BRStringPickerView 优化一处逻辑 #61
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1.直接修改selectValueArr对应的component位置的值就行了,感觉没有必要创建一个新的容器。
2. didSelectRow 这个方法调用的频率非常高，每次都创建新数组，有点浪费，相对来说也会导致内存增加
3.个人建议： self.selectValueArr[component] = self.dataSourceArr[component][row];//直接修改
4.selectValueArr 是一个可数组，不需要copy.