Did you write this yourself if you just copy-pasted it from somewhere and you didn't know what it does so you came to Stack Overflow with close to zero research done? By close to zero research, I mean you didn't even read the code...
What do you think these lines do?
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideAllKeyboards)];
tapGesture.cancelsTouchesInView = NO;
[self.view addGestureRecognizer:tapGesture];
-(IBAction)hideAllKeyboards {
NSLog(@"hideAllKeyboards");
myPicker.hidden = YES;
}
It turns out, when a touch happens (on the pickerview) in iOS7, the view that catches the tap is of class UIPickerTableViewWrapperCell, while in iOS6, it's of class UIPickerTableView (if not tapping on a row) or UITableViewCellContentView (when tapping on a row). My guess is, the later two let the tap pass through as if the tap happened on their superview (in your case, self.view). <- The last sentence is just a guess, not for sure.
The way you can make sure the picker only gets hidden in case the tap happened on self.view is to set a delegate self as delegate to tapGesture, then implement the gestureRecognizer:shouldReceiveTouch method:
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if (touch.view == self.view) {
return YES;
} else {
return NO;
}
}