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      1. 以编程方式使 uitextview 滚动

        Making uitextview scroll programmatically(以编程方式使 uitextview 滚动)

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                • 本文介绍了以编程方式使 uitextview 滚动的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我想让我的 uitextview 在应用程序启动时自动滚动.谁能帮我详细的代码?我是 iPhone SDK 的新手.

                  I want to make my uitextview to scroll automatically whenever the application is launched. Can anyone help me with a detailed code? I am new to iPhone SDK.

                  推荐答案

                  .h文件

                  @interface Credits : UIViewController 
                  {
                      NSTimer *scrollingTimer;
                  
                      IBOutlet UITextView *textView;
                  
                  
                  }
                  @property (nonatomic , retain) IBOutlet UITextView *textView;
                  
                  - (IBAction) buttonClicked ;
                  
                  - (void) autoscrollTimerFired;
                  
                  @end
                  

                  .m 文件

                  - (void) viewDidLoad
                  {       
                      // it prints the initial position of text view 
                      NSLog(@"%f %f",textView.contentSize.width , textView.contentSize.height);
                  
                      if (scrollingTimer == nil)
                      {
                          // A timer that updates the content off set after some time so it can scroll 
                          // you can change time interval according to your need (0.06)
                          // autoscrollTimerFired is the method that will be called after specified time interval. This method will change the content off set of text view
                          scrollingTimer = [NSTimer scheduledTimerWithTimeInterval:(0.06)
                                           target:self selector:@selector(autoscrollTimerFired) userInfo:nil repeats:YES];        
                      }
                  }
                  
                  - (void) autoscrollTimerFired
                  {
                      CGPoint scrollPoint = self.textView.contentOffset; // initial and after update
                      NSLog(@"%.2f %.2f",scrollPoint.x,scrollPoint.y);
                      if (scrollPoint.y == 583) // to stop at specific position 
                      {
                          [scrollingTimer invalidate];
                          scrollingTimer = nil;
                      }
                      scrollPoint = CGPointMake(scrollPoint.x, scrollPoint.y + 1); // makes scroll
                      [self.textView setContentOffset:scrollPoint animated:NO];
                      NSLog(@"%f %f",textView.contentSize.width , textView.contentSize.height);
                  
                  }
                  

                  希望对你有帮助....

                  Hope it helps you....

                  这篇关于以编程方式使 uitextview 滚动的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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