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ctblockdescription's Introduction

CTBlockDescription

执行完class-dump之后,获得的头文件中所有的block都会写成CDUnknownBlockType

使用CTBlockDescription就可以打印出block的参数了

    NSMethodSignature *signature = [[[CTBlockDescription alloc]initWithBlock:arg] blockSignature];
    NSLog(@"block arg %@", [signature description]);

######分析一下三个参数:

  • 第一个参数@? block底层调用的时候默认以block结构体自身作为第一个隐含参数
  • 第二个参数类型是NSURLSessionDataTask
  • 第三个参数是id

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