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我有一个UIScrollView,我已经设置为一次刷一列(每页两列) - 通过将框架设置为视图实际宽度的一半,将clipToBounds设置为NO并使用hitTest将框架外部的区域声明为属于UIScrollView(请参见下面的示例)。
UIScrollview外部的剪辑边界外的子视图没有收到触摸
这很好,但我现在的问题是,UIScrollView的子视图没有得到任何触摸事件 - 只有主UIScrollView。
在以下示例中,如果包含hitTest
代码,那么scrollview会正确滚动,一次分页一列,并且可能会看到其所有内容 - 但内部滚动视图不会接收到触摸事件。
如果我删除hitTest
代码,那么只有第一个子滚动视图接收到触摸,并且可以看到其所有内容 - 但主滚动视图不会在非剪切区域中触及。
我该如何解决这个问题?
例子:
//=========================================
// UIScrollViewEx
// Just in order to log touches...
//=========================================
@interface UIScrollViewEx : UIScrollView {}
@end
@implementation UIScrollViewEx
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
NSLog(@"Touches Began (0x%08X)", (unsigned int)self);
}
@end
//=========================================
// UIViewEx
// Dummy class - sets subview as hit target
// just to demonstrate usage of non-clipped
// content
//=========================================
@interface UIViewEx : UIView {}
@end
@implementation UIViewEx
- (UIView *) hitTest:(CGPoint) point withEvent:(UIEvent *)event {
if ([self pointInside:point withEvent:event]) {
return [self.subviews objectAtIndex:0];
}
return nil;
}
@end
//=========================================
// MainClass
// Any UIViewEx based class which returns
// the UIScrollView child on hittest
//=========================================
@implementation MyClass
- (UIColor*) randomColor
{
int r = arc4random() % 100;
int g = arc4random() % 100;
int b = arc4random() % 100;
return [UIColor colorWithRed:(0.01 * r) green:(0.01 * g) blue:(0.01 * b) alpha:1.0];
}
- (void) loadScrollviews
{
// Set frame to half of actual width so that paging will swipe half a page only
CGRect frame = CGRectMake(0, 0, self.bounds.size.width/2, 400);
// Main scrollview
UIScrollView *scrollview = [[UIScrollView alloc] initWithFrame:frame];
[scrollview setBackgroundColor:[UIColor greenColor]];
[scrollview setPagingEnabled:YES];
[scrollview setClipsToBounds:NO];
// Create smaller scrollviews inside it - each one half a screen wide
const int numItems = 5;
for(int i = 0; i < numItems; ++i) {
frame.origin.x = frame.size.width * i;
UIScrollView *innerScrollview = [[UIScrollViewEx alloc] initWithFrame:frame];
[innerScrollview setContentSize:CGSizeMake(frame.size.width, 1000)];
[innerScrollview setBackgroundColor:[self randomColor]];
[scrollview addSubview:innerScrollview];
[innerScrollview release];
}
[scrollview setContentSize:CGSizeMake(numItems * frame.size.width, frame.size.height)];
[self addSubview:scrollview];
}
@end
更新
我获得通过执行以下操作转发到内部视图中的接触,但肯定必须有一个更好的办法?
- (UIView *) hitTest: (CGPoint) pt withEvent: (UIEvent *) event
{
if(CGRectContainsPoint(self.bounds, pt))
{
UIScrollView *scrollview = [self.subviews objectAtIndex:0];
CGPoint scrollViewpoint = [scrollview convertPoint:pt fromView:self];
for(UIView *view in scrollview.subviews) {
if(CGRectContainsPoint(view.frame, scrollViewpoint)) {
return view;
}
}
return scrollview;
}
else {
return [super hitTest:pt withEvent:event];
}
}
我看到它与此类似(http://stackoverflow.com/questions/3735218/paging-uiscrollview-with-peeking-neighbor-pages),但问题依然存在。 – 2010-12-14 10:41:11