iOS 读取Json 代码

    NSString* path = [[NSBundle mainBundle] pathForResource: @"Sandwiches"
                                                     ofType: @"json"];
    NSString* data = [NSString stringWithContentsOfFile: path
                                               encoding: NSUTF8StringEncoding
                                                  error: nil];
    
    NSData* resultData = [data dataUsingEncoding:NSUTF8StringEncoding];
    _sandwiches = [NSJSONSerialization JSONObjectWithData:resultData
                                                       options:kNilOptions
                                                         error:nil];