我想防止在我的 UIScrollview 的第 3 页上滚动并"劫持滑动"手势以触发 sth。还。通过此操作,我想进行反应式滚动。
这行不通。
- (void)scrollViewDidScroll:(UIScrollView *)sender
{
if(scrollView.contentOffset.x == self.view.frame.size.width * 2 ) {
// disable scrolling
scrollView.scrollEnabled = NO;
}
}
// hijack the next scrolling event
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
当滚动启用 = 否时不调用此委托
感谢您的帮助
EDIT EventHandler ist not call ;-(
- (void)viewDidLoad
{
[super viewDidLoad];
// Default background color
self.view.backgroundColor = [UIColor redColor];
// Create scroll view
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
scrollView.pagingEnabled = YES;
scrollView.showsHorizontalScrollIndicator = NO;
scrollView.showsVerticalScrollIndicator = NO;
scrollView.scrollsToTop = NO;
scrollView.delegate = self;
UISwipeGestureRecognizer *recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
recognizer.direction = UISwipeGestureRecognizerDirectionLeft;
[scrollView addGestureRecognizer:recognizer];
[recognizer release];
[scrollView delaysContentTouches];
// Create subviews (pages)
NSInteger numberOfViews = 4;
for (int i = 0; i < numberOfViews; i++) {
// x pos
CGFloat yOrigin = i * self.view.frame.size.width;
// Create subview and add to scrollView
UIView *pageView = [[UIView alloc] initWithFrame:CGRectMake(yOrigin, 0, self.view.frame.size.width, self.view.frame.size.height)];
pageView.backgroundColor = [UIColor colorWithRed:0.5/i green:0.5 blue:0.5 alpha:1];
[scrollView addSubview:pageView];
[pageView release];
}
// Set contentsize
scrollView.contentSize = CGSizeMake(self.view.frame.size.width * numberOfViews, self.view.frame.size.height);
// Add scrollView to view and release
[self.view addSubview:scrollView];
[scrollView release];
}
-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
NSLog(@"swipe!!!!");
scrollView.scrollEnabled = YES;
}
如果禁用滚动视图:
scrollView.scrollEnabled = NO;
不可避免地不会调用 Delegate 方法,因此您需要一种替代方法来处理在劫持模式下的滑动。您可以尝试的一件事是使用 UISwipeGestureRecognizer
:而不是简单地禁用滚动,您可以将UISwipeGestureRecognizer
关联到您查看和处理从处理程序方法滑动:
UISwipeGestureRecognizer *recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
recognizer.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:recognizer];
在handleSwipeFrom
中,您将重新启用滚动:
-(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
// do your hijack here
scrollView.scrollEnabled = YES;
}