开源IM在iOS开发中的消息转发功能有哪些？
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handler;
@end
@implementation MessageManager
- (void)sendMessage:(NSString *)message {
if (self.handler) {
[self.handler handleMessage:message];
}
}
@end
@interface MessageHandler : NSObject
- (void)handleMessage:(NSString *)message;
@end
@implementation MessageHandler
- (void)handleMessage:(NSString *)message {
NSLog(@"Received message: %@", message);
}
@end
int main(int argc, const char * argv[]) {
@autoreleasepool {
MessageManager *manager = [[MessageManager alloc] init];
manager.handler = [[MessageHandler alloc] init];
[manager sendMessage:@"Hello, world!"];
}
return 0;
}
```
（2）使用观察者模式
观察者模式是一种基于回调的消息转发方式，通过注册观察者对象，当特定事件发生时，通知观察者对象处理。以下是一个简单的示例：
```objective-c
@interface MessageManager : NSObject
@property (nonatomic, strong) NSMutableArray *observers;
@end
@implementation MessageManager
- (void)sendMessage:(NSString *)message {
for (id observer in self.observers) {
[observer messageReceived:message];
}
}
- (void)registerObserver:(id)observer {
[self.observers addObject:observer];
}
- (void)unregisterObserver:(id)observer {
[self.observers removeObject:observer];
}
@end
@interface MessageObserver : NSObject
- (void)messageReceived:(NSString *)message;
@end
@implementation MessageObserver
- (void)messageReceived:(NSString *)message {
NSLog(@"Received message: %@", message);
}
@end
int main(int argc, const char * argv[]) {
@autoreleasepool {
MessageManager *manager = [[MessageManager alloc] init];
MessageObserver *observer = [[MessageObserver alloc] init];
[manager registerObserver:observer];
[manager sendMessage:@"Hello, world!"];
[manager unregisterObserver:observer];
}
return 0;
}
```
2. 消息格式转换
消息格式转换是指将接收到的消息从一种格式转换为另一种格式。以下是一些常见的实现方式：
（1）使用JSON解析
JSON是一种轻量级的数据交换格式，常用于消息格式转换。以下是一个简单的示例：
```objective-c
NSString *jsonString = @"{\"name\":\"John\", \"age\":30}";
NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithString:jsonString options:NSJSONReadingMutableContainers error:nil];
NSString *name = jsonData[@"name"];
NSInteger age = [jsonData[@"age"] integerValue];
NSLog(@"Name: %@, Age: %ld", name, (long)age);
```
（2）使用XML解析
XML是一种标记语言，常用于消息格式转换。以下是一个简单的示例：
```objective-c
NSString *xmlString = @"John 30