swift版本限制金额输入（两位小数）
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if string == "." && textField.text?.count == 0 {
textField.text = "0."
}
let newString = (textField.text! as NSString).replacingCharacters(in: range, with: string)
let expression = "^[0-9]*((\\.|,)[0-9]{0,2})?$"
let regex = try! NSRegularExpression(pattern: expression, options: NSRegularExpression.Options.allowCommentsAndWhitespace)
let numberOfMatches = regex.numberOfMatches(in: newString, options:NSRegularExpression.MatchingOptions.reportProgress, range: NSMakeRange(0, (newString as NSString).length))
return numberOfMatches != 0
}
OC版本限制金额输入
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString: (NSString *)string{
// 限制只能输入数字
BOOL isHaveDian = YES;
if ([string isEqualToString:@" "]) {
return NO;
}
if ([textField.text rangeOfString:@"."].location == NSNotFound) {
isHaveDian = NO;
}
if ([string length] > 0) {
unichar single = [string characterAtIndex:0];//当前输入的字符
if ((single >= '0' && single <= '9') || single == '.') {//数据格式正确
if([textField.text length] == 0){
if(single == '.') {
[textField.text stringByReplacingCharactersInRange:range withString:@""];
return NO;
}
}
//输入的字符是否是小数点
if (single == '.') {
if(!isHaveDian)//text中还没有小数点
{
isHaveDian = YES;
return YES;
}else{
[textField.text stringByReplacingCharactersInRange:range withString:@""];
return NO;
}
}else{
if (isHaveDian) {//存在小数点
//判断小数点的位数
NSRange ran = [textField.text rangeOfString:@"."];
if (range.location - ran.location <= 2) {
return YES;
}else{
return NO;
}
}else{
return YES;
}
}
}else{//输入的数据格式不正确
[textField.text stringByReplacingCharactersInRange:range withString:@""];
return NO;
}
}
else
{
return YES;
}
}
