Question

我需要知道文件名exp中我的图像有多么简洁：我有图像电话：第一档： Splash_10001.jpg 最后一档： Splash_10098.jpg 我想插入阵列..

 for(int i = 1; i <= IMAGE_COUNT; i++)
{
    UIImage* image = [UIImage imageNamed:[NSString stringWithFormat:@"%@%04d.%@",self.firstImageName,i,self.imageType]];
    NSLog(@"%d",i);
    [imgArray addObject:image];
}

我想用数字98替换IMAGE_COUNT但是我需要从用户发送给我的字符串中获取numbre：Splash_10098.jpg 我需要将Splash_10098.jpg分成：nsstring：Splash_1 int：0098 nsstring：jpg 10倍全部！

Answer 1

这取决于授予字符串的输入。在下面我将搜索点并向后移动到最大数字。顺便说一句，我只建议使用多语言NumberFormatter而不是依赖于默认转换。

  NSString * input = @"Splash_19001.jpg";
  NSRange r = [input rangeOfString:@"."];
  if(r.location>4){
    NSString * numberPart = [input substringWithRange: NSMakeRange(r.location-4,4)];
    NSNumberFormatter *nf = [[NSNumberFormatter alloc] init];
    [nf setNumberStyle:NSNumberFormatterDecimalStyle];
    NSNumber * number = [nf numberFromString:numberPart];
    int val = [number intValue];
    NSLog(@"intValue=%d",val);
  }

Answer 2

我认为这就是你要找的东西

NSString *stringUserSendsYou = @"Splash_10098.jpg";
int IMAGE_COUNT = [[[stringUserSendsYou stringByReplacingOccurrencesOfString:@"Splash_1" withString:@""] stringByReplacingOccurrencesOfString:@".jpg" withString:@""] integerValue];

Answer 3

如果数字长度在后缀中固定，则使用子字符串而不是尝试删除前缀是有意义的。剥离扩展并抓取最后x个字符，将它们转换为带有intValue或iOS建议的NSNumberFormatter的int，但如果您确定字符串的格式，则可能没有必要。 / p>

NSString *userProvidedString = @"Splash_10001.jpg";
NSString *numberString = [userProvidedString stringByDeletingPathExtension];
NSUInteger length = [numberString length];
NSInteger numberLength = 4;
if (length < numberLength)
{
     NSLog(@"Error in the string");
     return;
}
numberString = [numberString substringWithRange: NSMakeRange(length - 4, 4)];
NSInteger integer = [numberString integerValue];
// Do whatever you want with the integer.

Answer 4

使用Regex（iOS中的NSRegularExpression），这可以非常轻松地完成，

检查一下，

NSError *error = NULL;
NSString *originalString = @"Splash_10098.jpg";
NSString *regexString = @"([^\?]*_[0-9])([0-9]*)(.)([a-z]*)";

NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:regexString options:NSRegularExpressionCaseInsensitive error:&error];
NSTextCheckingResult *match = [regex firstMatchInString:originalString options:NSRegularExpressionCaseInsensitive range:NSMakeRange(0, [originalString length])];

NSLog(@"FileName: %@", [originalString substringWithRange:[match rangeAtIndex:1]]);
NSLog(@"Total Count: %@", [originalString substringWithRange:[match rangeAtIndex:2]]);
NSLog(@"File type: %@", [originalString substringWithRange:[match rangeAtIndex:4]]);

<强>结果：

FileName: Splash_1
Total Count: 0098
File type: jpg

如何从文件名中查找图像数量？

4 个答案: