= self.
scanView.frame.origin.y; CGFloat
scanImageViewW = self.
scanViewWidth.constant; CGFloat
scanImageViewH =
7 _scanImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@
"scanLine"]] _scanImageView.frame = CGRectMake(
scanImageViewX, scanImageViewY, scanImageViewW, scanImageViewH); [self.
scanView addSubview:_scanImageView]; [UIView animateWithDuration:
2.
0 delay:
0 options:UIViewAnimationOptionRepeat animations:^{ _scanImageView.frame = CGRectMake(
scanImageViewX, scanImageViewY + self.
scanViewHeight.constant, scanImageViewW, scanImageViewH); } completion:nil]}
四、具体代码