decimalNumberByMultiplyingBy:withBehavior:

INDEX>Foundation>NSDecimalNumber

十進数オブジェクトを乗算した結果を返します

Objective-C

- (NSDecimalNumber *)decimalNumberByMultiplyingBy:(NSDecimalNumber *)decimalNumber
                                     withBehavior:(id<NSDecimalNumberBehaviors>)behavior

Swift

func decimalNumberByMultiplyingBy(_ decimalNumber: NSDecimalNumber,
                     withBehavior behavior: NSDecimalNumberBehaviors?) -> NSDecimalNumber

解説

十進数オブジェクトを乗算した結果を返します。
計算誤差の丸め（四捨五入・切り上げ・切り捨て）はbehaviorを使います。

返り値

Objective-C

( NSDecimalNumber * )

Swift

NSDecimalNumber

十進数オブジェクト

引数

Objective-C

( NSDecimalNumber * )decimalNumber

Swift

_ decimalNumber: NSDecimalNumber

十進数オブジェクト

Objective-C

( id <NSDecimalNumberBehaviors> )behavior

Swift

,withBehavior behavior: NSDecimalNumberBehaviors?

丸め方法

フレームワーク

Foundation

クラス

NSDecimalNumber

使用可能

10.0

参照

例文

Objective-C

#import "MyObject.h"

@implementation MyObject

- (IBAction)myAction:(id)sender
{
NSNumberFormatter *numFormat = [[NSNumberFormatter alloc] init] ;
NSDecimalNumber *dNum1 = [[[NSDecimalNumber alloc] autorelease] initWithString:@"3000"];
NSDecimalNumber *dNum2 = [[[NSDecimalNumber alloc] autorelease] initWithString:@"200"];
NSDecimalNumber *dNum = [[NSDecimalNumber alloc] autorelease];

dNum = [dNum1 decimalNumberByMultiplyingBy:dNum2 withBehavior:[NSDecimalNumber defaultBehavior]];

[numFormat setMaximum:dNum];
[numFormat setPositiveFormat:@"#,##0.00"];
[myOutlet setFormatter:numFormat];

NSLog([NSString stringWithFormat:@"%.2f",[[numFormat maximum] doubleValue]]);
}

@end

Swift

    //NSDecimalNumber decimalNumberByMultiplyingBy:withBehavior:
    @IBAction func function017(sender: AnyObject) {
        let dNum1 : NSDecimalNumber =
        NSDecimalNumber(string: "30")
        let dNum2 : NSDecimalNumber =
        NSDecimalNumber(string: "20")
        let dNum : NSDecimalNumber = dNum1.decimalNumberByMultiplyingBy(dNum2, withBehavior: NSDecimalNumber.defaultBehavior())
        let numFormat : NSNumberFormatter = NSNumberFormatter()
        numFormat.minimum = dNum    //最小値が600
        numFormat.positiveFormat = "#,##0.00"
        textField.formatter = numFormat
        NSLog("function017")
        commentLabel.stringValue = "←最小値が30*20=600(defaultBehavior)"
    }

編集時のバージョン

OS X 10.11
Swift2.0