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Rick Fan's List: apple development
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touchstarttouchendtouchmovetouchcancel(when the system cancels the touch)
you use your iPhone with a finger instead of a mouse; rather than clicking, you tap. What’s more, you can use several fingers to touch and tap. On the iPhone, mouse events are replaced by touch events. They are:
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The UIKit classes are generally not thread safe. All work related to your application’s user interface should be performed on your application’s main thread.
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The sandbox limits the damage an attacker can cause to other applications and to the system, but it cannot prevent attacks from happening. In other words, the sandbox does not protect your application from direct attacks by malicious entities. For example, if there is an exploitable buffer overflow in your input-handling code and you fail to validate user input, an attacker might still be able to crash your program or use it to execute the attacker’s code.
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