iOS开发-UIView扩展CGRect

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:

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@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