xcode 打字时如何将文本字段格式设置为十进制？
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How to set the textfield format as decimal while typing?
提问by Developer
In my app i have one text field and when i click on that text field numeric keypad will open.now my question is how to convert that value in decimal format while typing as i have to insert only decimal values and in numeric keypad dot(.)is not given.so when user type in textfield it automatically convert that value into decimal format.
在我的应用程序中，我有一个文本字段，当我单击该文本字段时，数字小键盘将打开。现在我的问题是如何在键入时将该值转换为十进制格式，因为我必须仅插入十进制值和数字小键盘点 (. ) 未给出。因此，当用户在文本字段中键入时，它会自动将该值转换为十进制格式。
Suppose if user type 5078it will show 50.78format while typing.
假设如果用户键入5078，它将在键入时显示50.78格式。
回答by EmptyStack
You can simply multiply the number by "0.01" (for two decimal places) and use the string format "%.2lf". Write the following code in textField:shouldChangeCharactersInRange:withString:method.
您可以简单地将数字乘以“ 0.01”（两位小数）并使用字符串格式“ %.2lf”。在textField:shouldChangeCharactersInRange:withString:方法中编写以下代码。
NSString *text = [textField.text stringByReplacingCharactersInRange:range withString:string];
text = [text stringByReplacingOccurrencesOfString:@"." withString:@""];
double number = [text intValue] * 0.01;
textField.text = [NSString stringWithFormat:@"%.2lf", number];
return NO;
回答by userar
try this.
尝试这个。
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range
replacementString:(NSString *)string {
double currentValue = [textField.text doubleValue];
double cents = round(currentValue * 100.0f);
if ([string length]) {
for (size_t i = 0; i < [string length]; i++) {
unichar c = [string characterAtIndex:i];
if (isnumber(c)) {
cents *= 10;
cents += c - '0';
}
}
} else {
// back Space
cents = floor(cents / 10);
}
textField.text = [NSString stringWithFormat:@"%.2f", cents / 100.0f];
if(cents==0)
{
textField.text=@"";
return YES;
}
return NO;
}
回答by Eduardo Fabricio
Thanks userar, it works fine for me. Im my case i need to format the decimal like a currency localized format when finish the editing.
感谢用户，它对我来说很好用。我的情况是，我需要在完成编辑后将小数格式化为货币本地化格式。
- (BOOL) textFieldShouldEndEditing:(UITextField *)textField {
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.numberStyle = NSNumberFormatterCurrencyStyle;
// im my case i need specify the currency code,
// but could have got it from the system.
formatter.currencyCode = @"BRL";
NSDecimalNumber *decimalNumber =
[NSDecimalNumber decimalNumberWithString:textField.text];
// keeping the decimal value for submit to server.
self.decimalValue = decimalNumber;
// formatting to currency string.
NSString * currencyString = [formatter stringFromNumber:decimalNumber];
textField.text = currencyString;
}
}
