NSString* expectedString = nil;
if([givenString hasPrefix:@"*"])
{
   expectedString = [givenString substringFromIndex:1];
}

你可以使用NSString的-hasPrefix:方法:

objective - c:

NSString* output = nil;
if([string hasPrefix:@"*"]) {
    output = [string substringFromIndex:1];
}

迅速:

var output:String?
if string.hasPrefix("*") {
    output = string.substringFromIndex(string.startIndex.advancedBy(1))
}

这可能有用吗?：）

http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html / / apple_ref / occ instm / NSString / characterAtIndex:

只需搜索索引为0的字符，并将其与您正在寻找的值进行比较!

NSString* expectedString = nil;
if([givenString hasPrefix:@"*"])
{
   expectedString = [givenString substringFromIndex:1];
}

NSString *stringWithoutAsterisk(NSString *string) {
    NSRange asterisk = [string rangeOfString:@"*"];
    return asterisk.location == 0 ? [string substringFromIndex:1] : string;
}

使用characterAtIndex:。如果第一个字符是星号，使用substringFromIndex:获取不带'*'的字符串。