为什么NSNumberFormatter不接受加号

Question

if(![myNumberFormatter numberFromString:[tempColumn objectAtIndex:j]]) 
{ 
    numericalColumns[j] = NO; 
    if(j == 8) 
    { 
     NSLog(@" non numerical value in column 8 i = %d object = %@ ", i , [tempColumn   objectAtIndex:j]); 
    } 
} 

我发现了什么：

0 good 
-19.49883745 good 
+38.85928608 bad 
+46.94000154 bad 
-0.36042119  good 
+38.30408636 bad 
-44.29029741 good 
+26.91823821 bad 
-79.06183133 good 
-16.69693020 good 

Answer 1

试着这样做：

[myNumberFormatter setPositivePrefix:@"+"]; 

调用numberForString

前