SAN FRANCISCO  The iPhone 4 antenna may be causing static for some Apple investors, but the company is showing no signs of slowing down.

Apple said on Tuesday that its net income rose 78 percent last quarter, driven by strong sales of the iPhone, the iPad and the Macintosh line of computers.

The results show that Apple is continuing to outpace its competitors in its three major lines of business: computers, phones and tablets. And Apple would be selling even more iPhones and iPads if it could keep up with demand.

“More and more, people’s lives are dependent on desktop and mobile computing,” said Gene Munster, an analyst with Piper Jaffray. “People realize that and are willing to pay up for it, and Apple is capitalizing on that.”