I think edge gestures should be used more often. This class makes it easier.
Edge gestures are when a tap slides in from the edge of the view (probably from the edge of the screen). It can be seen in Chrome to switch tabs and in YouTube to open the sidebar.
Build and run the LMEdgeGesturesExample project in Xcode to see LMEdgeGestures in action.
- (void)viewDidLoad
{
[super viewDidLoad];
LMEdgePanGestureRecognizer *leftEdgePan = [[LMEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(handleMainViewLeftEdgePan:)];
[leftEdgePan setEdge:LMEdgePanGestureRecognizerEdgeLeft];
[leftEdgePan setTouchMargin:20.];
[leftEdgePan setDelegate:self];
[self.view addGestureRecognizer:leftEdgePan];
self.leftEdgePanRecognizer = leftEdgePan;
}
- (void)handleMainViewLeftEdgePan:(LMEdgePanGestureRecognizer *)recognizer
{
static CGAffineTransform initialTransform;
if (recognizer.state == UIGestureRecognizerStateBegan) {
initialTransform = self.mainView.transform;
[self renderBackView];
} else if (recognizer.state == UIGestureRecognizerStateChanged) {
CGPoint initialTranslation = CGPointMake(initialTransform.tx, initialTransform.ty);
CGPoint translation = [recognizer translationInView:recognizer.view];
CGPoint targetTranslation = CGPointMake(translation.x+initialTranslation.x, translation.y+initialTranslation.y);
CGFloat x = MIN(MAX(0, targetTranslation.x), CGRectGetWidth(recognizer.view.frame)-5);
CGAffineTransform transform = CGAffineTransformMakeTranslation(x, 0);
self.mainView.transform = transform;
} else if (recognizer.state == UIGestureRecognizerStateEnded) {
[UIView animateWithDuration:0.2
delay:0.0
options:UIViewAnimationOptionBeginFromCurrentState
animations:^{
self.mainView.transform = CGAffineTransformIdentity;
}
completion:^(BOOL finished) {
self.leftEdgePanRecognizer.touchMargin = self.mainView.transform.tx + kLeftPanTouchMargin;
}];
}
}Logan Moseley
LMEdgeGestureRecognizer is available under the MIT license. See the LICENSE file for more info.