实现方案一
利用可变数组。 签协议方需要add到代理的数组中， 然后协议遍历数组中的对象，进行分发。
缺点是需要数组对其内部元素是强引用， 需要在合适的地方对其进行释放，否则会有内存泄漏
代理协议的对象.h写法
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#import <UIKit/UIKit.h>NS_ASSUME_NONNULL_BEGIN@protocol TestSubViewDelegate <NSObject>- (void)testSendSomeMessageToOther:(NSString *)somethings;- (void)testSendSome:(NSString *)somethings;@end@interface TestSubView : UIView//@property (nonatomic, weak)id <TestSubViewDelegate>delegate;@property (nonatomic, strong)NSMutableArray <id<TestSubViewDelegate>>* __nullable delegates;- (void)addDelegate:(id<TestSubViewDelegate>)delegate;// 需要在合适的地方销毁对象。- (void)destory;@endNS_ASSUME_NONNULL_END |
.m代理协议分发机制
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#import "TestSubView.h"@interface TestSubView ()@end@implementation TestSubView- (instancetype)init { if (self = [super init]) { self.delegates = [NSMutableArray array]; // 测试，执行 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [self test1DelegateAction]; }); dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [self test2DelegateAction]; }); } return self;}// 测试代理方法分发1- (void)test1DelegateAction { [self.delegates enumerateObjectsUsingBlock:^(id<TestSubViewDelegate> _Nonnull delegate, NSUInteger idx, BOOL * _Nonnull stop) { if ([delegate respondsToSelector:@selector(testSendSomeMessageToOther:)]) { [delegate testSendSomeMessageToOther:@"传递的Some"]; } }];}// 测试代理分发2- (void)test2DelegateAction { [self.delegates enumerateObjectsUsingBlock:^(id<TestSubViewDelegate> _Nonnull delegate, NSUInteger idx, BOOL * _Nonnull stop) { if ([delegate respondsToSelector:@selector(testSendSome:)]) { [delegate testSendSome:@"传递的Some2-"]; } }];}- (void)destory { [self.delegates removeAllObjects]; self.delegates = nil;}- (void)addDelegate:(id<TestSubViewDelegate>)delegate { [self.delegates addObject:delegate];} |
签订代理方1
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#import "View1Controller.h"#import "TestSubView.h"@interface View1Controller ()<TestSubViewDelegate>@end@implementation View1Controller- (void)viewDidLoad { [super viewDidLoad]; TestSubView *ts = [TestSubView new]; [ts addDelegate:self]; [self.view addSubview:ts];}#pragma mark - TestSubViewDelegate- (void)testSendSomeMessageToOther:(NSString *)somethings { NSLog(@"%@", somethings);}- (void)testSendSome:(NSString *)somethings { NSLog(@"%@", somethings);} @end |
签订方2
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#import "ViewController.h"#import "View1Controller.h"#import "TestSubView.h"@interface ViewController ()<TestSubViewDelegate>@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; TestSubView *ts = [TestSubView new]; [ts addDelegate:self]; [self.view addSubview:ts];}- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { View1Controller *vc = [View1Controller new]; [self presentViewController:vc animated:YES completion:nil];}#pragma mark - TestSubViewDelegate- (void)testSendSomeMessageToOther:(NSString *)somethings { NSLog(@"%@", somethings);}@end |
实现方案二
采用NSPointerArray去声明delegates的数组，这样就可以不用操心管理内存泄漏的问题， 因为NSPointerArray里面的元素都是weak化的。 会随着当前对象释放而释放掉。
还有一些NSHashTable NSMapTable 等等， 实现方式大同小异。
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原文链接：https://juejin.cn/post/7044812578735783944
