UITextField应仅接受数字值
UITextField应仅接受数字值
提问于 2012-05-24 17:43:40
我有UITexfields，我希望它应该只接受数字其他显示警报，输入一个数字值。我希望motionSicknessTextFiled应该只接受数字
NSString*dogswithMotionSickness=motionSicknessTextField.text;
NSString*valueOne=cereniaTextField.text;
NSString*valueTwo=prescriptionTextField.text;
NSString*valueThree=otherMeansTextField.text;
NSString*valueFour=overtheCounterTextField.text;回答 14
Stack Overflow用户
回答已采纳
发布于 2012-05-24 17:45:57
在您从中获得这些值的任何UITextField中，您都可以指定当有人在文本字段内触摸时要显示的键盘类型。
例如纯数字键盘。
类似以下屏幕截图的：
在使用XIB和Xcode内置的Interface Builder时，这很容易设置，但如果您想通过编程来理解这一点，请看一下苹果的UITextInputTraits protocol reference page, specifically the keyboardType property信息。
要过滤掉标点符号，请设置文本字段的委托并设置shouldChangeCharactersInRange方法：
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSCharacterSet *numbersOnly = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
NSCharacterSet *characterSetFromTextField = [NSCharacterSet characterSetWithCharactersInString:textField.text];
BOOL stringIsValid = [numbersOnly isSupersetOfSet:characterSetFromTextField];
return stringIsValid;
}Stack Overflow用户
发布于 2014-03-14 19:22:41
Objective C
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if (!string.length)
return YES;
if (textField == self.tmpTextField)
{
NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
NSString *expression = @"^([0-9]+)?(\\.([0-9]{1,2})?)?$";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:expression
options:NSRegularExpressionCaseInsensitive
error:nil];
NSUInteger numberOfMatches = [regex numberOfMatchesInString:newString
options:0
range:NSMakeRange(0, [newString length])];
if (numberOfMatches == 0)
return NO;
}
return YES;
}Swift 3.0
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if !string.characters.count {
return true
}
do {
if textField == self.tmpTextField {
var newString = textField.text.replacingCharacters(inRange: range, with: string)
var expression = "^([0-9]+)?(\\.([0-9]{1,2})?)?$"
var regex = try NSRegularExpression(pattern: expression, options: NSRegularExpressionCaseInsensitive)
var numberOfMatches = regex.numberOfMatches(inString: newString, options: [], range: NSRange(location: 0, length: newString.characters.count))
if numberOfMatches == 0 {
return false
}
}
}
catch let error {
}
return true
}Stack Overflow用户
发布于 2012-05-24 17:47:10
[textField setKeyboardType:UIKeyboardTypeNumberPad];页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/10734959
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