金額入力フィールド

金額入力フィールドを作成について。
フォーマットは日本円（例: ¥100,000）
桁数は10桁まで制限しています。

VuewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UITextFieldDelegate>{
}

@property (nonatomic, weak) IBOutlet UITextField* priceField;

@end

VuewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    _priceField.delegate = self;

    [_priceField addTarget:self action:@selector(priceEditingStart:) forControlEvents:UIControlEventEditingDidBegin];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


// 金額入力スタート
-(void)priceEditingStart:(UITextField*)textField
{

    if([textField.text isEqualToString:@""]){
        [self textField:_priceField shouldChangeCharactersInRange:NSMakeRange(0,0) replacementString:@"0"];
    }

}


// 金額フォーマット
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSString *text             = _priceField.text;
    NSCharacterSet *charSet    = nil;
    NSString *numberChars      = @"0123456789";


    static NSNumberFormatter *numberFormatter;
    if (!numberFormatter)
    {
        numberFormatter = [[NSNumberFormatter alloc] init];
        numberFormatter.numberStyle             = NSNumberFormatterCurrencyStyle;
        numberFormatter.currencyCode            = @"JPY";
    }

    charSet = [NSCharacterSet characterSetWithCharactersInString:numberChars];
    NSCharacterSet *invertedCharSet = [charSet invertedSet];
    NSString *trimmedString = [string stringByTrimmingCharactersInSet:invertedCharSet];
    text = [text stringByReplacingCharactersInRange:range withString:trimmedString];

    text = [self deleteComma:text];

    if([text length] < 10){

        NSNumber *number = [numberFormatter numberFromString:text];

        if (number == nil)
        {
            number = [NSNumber numberWithInt:0];
        }

        textField.text = [numberFormatter stringFromNumber:number];

    }

    return NO;

}


// カンマの削除
- (NSString *)deleteComma:(NSString *)targetString;
{
    NSString *_mysetString = [NSString stringWithFormat:@"%@",targetString];
    NSString *_mysetString2= [_mysetString stringByReplacingOccurrencesOfString:@"," withString:@""];
    return _mysetString2;
}

@end