How to create various buttons which get called on simple touch - iphone

Question

I have to make an app in which there are around 20 buttons, if I switch from one button to another button without removing the touch(i.e. by dragging the touch) I want to call the function when I entered in that button's frame region.
For example:when I drag touch from button's tag 10 to button's tag 11 then it should call button's tag 11 selector method.

Answer 1

I think you can not do it with UIButtons. But i have one suggestion for this may be it help you. Add Images instead of Buttons set those userIntractionEnable:NO then in touchesMoved method you can get call your #selector methods by comparing with X,Y co-ordinates.
I wrote a small code for this -
//I added your example image on my self.view with a view
//of 320x140 and set it userIntractionEnabled:NO
//Now in touchMoved: method did this..
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
CGPoint pt = [touch locationInView:self.view];
//checking the touch is in self.view or not
if([touch view] == self.view)
{
//This is like a 2D array, So you have to follow row and column pattern.
if((pt.y>=0.0 && pt.y<=70.0))//For First Row
{
//These 7 are FirstRow Columns
if(pt.x>=0.0 && pt.x<=45.0){
NSLog(#"Method - 10");
}
if(pt.x>=46.0 && pt.x<=90.0){
NSLog(#"Method - 11");
}
if(pt.x>=91.0 && pt.x<=135.0){
NSLog(#"Method - 12");
}
if(pt.x>=136.0 && pt.x<=180.0){
NSLog(#"Method - 13");
}
if(pt.x>=181.0 && pt.x<=225.0){
NSLog(#"Method - 14");
}
if(pt.x>=226.0 && pt.x<=270.0){
NSLog(#"Method - 15");
}
if(pt.x>=271.0 && pt.x<=315.0){
NSLog(#"Method - 16");
}
}
//Row change this is for Second Row
if((pt.y>=71.0 && pt.y<=140.0))
{
//These 7 are SecondRow Columns
if(pt.x>=0.0 && pt.x<=45.0){
NSLog(#"Method - 17");
}
if(pt.x>=46.0 && pt.x<=90.0){
NSLog(#"Method - 18");
}
if(pt.x>=91.0 && pt.x<=135.0){
NSLog(#"Method - 19");
}
if(pt.x>=136.0 && pt.x<=180.0){
NSLog(#"Method - 20");
}
if(pt.x>=181.0 && pt.x<=225.0){
NSLog(#"Method - 21");
}
if(pt.x>=226.0 && pt.x<=270.0){
NSLog(#"Method - 22");
}
if(pt.x>=271.0 && pt.x<=315.0){
NSLog(#"Method - 23");
}
}
}
}
Hope this will help you !!!! :-)

Answer 2

You should register event with below way.
[button addTarget:self action:#selector(aMethod:) forControlEvents:UIControlEventTouchDragEnter];