NSScreencast Episode #47 Gesture Recognizers

Gesture Recognizers - NSScreencast

tapした場所に画像を表示させる、移動、拡大縮小、回転

• common
  • initWithTarget:self, action:@selector(onViewDoubleTap:)
  • [self.view addGestureRecognizer:tapRecognizer];
• UITapGestureRecognizer
  • tapRecognizer.numberOfTapsRequired = 2;
  • onViewDoubleTap
    • CGPoint touchCenter = [tap locationInView:self.view];
• effect
  • CGAffineTransformRotate(imageView.transform, angle);
  • animateWithDuration:0.25 animations
  • imageView.layer
    • .border
    • .shadow
    • shadowOpacity
  • CGMutablePathRef shadowPath = CGPathCreateMutable();
    • CGPathRelease(shadowPath);
• UIPanGestureRecognizer
  • onPan
    • [pan translationInView:self.view];
    • pan.view.center;
  • pan=drag?
• UIPinchGestureRecognizer
  • onPinch
    • CGFloat scale = [pinch scale];
    • [pinch setScale:1];
• UIRotationGestureRecognizer
  • onRotate
    • CGFloat angle = [rotation rotation];
    • [rotation setRotation:0];
• UISwipeGestureRecognizer
  • swipeRecognizer.direction = UISwipeGestureRecognizerDirectionDown;
• simultaneous gestures
  • don't work together
    • pinch and rotate
    • swipe down and pan down
  • shouldRecognizeSimultaneouslyWithGestureRecognizer
  • pinchRecognizer.delegate = self;
  • gestureRecognizerShouldBegin
  • if ([gestureRecognizer isKindOfClass:[UISwipeGestureRecognizer class]]) {
• simulator
  • option -> pinch
  • option + shift -> pinch and move