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The static keyword in the OC syntax cannot be decorated with attributes, nor can it be decorated with methods, only local variables in the method. Static modifies a local variable and then changes the local variable to a static variable. This variable is not recycled when the method is executed. This variable is still in place the next time you execute this method.Self is a pointer, and in the object method, self points to the current object. Therefore, you can use self to explicitly access the
Often see a friend asked how to make "Pixel brush light" (hey, I do not know whether the word is accurate), that is, do the pendant often do the kind of light point flow effect. Although I have seen a lot of related tutorials, but, personal feeling tutorials are a bit complicated and tedious; for example, if the pixel pattern is irregular, you have to do a dot of the same size, and then according to the direction of the pixel, by moving the dots one b
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