I have made a UISlider
work just like the "slide to unlock" slider.
What I need to do is determine the point at which lifting your finger off is classed as touchUpOUTSIDE
and not touchUpINSIDE
. This is the point where you slide your finger past the end of the slider too far.
I guess it's the same as with a UIButton
, you can press the button then slide your finger off the button and depending how far you go, it can still be classed as touchUpInside
.
If possible, i'd like to mark the target area with a circle.
Once i've managed to find where this point is, is it possible to change it? So I could have a bigger target area?
I really don't know where to start with this. Thanks
It's taken me a few hours, but i've managed to sort this. I've done a lot of testing overriding touchesMoved, touchesEnded and sendAction:action:target:event and it seems that any touch within 70px of the frame classes as a touch INSIDE. So for a UISlider that's 292x52 any touch from x:-70 to x:362 or y:-70 to 122 will count as an inside touch, even though it's outside the frame.
I have come up with this code that will override a custom class to allow a bigger area of 100px around the frame to count as an inside touch:
#import "UICustomSlider.h"
@implementation UICustomSlider {
BOOL callTouchInside;
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
callTouchInside = NO;
[super touchesMoved:touches withEvent:event];
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint touchLocation = [[touches anyObject] locationInView:self];
if (touchLocation.x > -100 && touchLocation.x < self.bounds.size.width +100 && touchLocation.y > -100 && touchLocation.y < self.bounds.size.height +100) callTouchInside = YES;
[super touchesEnded:touches withEvent:event];
}
-(void)sendAction:(SEL)action to:(id)target forEvent:(UIEvent *)event
{
if (action == @selector(sliderTouchOutside)) { // This is the selector used for UIControlEventTouchUpOutside
if (callTouchInside == YES) {
NSLog(@"Overriding an outside touch to be an inside touch");
[self sendAction:@selector(UnLockIt) to:target forEvent:event]; // This is the selector used for UIControlEventTouchUpInside
} else {
[super sendAction:action to:target forEvent:event];
}
} else {
[super sendAction:action to:target forEvent:event];
}
}
With a little bit more tweaking I should be able to use it for the opposite also. (Using a closer touch as an outside touch).