将int转换为缩短的格式化字符串 [英] Convert int to shortened, formatted string

问题描述

用户将以 int 输入美元值，我想将结果转换为缩短的格式化字符串。因此，如果用户输入1700，字符串将会说$ 1.7k。如果用户输入32600000，字符串将显示$ 32.6m。

更新

这里是我到目前为止的代码。它似乎工作在数字〜10k。我只是添加更多if语句为更大的数字。但是是否有更有效的方法来做到这一点？

  NSNumberFormatter * nformat = [[NSNumberFormatter alloc] init]; 
 [nformat setFormatterBehavior：NSNumberFormatterBehavior10_4]; 
 [nformat setCurrencySymbol：@$]; 
 [nformat setNumberStyle：NSNumberFormatterCurrencyStyle]; 
 double doubleValue = 10200; 
 NSString * stringValue = nil; 
 NSArray * abbrevations = [NSArray arrayWithObjects：@k，@m，@b，@t，nil]; 
 
（缩写中的NSString * s）
 {
 
 doubleValue / = 1000.0; 
 
 if（doubleValue< 1000.0）
 {
 
 if（（long long）doubleValue％（long long）100 == 0）{
 [nformat setMaximumFractionDigits：0]; 
} else {
 [nformat setMaximumFractionDigits：2]; 
} 
 
 stringValue = [NSString stringWithFormat：@％@，[nformat stringFromNumber：[NSNumber numberWithDouble：doubleValue]]] 
 NSUInteger stringLen = [stringValue length]; 
 
 if（[stringValue hasSuffix：@。00]）
 {
 //删除后缀
 stringValue = [stringValue substringWithRange：NSMakeRange（0，stringLen- 3）]; 
} else if（[stringValue hasSuffix：@。0]）{
 
 //删除后缀
 stringValue = [stringValue substringWithRange：NSMakeRange（0，stringLen- ]; 
 
} else if（[stringValue hasSuffix：@0]）{
 
 //删除后缀
 stringValue = [stringValue substringWithRange：NSMakeRange（0，stringLen -1）]; 
} 
 
 
 //在其末尾添加字母后缀
 stringValue = [stringValue stringByAppendingString：s]; 
 
 // stringValue = [NSString stringWithFormat：@％@％@，[nformat stringFromNumber：[NSNumber numberWithDouble：doubleValue]]，s]; 
 break; 
} 
} 
 
 NSLog（@Cash =％@，stringValue）; 
  

解决方案

长值= 1700llu; 
 // value = 32600001llu; 
 // value = UINT64_MAX; 
 
 NSUInteger index = 0; 
 double dvalue =（double）value; 
 //更新为使用正确的SI符号（http://en.wikipedia.org/wiki/SI_prefix）
 NSArray * suffix = @ [@，@k，@M ，G，T，P，E]; 
 
 while（（value / = 1000）&& ++ index）dvalue / = 1000; 
 
 NSString * svalue = [NSString stringWithFormat：@$％。* f％@，
 //使用boolean作为0或1作为精度
（int） < 100.0&&（（unsigned）（（dvalue-（unsigned）dvalue）* 10）> 0）），
 dvalue，[suffix objectAtIndex：index] 
 NSLog（@Value：％@，svalue）; 
  
 
 
 
 
 
 
  ARC本地化版本 
  unsigned long long value = 1700llu; 
 // value = 32600001llu; 
 // value = UINT64_MAX; 
 
 NSUInteger index = 0; 
 double dvalue =（double）value; 
 //更新为使用正确的SI符号（http://en.wikipedia.org/wiki/SI_prefix）
 NSArray * suffix = @ [@，@k，@M ，G，T，P，E]; 
 
 while（（value / = 1000）&& ++ index）dvalue / = 1000; 
 
 NSNumberFormatter * formatter = [[NSNumberFormatter alloc] init]; 
 //德国示例
 [formatter setLocale：[[NSLocale alloc] initWithLocaleIdentifier：@de-de]]; 
 //将小数位设置为0或1 
 [formatter setMaximumFractionDigits：（int）（dvalue< 100.0&&（（unsigned）（（dvalue  - （unsigned）dvalue）* 10）> ; 0））]; 
 
 NSString * svalue = [[formatter stringFromNumber：[NSNumber numberWithFloat：dvalue]] 
 stringByAppendingString：[suffix objectAtIndex：index]]; 
 
 NSLog（@Value：％@，svalue）; 
  
 
The user will enter a dollar value as an int, and I'd like to convert the result into a shortened, formatted string. So if the user enters 1700, the string would say "$1.7k". If the user enters 32600000, the string would say "$32.6m". 

Update

Here's the code I have so far. It seems to be working for numbers ~10k. I would just add more if statements for bigger numbers. But is there a more efficient way to do this?
NSNumberFormatter *nformat = [[NSNumberFormatter alloc] init]; 
[nformat setFormatterBehavior:NSNumberFormatterBehavior10_4]; 
[nformat setCurrencySymbol:@"$"]; 
[nformat setNumberStyle:NSNumberFormatterCurrencyStyle]; 
double doubleValue = 10200; 
NSString *stringValue = nil; 
NSArray *abbrevations = [NSArray arrayWithObjects:@"k", @"m", @"b", @"t", nil] ; 

for (NSString *s in abbrevations) 
{ 

    doubleValue /= 1000.0 ; 

    if ( doubleValue < 1000.0 ) 
    { 

        if ( (long long)doubleValue % (long long) 100 == 0 ) { 
            [nformat setMaximumFractionDigits:0]; 
        } else {                 
            [nformat setMaximumFractionDigits:2]; 
        } 

        stringValue = [NSString stringWithFormat: @"%@", [nformat stringFromNumber: [NSNumber numberWithDouble: doubleValue]] ]; 
        NSUInteger stringLen = [stringValue length]; 

        if ( [stringValue hasSuffix:@".00"] ) 
        {                
            // Remove suffix 
            stringValue = [stringValue substringWithRange: NSMakeRange(0, stringLen-3)];             
        } else if ( [stringValue hasSuffix:@".0"] ) { 

            // Remove suffix 
            stringValue = [stringValue substringWithRange: NSMakeRange(0, stringLen-2)]; 

        } else if ( [stringValue hasSuffix:@"0"] ) { 

            // Remove suffix 
            stringValue = [stringValue substringWithRange: NSMakeRange(0, stringLen-1)];         
        } 


        // Add the letter suffix at the end of it 
        stringValue = [stringValue stringByAppendingString: s]; 

        //stringValue = [NSString stringWithFormat: @"%@%@", [nformat stringFromNumber: [NSNumber numberWithDouble: doubleValue]]  , s] ; 
        break ; 
    }    
}  

NSLog(@"Cash = %@", stringValue); 

解决方案
unsigned long long value = 1700llu;
//value = 32600001llu;
//value = UINT64_MAX;

NSUInteger index = 0;
double dvalue = (double)value;
//Updated to use correct SI Symbol ( http://en.wikipedia.org/wiki/SI_prefix )
NSArray *suffix = @[ @"", @"k", @"M", @"G", @"T", @"P", @"E" ];

while ((value/=1000) && ++index) dvalue /= 1000;

NSString *svalue = [NSString stringWithFormat:@"$%.*f%@",
                    //Use boolean as 0 or 1 for precision
                    (int)(dvalue < 100.0 && ((unsigned)((dvalue - (unsigned)dvalue) * 10) > 0)),
                    dvalue, [suffix objectAtIndex:index]];
NSLog(@"Value: %@", svalue);




ARC Localized Version
unsigned long long value = 1700llu;
//value = 32600001llu;
//value = UINT64_MAX;

NSUInteger index = 0;
double dvalue = (double)value;
//Updated to use correct SI Symbol ( http://en.wikipedia.org/wiki/SI_prefix )
NSArray *suffix = @[ @"", @"k", @"M", @"G", @"T", @"P", @"E" ];

while ((value/=1000) && ++index) dvalue /= 1000;

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
//Germany Example
[formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"de-de"]];
//Set fractional digits to 0 or 1
[formatter setMaximumFractionDigits:(int)(dvalue < 100.0 && ((unsigned)((dvalue - (unsigned)dvalue) * 10) > 0))];

NSString *svalue = [[formatter stringFromNumber:[NSNumber numberWithFloat:dvalue]]
                    stringByAppendingString:[suffix objectAtIndex:index]];

NSLog(@"Value: %@", svalue);


                        
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