在开发中我们有时候会对UITextFiled 进行一些操作，说一下如何只输入中文，或者 只输入 数字 和英文 2中方法
我直接用宏定义定义：
#define kAlphaNum @"abcdefghijklmnopqrstuvwxyz" //这种是对应只输入中文 不允许其他数字或者符号的
#define kEnglishNum @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" //这种是对应只能输入数字和英文的方法
执行UITextField 的delegate 方法 切记 textFiled.delegate = self;
下面直接上代码:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
UITextField *nameField = (UITextField *)[self viewWithTag:200];
UITextField *cardField = (UITextField *)[self viewWithTag:201];
if (textField == nameField) {
//只允许输入中文
NSCharacterSet *cs;
cs = [[NSCharacterSet characterSetWithCharactersInString:kAlphaNum] invertedSet];
NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
BOOL basic = [string isEqualToString:filtered];
NSString *text = [textField.text stringByReplacingCharactersInRange:range withString:string];
if (_delegate && [_delegate respondsToSelector:@selector(passName:)]) {
[_delegate passName:text];
}
return basic;
}
if (textField == cardField) {
//只允许输入英文和数字
NSCharacterSet *cs;
cs = [[NSCharacterSet characterSetWithCharactersInString:kEnglishNum] invertedSet];
NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
BOOL basic = [string isEqualToString:filtered];
NSString *text = [textField.text stringByReplacingCharactersInRange:range withString:string];
if (_delegate && [_delegate respondsToSelector:@selector(passCard:)]) {
[_delegate passCard:text];
}
return basic;
}
return YES;
}
原文：http://blog.csdn.net/longshiqing14/article/details/45370049