对输入钱数的textField的设置

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

{

NSRange aRange = [textField.text rangeOfString:@"."];

if (aRange.location != NSNotFound && [string isEqualToString:@"."]) {

return NO;

}

NSMutableString * futureString = [NSMutableString stringWithString:textField.text];

[futureString  insertString:string atIndex:range.location];

NSInteger flag = 0;

const NSInteger limited = 2;//小数点后需要限制的个数

for (NSInteger i = futureString.length - 1; i>= 0; i--) {

if ([futureString characterAtIndex:i] == '.') {

if (flag > limited) {

return NO;

}

break;

}

flag++;

}

return YES;

}

- (void) textFieldDidEndEditing:(UITextField *)textField{

if (textField.text.length) {

NSDecimalNumber *decimalNumber = [NSDecimalNumber decimalNumberWithString:textField.text];

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];

numberFormatter.numberStyle = NSNumberFormatterCurrencyStyle;

numberFormatter.currencySymbol = @"";

textField.text = [numberFormatter stringFromNumber:decimalNumber];

}

}