// 선언
@interface RenderView : UIView 
{
    CADisplayLink *displayLink;
}
// 초기화 
displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(runLoop)]; 
[displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
// 루프함수
-(void)runLoop {
    NSLog(@"runLoop");
    [self setNeedsDisplay];
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