UITextField&UITextView使用梳理

只允许输入数字

TextField只允许输入数字
只允许输入数字和小数点

代码实现

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    
    return [self validateNumberByRegExp:string andTextFieldType:textField.tag] ;
    
}

- (BOOL)validateNumberByRegExp:(NSString *)string andTextFieldType:(NSInteger)type {
    
    BOOL isValid = YES;
    
    NSUInteger len = string.length;
    
    if (len > 0) {
        
        NSString *numberRegex = (type == textFieldMoneyType) ? @"^[0-9]*((\\.|,)[0-9]{0,2})?$" :@"^[0-9]*$";
        
        NSPredicate *numberPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", numberRegex];
        
        isValid = [numberPredicate evaluateWithObject:string];
        
    }
    
    return isValid;
    
}

限制位数

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if (textField.tag == 1000) {
        //控制字数限制在18位，多余位数无法输入
        if (range.location >= 18)
        {
            if ([string isEqualToString:@"\n"])
            {
                [textField resignFirstResponder];
                return NO;
            }
             return NO;
        }
    }
    if ([string isEqualToString:@"\n"])
    {
        [textField resignFirstResponder];
        return NO;
    }
    return YES;
}

===================================================

UITextView 输入范围缩进

textView.textContainerInset = UIEdgeInsetsMake(10, 10, 10, 10);

参考文章
iOS开发－UITextView高度自适应
UITextView高度计算不正确
====================================================

UITextView行间距与字体设置

UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(20, 100, 100, 200)];

// ……此处可进行其它设置 ……

  NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
  paragraphStyle.lineSpacing = 5;// 字体的行间距

  NSDictionary *attributes = @{
                                 NSFontAttributeName:[UIFont systemFontOfSize:17], //字体设置
                                 NSParagraphStyleAttributeName:paragraphStyle
                                 };
  textView.attributedText = [[NSAttributedString alloc] initWithString:textView.text attributes:attributes];

参考文章
iOS之UITextView设置行间距