详解iOS 实现一对多代理方案
时间：2022-03-25 09:40:17|栏目：iOS代码|点击： 次
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
#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; @end NS_ASSUME_NONNULL_END
.m代理协议分发机制
#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
#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
#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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