iOS - Delayed "Touch Down" event for UIButton in UITableViewCell
i solve this problem in my code by subclassing UIButton,
Objective C
@interface TBButton : UIButton
@end
@implementation TBButton
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
self.highlighted = true;
[super touchesBegan:touches withEvent:event];
}
- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
self.highlighted = false;
[super touchesEnded:touches withEvent:event];
}
- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
self.highlighted = false;
[super touchesCancelled:touches withEvent:event];
}
@end
swift
class TBButton: UIButton {
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
highlighted = true
super.touchesBegan(touches, withEvent: event)
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
highlighted = false
super.touchesEnded(touches, withEvent: event)
}
override func touchesCancelled(touches: Set<UITouch>?, withEvent event: UIEvent?) {
highlighted = false
super.touchesCancelled(touches, withEvent: event)
}
}
swift 3
class TBButton: UIButton {
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
isHighlighted = true
super.touchesBegan(touches, with: event)
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
isHighlighted = false
super.touchesEnded(touches, with: event)
}
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
isHighlighted = false
super.touchesCancelled(touches, with: event)
}
}
This is caused by the UIScrollView
property delaysContentTouches
.
It used to be sufficient to just set that property to NO
for the UITableView
itself, but that will only work for subviews of the table that are not encased in another UIScrollView
.
UITableViewCells
contain an internal scroll view in iOS 7 so you will need to change the value of this property on the cell level for all cells with buttons in them.
Here is what you need to do:
1.in viewDidLoad
or somewhere similar once your UITableView
has been initialized, put this in:
self.tableView.delaysContentTouches = NO;
2.for iOS 7 support, in the initialization method for your UITableViewCell
(initWithStyle:reuseIdentifier:
or initWithCoder:
for NIBs), put this in at the end:
for (UIView *currentView in self.subviews)
{
if([currentView isKindOfClass:[UIScrollView class]])
{
((UIScrollView *)currentView).delaysContentTouches = NO;
break;
}
}
This is unfortunately not a 100% permanent solution as Apple can change the view hierarchy inside cells again in the future (perhaps moving the scroll view another layer down or something which would require you to nest another loop in there), but until they surface the class or at least the property to developers somehow, this is the best we've got.
Swift:
Firstly, turn off delays in UITableView
after it is loaded successfully, for example, inside viewDidLoad()
method:
someTableView.delaysContentTouches = false
Then turn off delays in the scroll views contained inside the UITableView
:
for case let scrollView as UIScrollView in someTableView.subviews {
scrollView.delaysContentTouches = false
}
Note for iOS7: You might have to disable the delays in UITableViewCell
. (Check Dima's answer). You might also find some other tips here.