UIScrollView delaysContentTouches
@property(nonatomic) BOOL delaysContentTouches
Discussion of [UIScrollView delaysContentTouches]
If the value of this property is YES, the scroll view delays handling the touch-down gesture until it can determine if scrolling is the intent. If the value is NO , the scroll view immediately calls touchesShouldBegin:withEvent:inContentView:. The default value is YES.
See the class description for a fuller discussion.
UIScrollView delaysContentTouches example.
- (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
UIView* result = [super hitTest:point withEvent:event];
NSString *viewDescription = [result.superview class].description;
NSRange range = [viewDescription rangeOfString : @"UIPicker"];
if (range.location != NSNotFound)
{
NSLog(@"Cancel touch on ScrollView");
self.canCancelContentTouches = NO;
self.delaysContentTouches = NO;
self.scrollEnabled = NO;
}
else
{
self.canCancelContentTouches = YES;
self.delaysContentTouches = YES;
self.scrollEnabled = YES;
}
return result;
}
{
UIView* result = [super hitTest:point withEvent:event];
NSString *viewDescription = [result.superview class].description;
NSRange range = [viewDescription rangeOfString : @"UIPicker"];
if (range.location != NSNotFound)
{
NSLog(@"Cancel touch on ScrollView");
self.canCancelContentTouches = NO;
self.delaysContentTouches = NO;
self.scrollEnabled = NO;
}
else
{
self.canCancelContentTouches = YES;
self.delaysContentTouches = YES;
self.scrollEnabled = YES;
}
return result;
}
Example of [UIScrollView delaysContentTouches].
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
//...
[cell.xButton addTarget:self action:@selector(xButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
self.delaysContentTouches = YES;
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapFrom:)];
[self addGestureRecognizer:tapGestureRecognizer];
tapGestureRecognizer.delegate = self;
}
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
UIView* touchedView = [touch view];
if([touchedView isKindOfClass:[UIButton class]]) {
return NO;
}
return YES;
}
{
self = [super initWithFrame:frame];
if (self) {
//...
[cell.xButton addTarget:self action:@selector(xButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
self.delaysContentTouches = YES;
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapFrom:)];
[self addGestureRecognizer:tapGestureRecognizer];
tapGestureRecognizer.delegate = self;
}
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
UIView* touchedView = [touch view];
if([touchedView isKindOfClass:[UIButton class]]) {
return NO;
}
return YES;
}
UIScrollView delaysContentTouches example.
//init scrolling area
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 480, 480)];
scrollView.contentSize = CGSizeMake(480, 1000);
scrollView.bounces = NO;
scrollView.delaysContentTouches = YES;
//create background image
UIImageView *rowsBackground = [[UIImageView alloc] initWithImage:[self scaleAndRotateImage:[UIImage imageNamed:@"mylongbackground.png"]]];
rowsBackground.userInteractionEnabled = YES;
//create button
UIButton *btn = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
btn.frame = CGRectMake(100, 850, 150, 150);
btn.bounds = CGRectMake(0, 0, 150.0, 150.0);
[btn setImage:[self scaleAndRotateImage:[UIImage imageNamed:@"basicbutton.png"]] forState:UIControlStateNormal];
[btn addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
//add "stuff" to scrolling area
[scrollView addSubview:rowsBackground];
[scrollView addSubview:btn];
//add scrolling area to cocos2d
//this is just a UIWindow
[[[Director sharedDirector] openGLView] addSubview:scrollView];
//mem-mgmt
[rowsBackground release];
[btn release];
[scrollView release];
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 480, 480)];
scrollView.contentSize = CGSizeMake(480, 1000);
scrollView.bounces = NO;
scrollView.delaysContentTouches = YES;
//create background image
UIImageView *rowsBackground = [[UIImageView alloc] initWithImage:[self scaleAndRotateImage:[UIImage imageNamed:@"mylongbackground.png"]]];
rowsBackground.userInteractionEnabled = YES;
//create button
UIButton *btn = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
btn.frame = CGRectMake(100, 850, 150, 150);
btn.bounds = CGRectMake(0, 0, 150.0, 150.0);
[btn setImage:[self scaleAndRotateImage:[UIImage imageNamed:@"basicbutton.png"]] forState:UIControlStateNormal];
[btn addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
//add "stuff" to scrolling area
[scrollView addSubview:rowsBackground];
[scrollView addSubview:btn];
//add scrolling area to cocos2d
//this is just a UIWindow
[[[Director sharedDirector] openGLView] addSubview:scrollView];
//mem-mgmt
[rowsBackground release];
[btn release];
[scrollView release];