iOS-绘制数千个符号的最佳方法

Question

What is the best way to display thousands or even more dynamic symbols (like Matrix's rain) ? I tried to do that in drawRect method by

for (NSString *symbol in self.symbols) {
        [symbol drawAtPoint:CGPointMake(posX, posY) 
             withAttributes:@{NSFontAttributeName : self.font, 
                              NSForegroundColorAttributeName : color}];
    }

But much smaller the font, so much more laggy it becomes.
eg when font pointSize is 10, then CPU percentage is 98%.

So what is the best way to show a lot of symbols and redraw them every milliseconds from performance side ?

Answer 1

对于像这样的图形密集型过程，您将需要使用OpenGL或可能使用SpriteKit 。