NSArray 转 NSString 转 NSArray，NSS

NSArray *stringArray = @[@"甲",@"已",@"丙",@"丁"];
NSString *arrrayString = [testArray componentsJoinedByString:@"-"];
NSLog输出：arrrayString
甲-已-丙-丁

NSString *string = @"甲-已-丙-丁";
NSArray  *stringArray = [string componentsSeparatedByString:@"-"];
NSLog输出：stringArray
(
    "\U7532",
    "\U5df2",
    "\U4e19",
    "\U4e01"
)

NSString*string =@"sdfsfsfsAdfsdf";
string = [string substringToIndex:7];//截取掉下标7之后的字符串
NSLog(@"截取的值为：%@",string);
[string substringFromIndex:2];//截取掉下标2之前的字符串
NSLog(@"截取的值为：%@",string);

2.匹配字符串
NSString*string =@"sdfsfsfsAdfsdf";
NSRangerange = [stringrangeOfString:@"f"];//匹配得到的下标
NSLog(@"rang:%@",NSStringFromRange(range));
string = [string substringWithRange:range];//截取范围类的字符串
NSLog(@"截取的值为：%@",string);

3.分隔字符串
NSString*string =@"sdfsfsfsAdfsdf";

NSArray *array = [string componentsSeparatedByString:@"A"]; //从字符A中分隔成2个元素的数组
NSLog(@"array:%@",array); //结果是adfsfsfs和dfsdf