1. 创建分类

  1.1 创建 View 分类

    1) View 分类头文件，UIView+Category.h

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface UIView (Category)
@property (nonatomic, assign) CGFloat x;
@property (nonatomic, assign) CGFloat y;
@property (nonatomic, assign) CGFloat width;
@property (nonatomic, assign) CGFloat height;
@property (nonatomic, assign) CGFloat centerX;
@property (nonatomic, assign) CGFloat centerY;
@property (nonatomic, assign) CGSize size;
@property (nonatomic, assign) CGPoint origin;
@end

NS_ASSUME_NONNULL_END

    2) 实现头文件，UIView+Category.m

#import "UIView+Category.h"

@implementation UIView (Category)

- (void)setX:(CGFloat)x
{
    CGRect frame = self.frame;
    frame.origin.x = x;
    self.frame = frame;
}

- (void)setY:(CGFloat)y
{
    CGRect frame =