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No, it's not true that charging an iPhone overnight can harm the battery. In fact, Apple has a feature called "Optimized Battery Charging" that is designed to prolong the overall lifespan of your iPhone's battery.

When you charge your iPhone overnight, the battery doesn't actually reach 100% capacity. The charging process stops automatically when the battery reaches around 80% to 85% capacity. This is because charging a lithium-ion battery, like the one in an iPhone, to 100% capacity every time can cause the battery to degrade more quickly over time.

The "Optimized Battery Charging" feature, which is turned on by default, ensures that your iPhone's battery is charged to a level that maximizes performance and longevity. When you unplug your iPhone, the battery will continue to charge until it reaches the recommended maximum level, which is typically around 80% to 85%.

So, charging your iPhone overnight is not only safe but also helps to prolong the lifespan of your iPhone's battery.