如何进行验证以避免textField中的空格？

Question

如何替换此行

[txtEmail.textstringByTrimmingCharactersInSet[NSCharacterSetwhitespaceAndNewlineCharacterSet]].length == 0`

任何功能。

if ([txtEmail.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]].length == 0 && 
   [txtPassword.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]].length == 0)
{

}
else if ([txtEmail.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]].length == 0)
{

}

有什么建议吗？

Answer 1

alternateWay

＆＃xA;＆＃xA;

  txtEmail.text = [txtEmail.text stringByReplacingOccurrencesOfString：@“”withString：@“”];＆ #xA;＆＃xA; if（txtEmail.text.length == 0）＆＃xA; {＆＃xA; // show alert＆＃xA;}＆＃xA; else＆＃xA; {＆＃xA; //在这里做你的东西＆＃xA;}＆＃xA;  

＆＃xA;＆＃xA;

选项-2

＆＃xA ;＆＃xA;

  if（[txtEmail.text rangeOfCharacterFromSet：[NSCharacterSet whitespaceCharacterSet]]。location！= NSNotFound）＆＃xA; {＆＃xA; NSLog（@“white space found”）;＆ #xA;}＆＃XA;  

＆＃XA;

Answer 2

NSRange range = [rawString rangeOfCharacterFromSet:whitespace];
if (range.location != NSNotFound) {
    //whitespace Found.
}