IOS scrollview is not clickable - ios

Question

Here is my code:
int i = 0;
self.userInteractionEnabled = YES;
self.exclusiveTouch = YES;
self.canCancelContentTouches = YES;
self.delaysContentTouches = YES;
self.translatesAutoresizingMaskIntoConstraints = YES;
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(gototest)];
tapGestureRecognizer.numberOfTapsRequired = 1;
[self addGestureRecognizer:tapGestureRecognizer];
for (NSString *message in self.messages) {
UILabel * label = [[UILabel alloc] initWithFrame:CGRectZero];
self.userInteractionEnabled = YES;
label.text = message;
label.tag = i;
CGSize size = [message sizeWithFont:label.font];
CGFloat width = size.width + kPADDING;
label.frame = CGRectMake(xPos, 0.0, width, self.frame.size.height);
[self addSubview:label];
i++;
xPos += width;
NSLog(#"%#",NSStringFromCGRect(label.frame));
}
self.messagesWidth = xPos;
self.contentSize = CGSizeMake(xPos, self.frame.size.height);
self.contentOffset = CGPointMake(-self.frame.size.width, 0.0);
}
-(void)gototest
{
NSLog(#"test %#",#"ccc ");
}
and then for marquee
- (void)go {
if (!self.period) self.period = self.messagesWidth / 100;
// so it always takes about the same (fudged, but reasonable) amount of time to scroll the whole array
[UIView animateWithDuration:self.period
delay:0.0
options:UIViewAnimationOptionCurveLinear |UIViewAnimationOptionRepeat
animations:^{
self.contentOffset = CGPointMake(self.messagesWidth, 0.0);
} completion:^(BOOL finished){}];
}
So, my goal is to create a marquee for news and each news be clickable to see the details of the clicked new.
but the UITapGestureRecognizer doesnt work and I dont know why.
Note that self is scrollview because my class extend from UIScrollView.
So please help me

Answer 1

You have to subclass UIScrollView in the following way. Then use your custom scroll view (i.e. TouchScrollView) instead of the regular UIScrollView
TouchScrollView.h:
#import <Foundation/Foundation.h>
#import UIKit;
#interface TouchScrollView : UIScrollView
#end
TouchScrollView.m:
#import "TouchScrollView.h"
#implementation TouchScrollView
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
// Respond to touch events here
// ...
[self.nextResponder touchesBegan:touches withEvent:event];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
[self.nextResponder touchesMoved:touches withEvent:event];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[self.nextResponder touchesEnded:touches withEvent:event];
}
#end
Or if you want to do it in Swift since it's the fashion nowadays:
TouchScrollView.swift
import Foundation
import UIKit
class TouchScrollView: UIScrollView {
override func touchesBegan(touches: NSSet!, withEvent event: UIEvent!) {
// Respond to touch events here
// ...
nextResponder().touchesBegan(touches, withEvent: event)
}
override func touchesMoved(touches: NSSet!, withEvent event: UIEvent!) {
nextResponder().touchesMoved(touches, withEvent: event)
}
override func touchesEnded(touches: NSSet!, withEvent event: UIEvent!) {
nextResponder().touchesEnded(touches, withEvent: event)
}
}