ios - 在x轴上创建连续uiimage动画

Question

我想创建像http://disqus.com/这样的背景继续使用背景，但是尝试使用这样的代码后却无法获取背景

continuesBackground =[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"pattern"]];
    continuesBackground.frame=CGRectMake(0, 56, 320, 102);
    continuesBackground.layer.zPosition=100;
    [UIView animateWithDuration:5.0
                          delay:0.0
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{
                         continuesBackground.transform = CGAffineTransformMakeTranslation(0, 200);  }
                     completion:^(BOOL finish) {
                         continuesBackground.transform = CGAffineTransformMakeTranslation(200, 0);

                     }];

怎么做？我需要nstimer吗？

Answer 1

尝试这个:

- (void)animateImageViewFromStartPosition:(CGPoint)aStartPosition toEndPosition:(CGPoint)aEndPosition; {
  CGRect oldFrame = CGRectMake(aStartPosition.x, aStartPosition.y, continuesBackground.frame.size.width, continuesBackground.frame.size.height);
  [continuesBackground setFrame:oldFrame];

  [UIView animateWithDuration:5.0f
                        delay:0.0f
                      options:UIViewAnimationOptionCurveEaseInOut
                   animations:^(void){
                     CGRect newFrame = continuesBackground.frame;
                     newFrame.origin = aEndPosition;
                     continuesBackground.frame = newFrame;
                   }
                   completion:^(BOOL finished){
                     if(finished){
                       [self animateImageViewFromStartPosition:aStartPosition toEndPosition:aEndPosition];
                     }
                      }];
}

然后在 viewDidLoad方法中调用该方法:

- (void)viewDidLoad; {
  [super viewDidLoad];
  [self animateImageViewFromStartPosition:CGPointMake(0.0f, 56.0f) toEndPosition:CGPointMake(320.0f, 56.0f)];
}

您可以轻松地将其修改为变换或任何您想要的形式，它将使动画无限期地进行下去。希望对您有所帮助!