获得样式标记

Question

我想在我的样式标签之间使用数组获取样式，但我得到空数组。

 NSScanner* scanners = [NSScanner scannerWithString:replacement];
                NSMutableArray *style = [[NSMutableArray alloc] init];
                [scanner scanUpToString:@"<style" intoString:nil];
                while (![scanner isAtEnd]) {
                    [scanners scanUpToString:@">" intoString:nil];
                    [scanners scanString:@">" intoString:nil];
                    NSString * text = nil;
                    [scanners scanUpToString:@"</style>" intoString:&text];
                    if (text) { // if html contains empty paragraphs <p></p>, text could be nil
                        [style addObject:text];
                        NSLog(@"%@",style);
                    }
                    [scanners scanUpToString:@"<style" intoString:nil];
                }

Answer 1

        NSMutableArray *substrings = [[NSMutableArray alloc]init];
        NSScanner *scanners = [NSScanner scannerWithString:aString];
        [scanners scanUpToString:@"<style type=" intoString:nil]; // Scan all characters before <ol>
        while(![scanners isAtEnd])
        {
            NSString *substring = nil;
            [scanners scanString:@"<style type=" intoString:nil]; // Scan the <ol> character
            if([scanners scanUpToString:@"</style>" intoString:&substring])
            {
                // If the space immediately followed the <ol>, this will be skipped
                [substrings addObject:substring];
            }
            [scanners scanUpToString:@"<style type=" intoString:nil]; // Scan all characters before next <ol>
        }
        NSLog(@"%@",substrings);

        NSString *stylesheets=[substrings objectAtIndex:0];
        NSString *myStrings = @"<style type=";
        NSString *tests = [myStrings stringByAppendingString:stylesheets];
        NSLog(@"%@",tests);
        NSString *finalstyle=[tests stringByAppendingString:@"</style>"];

        NSLog(@"%@",finalstyle);