如何在输入时更改UITextField
文字的值?
换句话说:
当我输入1时,它应显示1
当我键入10时,它应显示10
当我输入100时,它应显示100 但
当我输入1000时,它应显示1,000
你能说出任何想法吗?
答案 0 :(得分:17)
在文本字段控件中添加“textFieldDidChange”通知方法。
[textField addTarget:self
action:@selector(textFieldDidChange:)
forControlEvents:UIControlEventEditingChanged];
-(void)textFieldDidChange:(UITextField *)theTextField
{
NSLog(@"text changed: %@", theTextField.text);
NSString *textFieldText = [theTextField.text stringByReplacingOccurrencesOfString:@"," withString:@""];
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
NSString *formattedOutput = [formatter stringFromNumber:[NSNumber numberWithInt:[textFieldText integerValue]]];
textField.text=formattedOutput;
}
答案 1 :(得分:3)
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init] ;
if([string length]==0)
{
[formatter setGroupingSeparator:@","];
[formatter setGroupingSize:4];
[formatter setUsesGroupingSeparator:YES];
[formatter setSecondaryGroupingSize:3];
NSString *num = textField.text ;
num = [num stringByReplacingOccurrencesOfString:@"," withString:@""];
NSString *str = [formatter stringFromNumber:[NSNumber numberWithDouble:[num doubleValue]]];
textField.text = str;
return YES;
}
else {
[formatter setGroupingSeparator:@","];
[formatter setGroupingSize:2];
[formatter setUsesGroupingSeparator:YES];
[formatter setSecondaryGroupingSize:3];
NSString *num = textField.text ;
if(![num isEqualToString:@""])
{
num = [num stringByReplacingOccurrencesOfString:@"," withString:@""];
NSString *str = [formatter stringFromNumber:[NSNumber numberWithDouble:[num doubleValue]]];
textField.text = str;
NSLog(@"add:%@",str);
}
return YES;
}
}
P.S。此代码位于ARC
,负责非弧环境下的内存管理。
答案 2 :(得分:1)
添加操作:
self.amountTextField.addTarget(self, action: #selector(textFieldDidChange(textField:)), for: .editingChanged)
实际情况:
@objc func textFieldDidChange(textField: UITextField) {
if textField == amountTextField {
var textFormatted = textField.text?.replacingOccurrences(of: ".", with: "")
textFormatted = textFormatted?.replacingOccurrences(of: ".", with: "")
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
if let text = textFormatted, let intVal = Int(text) {
textField.text = formatter.string(from: NSNumber(value: intVal))
}
}
}
答案 3 :(得分:0)
<强>夫特:强>
务必选择文本字段输入数字键盘,然后:
在viewDidLoad中:
yourTextField(self, action: #selector(self.textFieldDidChange(textField:)), for: .editingChanged)
然后,在同一个视图控制器中:
func textFieldDidChange(textField: UITextField) {
if textField == yourTextField {
// Some locales use different punctuations.
var textFormatted = textField.text?.replacingOccurrences(of: ",", with: "")
textFormatted = textFormatted?.replacingOccurrences(of: ".", with: "")
let numberFormatter = NumberFormatter()
numberFormatter.numberStyle = .decimal
if let text = textFormatted, let textAsInt = Int(text) {
textField.text = numberFormatter.string(from: NSNumber(value: textAsInt))
}
}
}
答案 4 :(得分:-2)
试试这个..您可以在ViewDidLoad
方法中编写以下行并将代理人提供给文本字段。
[textField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
并编写以下方法。
-(void)textFieldDidChange:(UITextField*)textfield{
NSLog(@"here %@",textfield.text);
if ([textfield.text isEqualToString:@"1000"]) {
textfield.text=@"1,000";
}
}