如何使用NSNumberFormatter货币在UITextField中打印

Question

我在这里是N00b。

我这样打印我的货币：

-(IBAction)buttonPressed1:(id)sender
    {
        double currency = [Amount1.text doubleValue] + [Amount2.text doubleValue]; 
        SumCurrency.text = [NSString stringWithFormat:@"%0.0f", answer];
    }

[我只想简单地使用NSSNumberFormatter以美国货币格式打印SumCurrency.text ..遇到很多麻烦..请hekp

同一期？？？ http://groups.jonzu.com/z_apple_using-a-nsnumberformatter-with-a-uitextfield.html

预先感谢。

关于，N00b

Answer 1

我得到了答案..但仅供以后参考

-(IBAction)buttonPressed1:(id)sender {
     double currency = [Amount1.text doubleValue] + [Amount2.text doubleValue]; 
     NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];                
     [numberFormatter setNumberStyle: NSNumberFormatterCurrencyStyle];
     NSString *numberAsString = [numberFormatter stringFromNumber:[NSNumber numberWithFloat:currency]];
     SumCurrency.text = [NSString stringWithFormat:@"Converted:%@",numberAsString]; 
}

或在Swift中：

let amount = 123.56
let formatter = NumberFormatter()
formatter.locale = Locale.current
// or
// f.locale = Locale(identifier: "it_IT")
formatter.numberStyle = .currency

let formattedAmountSting = formatter.string(for: amount)!

Answer 2

这是Objective-C中类别发光的情况的示例。

最干净的解决方案是为NSNumber创建一个类别。 .h：

@interface NSNumber (Formatter)

- (NSString *)currencyStringValue;

@end

和.m：

@implementation NSNumber (Formatter)

- (NSString *)currencyStringValue
{
    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
    formatter.locale = [NSLocale currentLocale];
    formatter.numberStyle = NSNumberFormatterCurrencyStyle;

    return [formatter stringFromNumber:self];
}

@end

在您的代码中，您必须#import“ NSNumber + Formatter.h”并只需执行以下操作：

- (IBAction)buttonPressed1:(id)sender
{
    double total = [Amount1.text doubleValue] + [Amount2.text doubleValue];
    NSNumber *totalNumber = [NSNumber numberWithDouble:total];
    SumCurrency.text = totalNumber.currencyStringValue;
}

非常干净。

Answer 3

NSNumberFormatter * fmt;
NSNumber          * n;

fmt = [ [ NSNumberFormatter alloc ] init ];
n   = [ NSNumber numberWithFloat: 10 ];

[ fmt setFormatterBehavior: NSNumberFormatterBehavior10_4 ];
[ fmt setCurrencySymbol: @"$" ];
[ fmt setNumberStyle: NSNumberFormatterCurrencyStyle ];

NSLog( @"%@", [ fmt stringFromNumber: n ];

[ fmt release ] /* Thanx willcodejavaforfood... My mistake ; ) */

Answer 4

将浮点数或双精度（浮点运算）与金钱一起使用是一个非常糟糕的主意，因为精度有误。您应该使用定点算术，也就是NSDecimalNumber。