在iphone中拆分随机字符串

Question

I have a string with random numbers,

like "12345678912234"

I want to split it into 4 parts, like,

string1 = 123

string2 = 456

string3 = 7891

string4 = 2234

anybody has any idea??

I've tried using NSRange but I cannot get it. May be I'm using it wrong.

I also tried using substringToIndex but it failed too.

Answer 1

I think you need to use substringWithRange.

Answer 2

-(NSString *)splitString:(NSString *)string fromX:(int)x toY:(int)y
{
    NSRange range = { x, y};
    return [string substringWithRange:range];
}


        NSLog([self splitString:@"12345678912234" fromX:0 toY:3]);
        NSLog([self splitString:@"12345678912234" fromX:3 toY:3]);
        NSLog([self splitString:@"12345678912234" fromX:6 toY:4]);
        NSLog([self splitString:@"12345678912234" fromX:10 toY:4]);

Just tested it:) Works fine. (Just to clarify: I have named the function incorrectly as it is not toY but how many characters you want to take in from X).