图片自动切换

    UIImage *img1=[UIImageimageNamed:@"1.JPG"];

   UIImage *img2=[UIImageimageNamed:@"2.JPG"];

   UIImage *img3=[UIImageimageNamed:@"3.JPG"];

   _imgview.animationImages=[NSArrayarrayWithObjects:img1,img2,img3,img2, nil];

    _imgview.animationDuration=0.6;

    [_imgviewstartAnimating];//动画开始

    //停止[_imgviewstopAnimating];