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数组转json 字符串

(lldb) po [[NSString alloc] initWithData: [NSJSONSerialization dataWithJSONObject:tmp options:NSJSONWritingPrettyPrinted error:nil] encoding:NSUTF8StringEncoding]

json 转数组

NSString *path = [[NSBundle mainBundle] pathForResource:@"city.json" ofType:nil];

NSArray *array = [NSJSONSerialization JSONObjectWithData:[NSData dataWithContentsOfFile:path] options:NSJSONReadingMutableLeaves error:nil];