1. 限制輸入框內(nèi)只能是數(shù)字和字母
[textField addTarget:self action:@selector(textFieldDidchange:) forControlEvents:UIControlEventEditingChanged];
- (void)textFieldDidchange:(UITextField *)textField {
NSString *textString = textField.text;
if (![self inputShouldLetterOrNum:textString] && textString.length > 0) {
YFAlertMessage(@"只能是數(shù)字或者字母!");
textField.text = self.currentText;
return;
}
self.currentText = textString;
}
2. 判斷全漢字
- (BOOL)inputShouldChinese:(NSString *)inputString {
if (inputString.length == 0) return NO;
NSString *regex = @"[\u4e00-\u9fa5]+";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
return [pred evaluateWithObject:inputString];
}
3. 判斷全數(shù)字：
- (BOOL)inputShouldNumber:(NSString *)inputString {
if (inputString.length == 0) return NO;
NSString *regex =@"[0-9]*";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
return [pred evaluateWithObject:inputString];
}
4. 判斷全字母：
- (BOOL)inputShouldLetter:(NSString *)inputString {
if (inputString.length == 0) return NO;
NSString *regex =@"[a-zA-Z]*";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
return [pred evaluateWithObject:inputString];
}
5. 判斷僅輸入字母或數(shù)字：
- (BOOL)inputShouldLetterOrNum:(NSString *)inputString {
if (inputString.length == 0) return NO;
NSString *regex =@"[a-zA-Z0-9]*";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
return [pred evaluateWithObject:inputString];
}
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