UI基础_UITextView／UITextField_uitextview 禁止输入-优快云博客

本文介绍如何在iOS应用中使用UITextView禁用键盘弹出，并提供了UITextField中仅允许输入数字的有效实现方法。包括通过代理方法及正则表达式等手段进行输入验证。

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UITextView

一、使用textView时，禁止弹出键盘的方法
1.设置self.textView.editable = NO;
注：xib中的textView,也可在xib的右边的Behavior中取消选中的Editable
2.实现代理方法

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView {
    [textView resignFirstResponder];
    return NO;
}

UITextField

1.限制输入，只需要输入数字的几种方法总结

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    if (textField == self.textField){
        NSUInteger lengthOfString = string.length;
        for (NSInteger loopIndex = 0; loopIndex < lengthOfString; loopIndex++) {//只允许数字输入
            unichar character = [string characterAtIndex:loopIndex];
            if (character < 48) return NO; // 48 unichar for 0
            if (character > 57) return NO; // 57 unichar for 9
        }
    }
    return YES;
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    NSCharacterSet* tmpSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
    int i = 0;
    while (i < string.length) {
        NSString *newString = [string substringWithRange:NSMakeRange(i, 1)];
        NSRange range = [newString rangeOfCharacterFromSet:tmpSet];
        if (range.length == 0) {
            return  NO;
            break;
        }
        i++;
    }
    if (textField.text.length == 0 && [string isEqualToString:@"0"]) {

        return NO;
    }

    return YES;

}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    NSString *result = [textField.text stringByReplacingCharactersInRange:range withString:string];
    if (result.length == 0) return YES;
    NSString *regex = @"^[1-9][0-9]*$";
    NSPredicate *prd = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
    return [prd evaluateWithObject:result];
}