黑色背景、白色文字、圆角按钮

    _save_Btn.backgroundColor = UIColorFromRGB(0x333333);// [UIColor colorWithHexString:@"0x000000" alpha:1];
    _save_Btn.layer.borderColor = (__bridge CGColorRef _Nullable)(UIColorFromRGB(0x333333));// (__bridge CGColorRef _Nullable)([UIColor colorWithHexString:@"0x000000" alpha:1]); //UIColorFromRGB(0x333333);
    _save_Btn.layer.borderWidth = 1.0;
    _save_Btn.layer.cornerRadius = 5.0;
    [_save_Btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [_save_Btn setTitle:NSLocalizedString(@"do_save", nil) forState:UIControlStateNormal];