保留四位小数 记录一下
+ (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@"";
}
