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working with blocks and function which takes block as a parameter in objective c

how to create a block in objective c

define a block in .h file 

/*here i created a block 

addPhysicsBody is the name of block

^ without is block can’t be completed 

so block is defined ^addPhysicsBody


typedef void (^addPhysicsBody)(CGPoint);

where void is return type and CGpoint is parameter
where bolded part is a parameter taken by block

2)  step 2

@property (copy) addPhysicsBody clickBlock;


add block as a property and please remember that this property is copy 
 because a block needs to be copied to keep track of its captured state outside of the original scope by apple 




define a function in .h file that takes block as a parameter this is necessary while creating block with function 

- (void)getPhysicsBody:(void (^)(CGPoint))finishBlock;
where above bolded part is block with its parameter 





- (void)getPhysicsBodyAtScene:(void (^)(CGPoint))finishBlock{
  
    //block passed to self.clickBlock property
    self.clickBlock=finishBlock;

  
}


4)step 4

 pass block

pass parameter to block  self.clickBlock

  self.clickBlock(location);

note use above syntax where you want to fire the block


5)
capture block

 [self getPhysicsBodyAtScene:^(CGPoint points) {
        //
        NSLog(@"%f",points.x);

    }];

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