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                            ~~~
  NSArray *arr = @[@{@"city":@"beijing",@"person":@{@"name":@"zhangsan"}},@{@"city":@"chengdu"}];
    NSArray *resultArr = [arr valueForKeyPath:@"city"]; //可以獲取到city數組 @[@"beijing",@"chengdu"]
    NSLog(@"%@",resultArr);
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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