IOS添加分类

今天突然有人问我，怎么给UIView添加分类，使得在外面调用点语法获得结构体的值更为简单快捷。
这个问题对于知道的人来说是个再简单不过的问题了，但是对于不知道的人来说确实如同蜀道一样，有这个
疑问的朋友注意了，是时候该看看基础知识@property.
我在此附上源代码，会的朋友当成是温习，不会的朋友可以借鉴一下。

#import <UIKit/UIKit.h>
@interface UIView (ZQ_ViewFrame)
@property CGFloat width;
@property CGFloat height;
@property CGFloat x;
@property CGFloat y;
@property CGFloat centerX;
@property CGFloat centerY;
@end

#import "UIView+ZQ_ViewFrame.h"
@implementation UIView (ZQ_ViewFrame)

-(CGFloat)width{

    return self.frame.size.width;
}

-(void)setWidth:(CGFloat)width{

    CGRect frame = self.frame;
    frame.size.width = width;
    self.frame = frame;
}

-(CGFloat)height{

    return self.frame.size.height;
}

-(void)setHeight:(CGFloat)height{

    CGRect frame = self.frame;
    frame.size.height = height;
    self.frame = frame;
}

-(CGFloat)x{

    return self.frame.origin.x;
}

-(void)setX:(CGFloat)x{

    CGRect frame = self.frame;
    frame.origin.x = x;
    self.frame = frame;
}

-(CGFloat)y{

    return self.frame.origin.y;
}

-(void)setY:(CGFloat)y{

    CGRect frame = self.frame;
    frame.origin.y = y;
    self.frame = frame;
}

- (void)setCenterX:(CGFloat)centerX
{
    CGPoint center = self.center;
    center.x = centerX;
    self.center = center;
}
- (CGFloat)centerX
{
    return self.center.x;
}
- (void)setCenterY:(CGFloat)centerY
{
    CGPoint center = self.center;
    center.y = centerY;
    self.center = center;
}

- (CGFloat)centerY
{
    return self.center.y;
}

@end