}



 



- (CGFloat) left



{



return self.frame.origin.x;



}



 



- (void) setLeft: (CGFloat) newleft



{



CGRect newframe = self.frame;



newframe.origin.x = newleft;



self.frame = newframe;



}



 



- (CGFloat) bottom



{



return self.frame.origin.y + self.frame.size.height;



}



 



- (void) setBottom: (CGFloat) newbottom



{



CGRect newframe = self.frame;



newframe.origin.y = newbottom - self.frame.size.height;



self.frame = newframe;



}



 



- (CGFloat) right



{



return self.frame.origin.x + self.frame.size.width;



}



 



- (void) setRight: (CGFloat) newright



{



CGFloat delta = newright - (self.frame.origin.x + self.frame.size.width);



CGRect newframe = self.frame;



newframe.origin.x += delta ;



self.frame = newframe;



}



 



// Move via offset



- (void) moveBy: (CGPoint) delta



{



CGPoint newcenter = self.center;



newcenter.x += delta.x;



newcenter.y += delta.y;



self.center = newcenter;



}



 



// Scaling



- (void) scaleBy: (CGFloat) scaleFactor



{



CGRect newframe = self.frame;



newframe.size.width *= scaleFactor;



newframe.size.height *= scaleFactor;



self.frame = newframe;



}



 



// Ensure that both dimensions fit within the given size by scaling down



- (void) fitInSize: (CGSize) aSize



{



CGFloat scale;



CGRect newframe = self.frame;



 



if (newframe.size.height && (newframe.size.height > aSize.height))



{



scale = aSize.height / newframe.size.height;



newframe.size.width *= scale;



newframe.size.height *= scale;



}



 



if (newframe.size.width && (newframe.size.width >= aSize.width))



{



scale = aSize.width / newframe.size.width;



newframe.size.width *= scale;



newframe.size.height *= scale;



}



 



self.frame = newframe;



}



@end