以编程方式使 uitextview 滚动 [英] Making uitextview scroll programmatically

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....

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