+ (void)showHudTipStr:(NSString *)tipStr;+ (void)showHudTipStr:(NSString *)tipStr{    if (tipStr && tipStr.length > 0) {        MBProgressHUD *hud = [self showHUDAddedTo:[UIApplication sharedApplication].keyWindow animated:YES];        hud.mode = MBProgressHUDModeText;        hud.detailsLabelFont = [UIFont boldSystemFontOfSize:15.0];        hud.detailsLabelText = tipStr;        hud.margin = 10.f;        hud.removeFromSuperViewOnHide = YES;        [hud hide:YES afterDelay:1.0];    }}

调用

[self.user updateInBackgroundWithResultBlock:^(BOOL isSuccessful, NSError *error) {                                NSString *tip = isSuccessful?@"设置成功":error.userInfo[@"error"];                [MBProgressHUD showHudTipStr:tip];            }];