iOS之Category关联属性
2024-08-31 17:42:03
Objective-C
/** 原文件 */
// Person.h
#import <Foundation/Foundation.h>
@interface Person : NSObject
@property (nonatomic, copy) NSString *name;
@end
// Person.m
#import "Person.h"
@implementation Person
- (instancetype)init {
if (self = [super init]) {
_name = @"";
NSLog(@"%@", [self class]); // Person
NSLog(@"%@", [super class]); // Person
}
return self;
}
- (void)dealloc {
NSLog(@"Call dealloc in Person.m");
}
@end
/** Category文件*/
// Person+Category.h
#import "Person.h"
@interface Person (Category)
// 添加属性address
@property (nonatomic, copy) NSString *address;
@end
// Person+Category.m
#import "Person+Category.h"
#import <objc/runtime.h>
@implementation Person (Category)
static void *addressKey = &addressKey;
#pragma mark - OC 在Category关联属性
- (void)setAddress:(NSString *)address {
objc_setAssociatedObject(self, &addressKey, address, OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (NSString *)address {
return objc_getAssociatedObject(self, &addressKey);
}
/** 在category里面执行dealloc方法后，Person类文件里的dealloc会不执行 */
- (void)dealloc {
objc_removeAssociatedObjects(self);
NSLog(@"remove associated");
}
@end
// test
#import "Person+Category.h"
Person *p = [Person new];
p.name = @"xiaoMing";
p.address = @"gz";
NSLog(@"name is: %@, address is: %@", p.name, p.address);
Swift
// .swift文件
import Cocoa
class Car {
var name = ""
}
private var priceKey: Void?
extension Car {
/// car's price
var price: Double? {
get {
return objc_getAssociatedObject(self, &priceKey) as? Double
}
set {
objc_setAssociatedObject(self, &priceKey, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
let c1 = Car()
c1.name = "su"
c1.price = 110000.1
print("c1's name is: \(c1.name) and price is: \(c1.price!)")
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