Apple Inc. is one of the best-performing stocks on Wall Street this year; while the S&P 500 is up about 8% since Jan. 1, shares of this tech giant are up about 33%. However, gains in Apple AAPL, -0.59>#/span### have been harder to come by lately. After hitting a 52-week high of over $156 in mid-May, shares have struggled to build on the momentum of previous months. That has led to a chorus of analysts calling a top in the tech titan, and an equally vocal group of bulls defending Apple as it approaches a very important iPhone 8 launch this fall. So what’s going on with Apple stock, and can you depend on this stock going forward?via