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1. 字符串与数组互转

OC

NSMutableString * str=[[NSMutableString alloc]initWithFormat:@"1,1,1,1,1,1"];
//字符串转变为数组
NSMutableArray * array=[NSMutableArray arrayWithArray:[str componentsSeparatedByString:@","]];
//把数组转换成字符串
NSString *ns=[array componentsJoinedByString:@","];

Swift

import UIKit

let str = "1,1,1,1,1"
//字符串转变为数组
let array =  ",")
//把数组转换为字符串
let ns = array.joined(separator: ",")

2.

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