TEHRAN — Britain’s foreign secretary, Boris Johnson, left Tehran on Sunday without a clear public resolution on the fate of Nazanin Zaghari-Ratcliffe, the imprisoned British-Iranian dual citizen whose plight he had been accused of worsening.

But Ms. Zaghari-Ratcliffe’s husband, Richard Ratcliffe, said he was encouraged by the progress made toward her release.

“This weekend we had our first ripple of freedom,” he said in a statement on Sunday, adding that her court case scheduled for Sunday — in which she had faced 16 more years in prison — had been postponed and linking the development to Mr. Johnson’s visit.

Iran’s judiciary, which is dominated by hard-liners, denied that any trial had been planned. The head of Iran’s revolutionary courts, Mousa Ghazanfarabadi, told the semiofficial Fars news agency that “Western outlets” had been publishing “false reports” about a new trial for Ms. Zaghari-Ratcliffe.