代理：

• - (void)passwordInputView:(SLPasswordInputView *)inputView willBeginInputWithPassword:(NSString *)password;
• - (void)passwordInputView:(SLPasswordInputView *)inputView willEndInputWithPassword:(NSString *)password;
• - (void)passwordInputView:(SLPasswordInputView *)inputView didChangeInputWithPassword:(NSString *)password;
• -(void)passwordInputView:(SLPasswordInputView *)inputView didFinishInputWithPassword:(NSString *)password;

属性

• 密码长度
• @property (assign, nonatomic) NSUInteger passwordLength;
• 密码字符大小
• @property (assign, nonatomic) CGFloat passwordWidth;
• 密码字符颜色（只在使用默认密码字符图片时有效
• @property (strong, nonatomic) UIColor *passwordColor;
• 密码字符图片（正方形图片，默认为黑色圆点）
• @property (strong, nonatomic) UIImage *passwordImage;
• 显示边框
• @property (assign, nonatomic) BOOL showBorder;
• 边框圆角大小
• @property (assign, nonatomic) CGFloat borderCornerRadius;
• 边框线宽
• @property (assign, nonatomic) CGFloat borderWidth;
• 边框颜色
• @property (strong, nonatomic) UIColor *borderColor;
• 键盘类型
• @property (assign, nonatomic) UIKeyboardType keyboardType;
• 返回按钮类型
• @property (assign, nonatomic) UIReturnKeyType returnKeyType;
• 密码文本
• @property (copy, nonatomic, nullable) NSString *passwordText;
• 内边距
• @property (assign, nonatomic) UIEdgeInsets contentInsets;