UITextField应该只有正数 [英] UITextField should have only positive number

问题描述

我需要验证 UITextField 。我只想在其中输入正整数。我怎样才能实现这一目标？

I need to validate a UITextField. I want only positive integers to be entered in it. How can I achieve that?

推荐答案

添加UITextFieldDelegate，并将此代码添加到您的班级

Add UITextFieldDelegate,and add this code to your class

#define LEAGELNUM @"0123456789"
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
        NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:LEAGELNUM] invertedSet];
        NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs]     componentsJoinedByString:@""];
        BOOL basicTest = [string isEqualToString:filtered];
        return basicTest;
}

LEAGELNUM表示你只能写这些单词

LEAGELNUM means you can only write these words

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