將NSString轉換爲Cocoa等價貨幣的最簡單方法

Question

我有一個NSString值@「78000」。我如何以貨幣格式獲得這個數據，即$ 78,000，並保留一個NSString。

Answer 1

您需要使用數字格式器。注意：這也是你將如何顯示日期/時間等以正確的格式，爲用戶區域設置

// alloc formatter 
NSNumberFormatter *currencyStyle = [[NSNumberFormatter alloc] init]; 

// set options. 
[currencyStyle setFormatterBehavior:NSNumberFormatterBehavior10_4]; 
[currencyStyle setNumberStyle:NSNumberFormatterCurrencyStyle]; 

NSNumber *amount = [NSNumber numberWithInteger:78000]; 

// get formatted string 
NSString* formatted = [currencyStyle stringFromNumber:amount] 

[currencyStyle release]; 

Answer 2

小數/末美分可以控制如下：

[currencyStyle setMaximumFractionDigits:0]; 

這裏的文檔鏈接從apple

Answer 3

答案上面會轉換爲數字，但這裏是真正轉換的NSString貨幣格式的方法

- (NSString*) formatCurrencyWithString: (NSString *) string 
{ 
    // alloc formatter 
    NSNumberFormatter *currencyStyle = [[NSNumberFormatter alloc] init]; 

    // set options. 
    [currencyStyle setFormatterBehavior:NSNumberFormatterBehavior10_4]; 

    // reset style to no style for converting string to number. 
    [currencyStyle setNumberStyle:NSNumberFormatterNoStyle]; 

    //create number from string 
    NSNumber * balance = [currencyStyle numberFromString:string]; 

    //now set to currency format 
    [currencyStyle setNumberStyle:NSNumberFormatterCurrencyStyle]; 

    // get formatted string 
    NSString* formatted = [currencyStyle stringFromNumber:balance]; 

    //release 
    [currencyStyle release]; 

    //return formatted string 
    return formatted; 
}