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我的博文的完整配套代码。
创建NSInvocationOperation对象:
@interface OQCreateInvocationOperation : NSObject
- ( NSInvocationOperation *) invocationOperationWithData : ( id ) data ;
- ( NSInvocationOperation *) invocationOperationWithData : ( id ) data userInput : ( NSString *) userInput ;
@end
@implementation OQCreateInvocationOperation
- ( NSInvocationOperation *) invocationOperationWithData : ( id ) data {
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