图片数组的互相转换

//字符串转变为数组1

NSMutableString* str=[[NSMutableStringalloc]initWithFormat:@"1,1,1,1,1,1"];

//字符串转变为数组2

NSMutableArray* array=[NSMutableArrayarrayWithArray:[str   componentsSeparatedByString:@","]];

//替换数组中的某个值

[array replaceObjectAtIndex:4 withObject:@"2"];

//把数组转换成字符串

NSString*ns=[array componentsJoinedByString:@","];