How to call a method that include a block as a parameter and NSString as the block parameter

Question

I have a method like this

-(void)GetPostPreperation :(NSMutableURLRequest *)request :(BOOL)isGet :(NSMutableDictionary *)jsonBody :(void(^)(NSString*)) compblock

how can I pass parameter into this within a block? I tried like this. but it giving me an syntax error, Expected Expression

This is the way I tried

 [self GetPostPreperation:request :isGet :jsonBody :(^NSString*)str
 {
     return str;

 }];

This is how I defined my block

typedef void(^myCompletion)(NSString *);

I want to assign a NSString value to the block parameter within my GetPostPreperation method and check and return it from the block calling method.How can I do this? Please help me. Thanks

Answer 1

Use it in this way,here str is an input not return

[self GetPostPreperation:request :true : jsonBody :^(NSString * str) {
        //here use
        NSLog(@"%@",str);

    }];

Update

do not return anything from this block.The block type is void(^)(NSString*),the return is void