ios4.0 uiwebview播放视频

在ios4.0以前的version，使用uiwebview播放视频只需要；

UIWebView *videoView = [[UIWebView alloc] initWithFrame:CGRectMake(0,0,0,0)];
[self addSubview:videoView];

但在ios4.0及以后，必须设置frame:

UIWebView *videoView = [[UIWebView alloc] initWithFrame:CGRectMake(1,1,1,1)];
[self addSubview:videoView];