UITextView scrollEnabled = YES not working after set scrollEnabled = NO in iOS8 - ios

Question

I create a demo for checking UITextView scrollEnabled.
It only contains 1 UITextView and 2 button enable and disable scroll
I test on simulator and device iOS 8, if I click the disable scroll button, the UITextView will disable scroll correctly, but after that I
click on enable scroll, the UITextView won't enable scroll
However, I test on device iOS9, the enable and disable scroll work well.
#import "ViewController.h"
#interface ViewController ()
#property (weak, nonatomic) IBOutlet UITextView *myTextView;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (IBAction)enableScrollButtonPressed:(id)sender{
self.myTextView.scrollEnabled = YES;
}
- (IBAction)disableScrollButtonPressed:(id)sender{
self.myTextView.scrollEnabled = NO;
}
#end
Any idea to fix this problem? If someone don't understand my explain please check
my demo project
Any help or suggestion would be great appreciated

Answer 1

The problem is that in iOS 8, contentSize is not adjusted correctly when scrollEnabled is changed. A small adjustment to your enableScrollButtonPressed method will successfully work around the problem.
-(IBAction)enableScrollButtonPressed:(id)sender
{
self.myTextView.scrollEnabled = YES;
self.myTextView.contentSize = [self.myTextView sizeThatFits:self.myTextView.frame.size];
}

Answer 2

Yeah you are right disabling and enabling scroll of textview is not working in iOS8 it may be a bug or anything else, let it be.
We can disable or enable scroll of text view by just changing the ContentSize of textview .
#import "ViewController.h"
#interface ViewController ()
#property (weak, nonatomic) IBOutlet UITextView *myTextView;
#end
#implementation ViewController
-(IBAction)enableScrollButtonPressed:(id)sender{
CGSize scrollableSize = CGSizeMake(self.myTextView.bounds.size.width+20, self.myTextView.bounds.size.height+20);
[self.myTextView setContentSize:scrollableSize];
}
-(IBAction)disableScrollButtonPressed:(id)sender{
[self.myTextView setContentOffset:CGPointMake(0, 0)];
[self performSelector:#selector(StopScroll) withObject:nil afterDelay:0.1];
}
-(void)StopScroll{
CGSize scrollableSize = CGSizeMake(self.myTextView.bounds.size.width, self.myTextView.bounds.size.height/2);
[self.myTextView setContentSize:scrollableSize];
}
#end
I had tested the above code it is working fine for me i'am using xcode 7.2.1 and iOS 8.3. Give it a try and let me know the result

Answer 3

After searching hours i am found one way
-(IBAction)enableScrollButtonPressed:(id)sender{
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
self.myTextView.scrollEnabled = YES;
[self.myTextView setText:self.myTextView.text];
self.myTextView.layoutManager.allowsNonContiguousLayout = false;
});
}
-(IBAction)disableScrollButtonPressed:(id)sender{
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
self.myTextView.scrollEnabled = NO;
});
}
condition for that is you need to scroll first then you it will work perfectly
Means when disable scroll button is tapped textview should be scrolled at some position must not to at default position

Answer 4

Please follow below steps simply
self.myTextView.scrollEnabled = NO;
self.myTextView.userInteractionEnabled = YES;
self.myTextView.scrollEnabled = YES;

Answer 5

you need to layout your views after enabling or disabling scroll view in your view.
use viewWillLayoutSubviews/layoutIfNeeded methods.

Answer 6

change your property as follows.
in your code..
#property (weak, nonatomic) IBOutlet UITextView *myTextView;
change property attribute as follows:
#property (strong, nonatomic) IBOutlet UITextView *myTextView;
then it'll work fine. i checked it.

Answer 7

I tried my code and it worked properly
IBOutlet UITextView *tv;
//---------Enable button action.
-(IBAction)enable:(id)sender
{
tv.scrollEnabled=YES;
}
//---------Disable button action.
-(IBAction)disable:(id)sender
{
tv.scrollEnabled=NO;
}
try your code once more in device.

Answer 8

Try this one
func scrollViewDidScroll(_ scrollView: UIScrollView) {
tableView.setContentOffset(CGPoint.zero, animated: false)
}