微信发红包UITextField金额输入格式化

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

    NSString*text            =self.moneyTextField.text;

    NSString*decimalSeperator =@".";

    NSCharacterSet*charSet    =nil;

    NSString*numberChars      =@"0123456789";

    if([stringisEqualToString:decimalSeperator] && [textlength] ==0) {

        returnNO;

    }

    NSRangedecimalRange = [textrangeOfString:decimalSeperator];

    BOOLisDecimalNumber = (decimalRange.location!=NSNotFound);

    if(isDecimalNumber) {

        charSet = [NSCharacterSet characterSetWithCharactersInString:numberChars];

        if([stringrangeOfString:decimalSeperator].location!=NSNotFound) {

            returnNO;

        }

    }

    else{

        numberChars = [numberCharsstringByAppendingString:decimalSeperator];

        charSet = [NSCharacterSet characterSetWithCharactersInString:numberChars];

    }

    NSCharacterSet*invertedCharSet = [charSetinvertedSet];

    NSString*trimmedString = [stringstringByTrimmingCharactersInSet:invertedCharSet];

    text = [textstringByReplacingCharactersInRange:range withString:trimmedString];

    if(isDecimalNumber) {

        NSArray*arr = [textcomponentsSeparatedByString:decimalSeperator];

        if([arrcount] ==2) {

            if([arr[1]length] >2) {

                returnNO;

            }

        }

    }

    if(text.length>=7) {

        returnNO;

    }

    textField.text= text;

    return NO;

}