objective-c - 如何在 NSMutableString 中修剪“”和“\n”

Question

如何修剪 NSMutableString 中的“”和“\n”？

Answer 1

NSCharacterSet* charsToTrim = [NSCharacterSet characterSetWithCharactersInString:@" \n"];
NSString* trimmedStr = [aStr stringByTrimmingCharactersInSet:charsToTrim];

Answer 2

我知道这是一个老问题，但是是的，可以修剪可变字符串而无需返回新字符串。你只需要一个正则表达式，下面的例子：

NSMutableString *mutable = [NSMutableString stringWithString:@" String to trim    \n"];

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\n|  | $|^ " options:0 error:nil];
[regex replaceMatchesInString:mutable options:0 range:NSMakeRange(0, [mutable length]) withTemplate:@""];

Answer 3

如何调用 replaceOccurrencesOfString:withString:options:range 两次，用什么都替换 " " 然后 "\n"？

Answer 4

NSString *trimmed = [yourString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];