Block Type

Return_Type  (^ Block_Name) (Parameters)

void (^ x) (void)  =   ^{
       NSLog(@"block--without--parameter--without--returntype");
};

    

    

void (^ xx) (int)  =  ^(int a){
        NSLog(@"bloc--with-one-parameter--without--returnType -- %d", a);
};

    

void (^ xxx) (int, NSString *)  =  ^(int a, NSString *s){
        NSLog(@"block--with-two-parameters--without--returnType - %d -- %@", a, s);
};

    

NSString* (^ xxxx) (int, NSString *)  =   ^(int a, NSString *s){

        NSString *ss = [NSString stringWithFormat:@"block--with--parameters--and--returntype %@ - %d", s, a];

        return ss; 

};