保留四位小數(shù) 記錄一下

+ (NSString*)decimalNumberWithDouble4:(NSString *)stringNumber{

? ? stringNumber =[NSString stringWithFormat:@"%@",stringNumber];

? ? if ([stringNumber rangeOfString:@"."].location ==NSNotFound) {

? ? ? ? NSString *string_com = [NSString stringWithFormat:@"%@.0000",stringNumber];

? ? ? ? return?string_com;

? ? }else{

? ? ? ? NSArray*arays = [stringNumber componentsSeparatedByString:@"."];

? ? ? ? NSString*s_f = [arays objectAtIndex:0];

? ? ? ? NSString*s_e = [arays objectAtIndex:1];

if(s_e.length>4) {

? ? ? ? ? ? s_e = [s_e substringWithRange:NSMakeRange(0,4)];

? ? ? ? }else?if(s_e.length==1){

? ? ? ? ? ? s_e = [NSString stringWithFormat:@"%@000",s_e];

? ? ? ? }else?if(s_e.length==2){

? ? ? ? ? ? s_e = [NSString stringWithFormat:@"%@00",s_e];

? ? ? ? }else?if(s_e.length==3){

? ? ? ? ? ? s_e = [NSString stringWithFormat:@"%@0",s_e];

? ? ? ? }

? ? ? ? NSString *string_combine = [NSString stringWithFormat:@"%@.%@",s_f,s_e];

? ? ? ? return?string_combine;

? ? }

? ? return@"";

}