问题
Good day! I have a question,I have this code for a Single Page application
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint endPosition = [touch locationInView:self.view];
if (self.imageStatus>0)
{
if (self.startPosition.x < endPosition.x)
{
// Right swipe
CATransition *transition = [CATransition animation];
transition.duration = 0.75;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
transition.type = kCATransitionPush;
transition.subtype =kCATransitionFromLeft;
transition.delegate = self;
[self.view.layer addAnimation:transition forKey:nil];
[self.view addSubview:myViewController.view];
self.imageStatus --;
if (self.imageStatus == 0)
{
self.myImage.image = [UIImage imageNamed:@"blue_back.png"];
}
else
{
self.myImage.image = [UIImage imageNamed:@"black_back.png"];
}
}
}
if (self.imageStatus<2)
{
if (self.startPosition.x > endPosition.x)
{
// Left swipe
CATransition *transition = [CATransition animation];
transition.duration = 0.75;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
transition.type = kCATransitionPush;
transition.subtype =kCATransitionFromRight;
transition.delegate = self;
[self.view.layer addAnimation:transition forKey:nil];
[self.view addSubview:myViewController.view];
self.imageStatus ++;
if (self.imageStatus == 2)
{
self.myImage.image = [UIImage imageNamed:@"red_back.png"];
}
else
{
self.myImage.image = [UIImage imageNamed:@"black_back.png"];
}
}
}
when i open the app the default background is black, when i swipe at right it shows the blue_back.png or the blue background, when i swipe back it shows the default background which is black, and when its on black again and i will swipe it left it shows the red_back.png or the red background and vise versa. now what i want is, i will add another page with yellow background next to red, so when im in the default black page, when i swipe to left two times it shows the yellow. and also the swiping function, when i swipe it it takes maybe a second to switch a page, how can i implement the "Realtime Swiping" like in the table view, but horizontal, so it changes page fast. thanks!
回答1:
Updated answer:
What you want is a paging scrollview. The trick is to add the views are the correct positions in the scrollView and set the scrollviews contentSize correctly. Example with two views:
- (void)viewDidLoad
{
[super viewDidLoad];
self.edgesForExtendedLayout = UIRectEdgeBottom;
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
scrollView.pagingEnabled = YES;
scrollView.contentSize = CGSizeMake(self.view.frame.size.width * 2, self.view.bounds.size.height);
[self.view addSubview:scrollView];
UIView *redView = [[UIView alloc] init];
redView.frame = self.view.bounds;
redView.backgroundColor = [UIColor redColor];
[scrollView addSubview:redView];
UIView *blueView = [[UIView alloc] init];
CGRect frame = self.view.bounds;
frame.origin.x = 320;
blueView.frame = frame;
blueView.backgroundColor = [UIColor blueColor];
[scrollView addSubview:blueView];
}
Old answer: I would be easier to make use of the build in gesture recognizers. Specifically UIPanGestureRecognizer.
Example: In viewDidLoad:
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(myAction:)];
[self.view addGestureRecognizer:pan];
And the action:
- (void) myAction:(UIPanGestureRecognizer*)gestureRec
{
if (gestureRec.state == UIGestureRecognizerStateEnded) {
NSLog(@"ended");
NSLog(@"%@", NSStringFromCGPoint([gestureRec velocityInView:self.view]));
}
}
The state determines when its ended as you want. And you can use the velocityInView to determine right/left and up/down movement
来源：https://stackoverflow.com/questions/20399635/ios-swiping-functions