iOS 保留小数点两位 不四舍五入

    NSNumber *number = @(1.9999);
    NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
    [formatter setPositiveFormat:@"###0.00"];
    formatter.roundingMode = NSNumberFormatterRoundDown;
    formatter.maximumFractionDigits = 2;
    NSLog(@"%@", [formatter stringFromNumber:number]); 
``