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iOS开发-UIView扩展CGRect

日期：2017-05-30点击：409收藏

关于UIView的位置都会遇到，一般需要改变UIView的位置，需要先获取原有的frame位置，然后在frame上面修改，有的时候如果只是改变了一下垂直方向的位置，宽度和高度的一种，这种写法很麻烦。下面两种写法第二种明显更简单，如果需要实现第二种方法就需要扩展UIView。

     //1 
 CGRect frame=self.testView.frame; 
 frame.size.width=120; 
 self.testView.frame=frame; 
 [self printFrame]; 
 //2 
 self.testView.width=120; 
 [self printFrame]; 
 
  

扩展定义:

     @ interface  UIView (ReSize) 
   
 @property (nonatomic, assign) CGSize size; 
   
 @property (nonatomic,assign)  CGFloat x; 
   
 @property  (nonatomic,assign) CGFloat y; 
   
 @property (nonatomic, assign) CGFloat top; 
   
 @property (nonatomic, assign) CGFloat bottom; 
   
 @property (nonatomic, assign) CGFloat left; 
   
 @property (nonatomic, assign) CGFloat right; 
   
 @property (nonatomic, assign) CGFloat centerX; 
   
 @property (nonatomic, assign) CGFloat centerY; 
   
 @property (nonatomic, assign) CGFloat width; 
   
 @property (nonatomic, assign) CGFloat height; 
   
 @end

扩展实现:

     @implementation UIView (ReSize) 
   
 - (CGSize)size; 
 { 
      return  [self frame].size; 
 } 
   
 - ( void )setSize:(CGSize)size; 
 { 
      CGPoint origin = [self frame].origin; 
      [self setFrame:CGRectMake(origin.x, origin.y, size.width, size.height)]; 
 } 
   
 -(CGFloat)x{ 
      CGRect frame=[self frame]; 
      return  frame.origin.x; 
 } 
   
 -( void )setX:(CGFloat)x{ 
      CGRect frame=[self frame]; 
      frame.origin.x=x; 
      [self setFrame:frame]; 
 } 
   
 -(CGFloat)y{ 
      CGRect frame=[self frame]; 
      return  frame.origin.y; 
 } 
   
 -( void )setY:(CGFloat)y{ 
      CGRect frame=[self frame]; 
      frame.origin.y=y; 
      return  [self setFrame:frame]; 
 } 
   
 - (CGFloat)left; 
 { 
      return  CGRectGetMinX([self frame]); 
 } 
   
 - ( void )setLeft:(CGFloat)x; 
 { 
      CGRect frame = [self frame]; 
      frame.origin.x = x; 
      [self setFrame:frame]; 
 } 
   
 - (CGFloat)top; 
 { 
      return  CGRectGetMinY([self frame]); 
 } 
   
 - ( void )setTop:(CGFloat)y; 
 { 
      CGRect frame = [self frame]; 
      frame.origin.y = y; 
      [self setFrame:frame]; 
 } 
   
 - (CGFloat)right; 
 { 
      return  CGRectGetMaxX([self frame]); 
 } 
   
 - ( void )setRight:(CGFloat)right; 
 { 
      CGRect frame = [self frame]; 
      frame.origin.x = right - frame.size.width; 
       
      [self setFrame:frame]; 
 } 
   
 - (CGFloat)bottom; 
 { 
      return  CGRectGetMaxY([self frame]); 
 } 
   
 - ( void )setBottom:(CGFloat)bottom; 
 { 
      CGRect frame = [self frame]; 
      frame.origin.y = bottom - frame.size.height; 
      [self setFrame:frame]; 
 } 
   
 - (CGFloat)centerX; 
 { 
      return  [self center].x; 
 } 
   
 - ( void )setCenterX:(CGFloat)centerX; 
 { 
      [self setCenter:CGPointMake(centerX, self.center.y)]; 
 } 
   
 - (CGFloat)centerY; 
 { 
      return  [self center].y; 
 } 
   
 - ( void )setCenterY:(CGFloat)centerY; 
 { 
      [self setCenter:CGPointMake(self.center.x, centerY)]; 
 } 
   
 - (CGFloat)width; 
 { 
      return  CGRectGetWidth([self frame]); 
 } 
   
 - ( void )setWidth:(CGFloat)width; 
 { 
      CGRect frame = [self frame]; 
      frame.size.width = width; 
      [self setFrame:CGRectStandardize(frame)]; 
 } 
   
 - (CGFloat)height; 
 { 
      return  CGRectGetHeight([self frame]); 
 } 
   
 - ( void )setHeight:(CGFloat)height; 
 { 
      CGRect frame=[self frame]; 
      frame.size.height = height; 
      [self setFrame:CGRectStandardize(frame)]; 
 } 
   
 @end 
 
  