IOS 字符串中去除特殊符号 stringByTrimmingCharactersInSet 应该用于账号登录等

先上个例子NSString * str1 =[nameInput.text stringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet]];NSString * str2 =[passwdInput.text stringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet]];[self.delegate loginActionInView:self name:str1 passwd:str2];
在ios中 可以使用stringByTrimmingCharactersInSet函数过滤字符串中的特殊符号首先自己定义一个NSCharacterSet, 包含需要去除的特殊符号NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString:@"@「」、[]{}#%-*+=_\\|~$^'@#$%^&*()_+'\""];由于NSString中有全角符号和半角符号, 因此有些符号要包括全角和半角的然后调用stringByTrimmingCharactersInSetNSString *trimmedString = [string stringByTrimmingCharactersInSet:set];trimmedString就是过滤后的字符串

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去除 username中的空格table newlinenextline
代码如下三行代码

NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet];

NSString * username = [mUsernameField stringValue];

username = [username stringByTrimmingCharactersInSet:whitespace];

注释

stringByTrimmingCharactersInSet:
Returns a new string made by removing from both ends of the receiver characters contained in a given character set.

whitespaceAndNewlineCharacterSet
Returns a character set containing only the whitespace characters space (U+0020) and tab (U+0009) and the newline and nextline characters (U+000A–U+000D, U+0085).

另外可以用 whitespaceCharacterSet 替换 whitespaceAndNewlineCharacterSet 区别newline nextline
whitespaceCharacterSet
Returns a character set containing only the in-line whitespace characters space (U+0020) and tab (U+0009).

NSString *temptext = [messageTextField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSString *text = [temptext stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet ]];

第1行是去除2端的空格第2行是去除回车