/**
 *  显示文字, 默认1.5秒后自动消失
 */
+ (void)showText:(NSString *)message;
+ (void)showText:(NSString *)message toView:(UIView *)view;
+ (void)showText:(NSString *)message toView:(UIView *)view duration:(NSTimeInterval)duration completion:(void (^)(void))completion;

/**
 *  显示成功指示器, 默认1.5秒后自动消失
 */
+ (void)showSuccess:(NSString *)message;
+ (void)showSuccess:(NSString *)message toView:(UIView *)view;
+ (void)showSuccess:(NSString *)message toView:(UIView *)view duration:(NSTimeInterval)duration completion:(void (^)(void))completion;

/**
 *  显示失败指示器, 默认1.5秒后自动消失
 */
+ (void)showError:(NSString *)message;
+ (void)showError:(NSString *)message toView:(UIView *)view;
+ (void)showError:(NSString *)message toView:(UIView *)view duration:(NSTimeInterval)duration completion:(void (^)(void))completion;

/**
 *  显示等待指示器, 消失需要调用 `+hideHUD`
 */
+ (MBProgressHUD *)showWaiting;
+ (MBProgressHUD *)showWaiting:(NSString *)message toView:(UIView *)view;

/**
 *  显示进度, 消失需要调用 `+hideHUD`
 *
 *  调用`-setProgress:`设置进度
 */
+ (MBProgressHUD *)showProgress:(NSString *)message;

/**
 *  隐藏指示器
 */
+ (void)hideHUD;
+ (void)hideHUD:(BOOL)animated;
+ (void)hideHUDForView:(UIView *)view;