是否可以让 UITextView 自动滚动文本，并在 Xcode 中重复？

Question

是否可以让 UITextView 自动重复滚动文本？比如，我有一个 UITextView，文本只是滚动，然后滚动，当它到达末尾时，一遍又一遍地重复自己，而不需要用户滚动？

Answer 1

 - (void)viewDidLoad
        {    
          h=0;   // add the variable int h to your interface
            myTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 
                                                           target:self 
                                                          selector:@selector(scrollPosition) 
                                                           userInfo:nil 
                                                           repeats:YES]; 
        }

- (void) scrollPosition {
                   h += 50; // add the variable int h to your interface
                //you must add the textview delegate to file's owner
                 [self.textview setContentOffset:CGPointMake(0, h) animated:YES];  

                   }

-(void)scrollViewDidScroll: (UIScrollView*)scrollView
                        {
                 float scrollViewHeight = scrollView.frame.size.height;
                 float scrollContentSizeHeight = scrollView.contentSize.height;
                 float scrollOffset = scrollView.contentOffset.y;
                    //  at the end of scrollview
                if (scrollOffset + scrollViewHeight >= scrollContentSizeHeight)
                            {
                //you must add the textview delegate to file's owner
                [self.textview setContentOffset:CGPointMake(0, 0) animated:YES]; 
                [myTimer invalidate];
                myTimer = nil;
                h=0;
                myTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 
                                                               target:self 
                                                              selector:@selector(scrollPosition) 
                                                               userInfo:nil 
                                                               repeats:YES]; 
                            }
                        }