给category添加基本数据类型属性
说明
通常，我们添加属性都是通过对象扩展来实现的，其实，我们也可以用runtime来添加基本数据类型的属性
源码
//
// UIView+AnimationProperty.h
// RuntimeCategory
//
// Created by YouXianMing on 15/7/8.
// Copyright (c) 2015年 YouXianMing. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface UIView (AnimationProperty)
@property (nonatomic) CGFloat scale;
@end//
// UIView+AnimationProperty.m
// RuntimeCategory
//
// Created by YouXianMing on 15/7/8.
// Copyright (c) 2015年 YouXianMing. All rights reserved.
//
#import "UIView+AnimationProperty.h"
#import <objc/runtime.h>
@implementation UIView (AnimationProperty)
NSString * const _recognizerScale = @"_recognizerScale";
- (void)setScale:(CGFloat)scale {
objc_setAssociatedObject(self, (__bridge const void *)(_recognizerScale), @(scale), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
self.transform = CGAffineTransformMakeScale(scale, scale);
}
- (CGFloat)scale {
NSNumber *scaleValue = objc_getAssociatedObject(self, (__bridge const void *)(_recognizerScale));
return scaleValue.floatValue;
}
@end//
// ViewController.m
// RuntimeCategory
//
// Created by YouXianMing on 15/7/8.
// Copyright (c) 2015年 YouXianMing. All rights reserved.
//
#import "ViewController.h"
#import "UIView+AnimationProperty.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIView *redView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
redView.backgroundColor = [UIColor redColor];
[self.view addSubview:redView];
UIView *greenView = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
greenView.backgroundColor = [UIColor greenColor];
greenView.scale = 0.5f;
[self.view addSubview:greenView];
}
@end分析
