Question

怎么给TextField输入框左边加入图

Answer 1

两个代理方法 一个是点击return 缩回键盘
还有一个是对textField的输入进行监听
前提是需要对textField进行代理监听
//UITextFieldDelegate
- (BOOL)textFieldShouldReturn:(UITextField *)textField;
{
//用户结束输入
[textField resignFirstResponder];

return YES;
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange NSRange)range replacementString NSString*)string // return NO to not change text
{
//判断是否超过 ACCOUNT_MAX_CHARS 个字符,注意要判断当string.leng>0
//的情况才行，如果是删除的时候，string.length==0
int length = textField.text.length;
if (length >= ACCOUNT_MAX_CHARS && string.length >0)
{
return NO;
}

NSCharacterSet *cs;
cs = [[NSCharacterSet characterSetWithCharactersInString:kAlphaNum] invertedSet];
NSString *filtered =
[[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
BOOL basic = [string isEqualToString:filtered];
return basic;
}

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