Objective c 如何在Objective C中解析字符串

有人能帮我从目标C中的字符串“/Date（1242597600000）/”中提取int timestamp值吗

我想要1242597600000

Thx一种简单的方法：

NSString *timestampString = @"\/Date(1242597600000)\/";
NSArray *components = [timestampString componentsSeparatedByString:@"("];
NSString *afterOpenBracket = [components objectAtIndex:1];
components = [afterOpenBracket componentsSeparatedByString:@")"];
NSString *numberString = [components objectAtIndex:0];
long timeStamp = [numberString longValue];

或者，如果您知道字符串的长度和格式始终相同，则可以使用：

NSString *numberString = [timestampString substringWithRange:NSMakeRange(7,13)];

还有另一种方法：

NSRange openBracket = [timestampString rangeOfString:@"("];
NSRange closeBracket = [timestampString rangeOfString:@")"];
NSRange numberRange = NSMakeRange(openBracket.location + 1, closeBracket.location - openBracket.location - 1);
NSString *numberString = [timestampString substringWithRange:numberRange];

---

做这件事的方法不止一种。这里有一个使用NSScanner的建议

NSString *dateString = @"\/Date(1242597600000)\/";
NSScanner *dateScanner = [NSScanner scannerWithString:dateString];
NSInteger timestamp;

if (!([dateScanner scanInteger:&timestamp])) {
    // scanInteger returns NO if the extraction is unsuccessful
    NSLog(@"Unable to extract string");
}

// If no error, then timestamp now contains the extracted numbers.

---

这是一种方法。我是一个NSScanner瘾君子=）这不能提取数字。由于

\/日期（

前缀。编辑后将

NSRangeMake

更改为

NSMakeRange

，因此失败。

NSCharacterSet* nonDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
NSString* digitString = [timestampString stringByTrimmingCharactersInSet:nonDigits];
return [digitString longValue];