如何判断一个类是否实现了某个protocol

使用-conformsToProtocol:函数，具体用法如下：

@protocol MyProtocol <NSObject>@required- (void)onUpdate;@end@interface ProtocolTest : NSObject<MyProtocol>- (void)onUpdate;@end@interface ProtocolTestChildClass : ProtocolTest@end

调用：

ProtocolTestChildClass *protocolChild = [[ProtocolTestChildClass alloc] init];BOOL hasProtocol = [protocolChild conformsToProtocol:@protocol(MyProtocol)];CCLOG(@"has protocol = %d", hasProtocol);

结果：

has protocol = 1